/*
    * Licensed to The Apereo Foundation under one or more contributor license
    * agreements. See the NOTICE file distributed with this work for additional
    * information regarding copyright ownership.
    *
    *
    * The Apereo Foundation licenses this file to you under the Educational
    * Community License, Version 2.0 (the "License"); you may not use this file
    * except in compliance with the License. You may obtain a copy of the License
   * at:
   *
   *   http://opensource.org/licenses/ecl2.txt
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations under
   * the License.
   *
   */
  
  
  package org.opencastproject.composer.impl;
  
  import org.opencastproject.composer.api.EncoderException;
  import org.opencastproject.composer.api.EncodingProfile;
  import org.opencastproject.composer.api.VideoClip;
  import org.opencastproject.mediapackage.AdaptivePlaylist;
  import org.opencastproject.mediapackage.identifier.IdImpl;
  import org.opencastproject.util.IoSupport;
  
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.io.FilenameUtils;
  import org.apache.commons.lang3.StringUtils;
  import org.codehaus.plexus.util.cli.CommandLineUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.InputStreamReader;
  import java.text.DecimalFormat;
  import java.text.DecimalFormatSymbols;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Set;
  import java.util.UUID;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import javax.activation.MimetypesFileTypeMap;
  
  /**
   * Abstract base class for encoder engines.
   */
  public class EncoderEngine implements AutoCloseable {
  
    /** The ffmpeg commandline suffix */
    static final String CMD_SUFFIX = "ffmpeg.command";
    static final String ADAPTIVE_TYPE_SUFFIX = "adaptive.type"; // HLS only
    /** The trimming start time property name */
    static final String PROP_TRIMMING_START_TIME = "trim.start";
    /** The trimming duration property name */
    static final String PROP_TRIMMING_DURATION = "trim.duration";
    /** If true STDERR and STDOUT of the spawned process will be mixed so that both can be read via STDIN */
    private static final boolean REDIRECT_ERROR_STREAM = true;
  
    private static Logger logger = LoggerFactory.getLogger(EncoderEngine.class);
    /** the encoder binary */
    private String binary = "ffmpeg";
    /** Set of processes to clean up */
    private Set<Process> processes = new HashSet<>();
  
    private final Pattern outputPattern = Pattern.compile("Output .* (\\S+) to '(.*)':");
    // ffmpeg4 generates HLS output files and may use a .tmp suffix while writing
    private final Pattern outputPatternHLS = Pattern.compile("Opening '([^']+)\\.tmp'|([^']+)' for writing");
  
    // These are common video options that may be mapped in HLS streams. This will help catch some common mistakes
    private static List<String> mappableOptions = Stream.of("-bf", "-b_strategy", "-bitrate", "-bufsize", "-crf",
           "-f", "-flags", "-force_key_frames", "-g", "-level", "-keyint", "-keyint_min", "-maxrate", "-minrate",
           "-pix_fmt", "-preset", "-profile",
           "-r", "-refs", "-s", "-sc_threshold", "-tune", "-x264opts", "-x264-params")
           .collect(Collectors.toList());
  
    /**
     * Creates a new abstract encoder engine with or without support for multiple job submission.
     */
    EncoderEngine(String binary) {
      this.binary = binary;
   }
 
   /**
    * {@inheritDoc}
    *
    * @see EncoderEngine#encode(File, EncodingProfile, Map)
    */
   File encode(File mediaSource, EncodingProfile format, Map<String, String> properties)
           throws EncoderException {
     List<File> output = process(Collections.singletonMap("video", mediaSource), format, properties);
     if (output.size() != 1) {
       throw new EncoderException(String.format("Encode expects one output file (%s found)", output.size()));
     }
     return output.get(0);
   }
 
   /**
    * Extract several images from a video file.
    *
    * @param mediaSource
    *          File to extract images from
    * @param format
    *          Encoding profile to use for extraction
    * @param properties
    * @param times
    *          Times at which to extract the images
    * @return  List of image files
    * @throws EncoderException Something went wrong during image extraction
    */
   List<File> extract(File mediaSource, EncodingProfile format, Map<String, String> properties, double... times)
           throws EncoderException {
 
     List<File> extractedImages = new LinkedList<>();
     try {
       // Extract one image if no times are specified
       if (times.length == 0) {
         extractedImages.add(encode(mediaSource, format, properties));
       }
       for (double time : times) {
         Map<String, String> params = new HashMap<>();
         if (properties != null) {
           params.putAll(properties);
         }
 
         DecimalFormatSymbols ffmpegFormat = new DecimalFormatSymbols();
         ffmpegFormat.setDecimalSeparator('.');
         DecimalFormat df = new DecimalFormat("0.00000", ffmpegFormat);
         params.put("time", df.format(time));
 
         extractedImages.add(encode(mediaSource, format, params));
       }
     } catch (Exception e) {
       cleanup(extractedImages);
       if (e instanceof EncoderException) {
         throw (EncoderException) e;
       } else {
         throw new EncoderException("Image extraction failed", e);
       }
     }
 
     return extractedImages;
   }
 
   /**
    * Executes the command line encoder with the given set of files and properties and using the provided encoding
    * profile.
    *
    * @param source
    *          the source files for encoding
    * @param profile
    *          the profile identifier
    * @param properties
    *          the encoding properties to be interpreted by the actual encoder implementation
    * @return the processed file
    * @throws EncoderException
    *           if processing fails
    */
   List<File> process(Map<String, File> source, EncodingProfile profile, Map<String, String> properties)
           throws EncoderException {
     // Fist, update the parameters
     Map<String, String> params = new HashMap<>();
     if (properties != null)
       params.putAll(properties);
     // build command
     if (source.isEmpty()) {
       throw new IllegalArgumentException("At least one track must be specified.");
     }
     // Set encoding parameters
     for (Map.Entry<String, File> f: source.entrySet()) {
       final String input = FilenameUtils.normalize(f.getValue().getAbsolutePath());
       final String pre = "in." + f.getKey();
       params.put(pre + ".path", input);
       params.put(pre + ".name", FilenameUtils.getBaseName(input));
       params.put(pre + ".suffix", FilenameUtils.getExtension(input));
       params.put(pre + ".filename", FilenameUtils.getName(input));
       params.put(pre + ".mimetype", MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType(input));
     }
     final File parentFile = source.getOrDefault("video", source.getOrDefault("audio",
         source.values().stream().findFirst().get()));
 
     final String outDir = parentFile.getAbsoluteFile().getParent();
     final String outFileName = FilenameUtils.getBaseName(parentFile.getName())
             + "_" + UUID.randomUUID().toString();
     params.put("out.dir", outDir);
     params.put("out.name", outFileName);
     if (profile.getSuffix() != null) {
       final String outSuffix = processParameters(profile.getSuffix(), params);
       params.put("out.suffix", outSuffix);
     }
 
     for (String tag : profile.getTags()) {
       final String suffix = processParameters(profile.getSuffix(tag), params);
       params.put("out.suffix." + tag, suffix);
     }
 
     // create encoder process.
     final List<String> command = buildCommand(profile, params);
     logger.info("Executing encoding command: {}", command);
 
     List<File> outFiles = new ArrayList<>();
     BufferedReader in = null;
     Process encoderProcess = null;
     try {
       ProcessBuilder processBuilder = new ProcessBuilder(command);
       processBuilder.redirectErrorStream(REDIRECT_ERROR_STREAM);
       encoderProcess = processBuilder.start();
       processes.add(encoderProcess);
 
       // tell encoder listeners about output
       in = new BufferedReader(new InputStreamReader(encoderProcess.getInputStream()));
       String line;
       while ((line = in.readLine()) != null) {
         handleEncoderOutput(outFiles, line);
       }
 
       // wait until the task is finished
       int exitCode = encoderProcess.waitFor();
       if (exitCode != 0) {
         throw new EncoderException("Encoder exited abnormally with status " + exitCode);
       }
 
       logger.info("Tracks {} successfully encoded using profile '{}'", source, profile.getIdentifier());
       return outFiles;
     } catch (Exception e) {
       logger.warn("Error while encoding {}  using profile '{}'",
               source, profile.getIdentifier(), e);
 
       // Ensure temporary data are removed
       for (File outFile : outFiles) {
         if (FileUtils.deleteQuietly(outFile)) {
           logger.debug("Removed output file of failed encoding process: {}", outFile);
         }
       }
       throw new EncoderException(e);
     } finally {
       IoSupport.closeQuietly(in);
       IoSupport.closeQuietly(encoderProcess);
     }
   }
 
   /*
    * Runs the raw command string thru the encoder. The string commandopts is ffmpeg specific, it just needs the binary.
    * The calling function is responsible in doing all the appropriate substitutions using the encoding profiles,
    * creating the directory for storage, etc. Encoding profiles and input names are included here for logging and
    * returns
    *
    * @param commandopts - tokenized ffmpeg command
    *
    * @param inputs - input files in the command, used for reporting
    *
    * @param profiles - encoding profiles, used for reporting
    *
    * @return encoded - media as a result of running the command
    *
    * @throws EncoderException if it fails
    */
 
   protected List<File> process(List<String> commandopts) throws EncoderException {
     logger.trace("Process raw command -  {}", commandopts);
     // create encoder process. using working dir of the
     // current java process
     Process encoderProcess = null;
     BufferedReader in = null;
     List<File> outFiles = new ArrayList<>();
     try {
       List<String> command = new ArrayList<>();
       command.add(binary);
       command.addAll(commandopts);
       logger.info("Executing encoding command: {}", StringUtils.join(command, " "));
 
       ProcessBuilder pbuilder = new ProcessBuilder(command);
       pbuilder.redirectErrorStream(REDIRECT_ERROR_STREAM);
       encoderProcess = pbuilder.start();
       // tell encoder listeners about output
       in = new BufferedReader(new InputStreamReader(encoderProcess.getInputStream()));
       String line;
       while ((line = in.readLine()) != null) {
         handleEncoderOutput(outFiles, line); // get names of output files
       }
       // wait until the task is finished
       encoderProcess.waitFor();
       int exitCode = encoderProcess.exitValue();
       if (exitCode != 0) {
         throw new EncoderException("Encoder exited abnormally with status " + exitCode);
       }
       logger.info("Video track successfully encoded '{}'",
               new Object[] { StringUtils.join(commandopts, " ") });
       return outFiles; // return output as a list of files
     } catch (Exception e) {
       logger.warn("Error while encoding video tracks using '{}': {}",
               new Object[] {  StringUtils.join(commandopts, " "), e.getMessage() });
       // Ensure temporary data are removed
       for (File outFile : outFiles) {
         if (FileUtils.deleteQuietly(outFile)) {
           logger.debug("Removed output file of failed encoding process: {}", outFile);
         }
       }
       throw new EncoderException(e);
     } finally {
       IoSupport.closeQuietly(in);
       IoSupport.closeQuietly(encoderProcess);
     }
   }
 
   /**
    * Deletes all valid files found in a list
    *
    * @param outputFiles
    *          list containing files
    */
   private void cleanup(List<File> outputFiles) {
     for (File file : outputFiles) {
       if (file != null && file.isFile()) {
         String path = file.getAbsolutePath();
         if (file.delete()) {
           logger.info("Deleted file {}", path);
         } else {
           logger.warn("Could not delete file {}", path);
         }
       }
     }
   }
 
   /**
    * Creates the command that is sent to the commandline encoder.
    *
    * @return the commandline
    * @throws EncoderException
    *           in case of any error
    */
   private List<String> buildCommand(final EncodingProfile profile, final Map<String, String> argumentReplacements)
           throws EncoderException {
     List<String> command = new ArrayList<>();
     command.add(binary);
     command.add("-nostdin");
     command.add("-nostats");
 
     String commandline = profile.getExtension(CMD_SUFFIX);
 
     // Handle command line extensions before parsing:
     // Example:
     //   ffmpeg.command = #{concatCmd} -c copy out.mp4
     //   ffmpeg.command.concatCmd = -i ...
     for (String key: argumentReplacements.keySet()) {
       if (key.startsWith(CMD_SUFFIX + '.')) {
         final String shortKey = key.substring(CMD_SUFFIX.length() + 1);
         commandline = commandline.replace("#{" + shortKey + "}", argumentReplacements.get(key));
       }
     }
 
     String processedCommandLine = processParameters(commandline, argumentReplacements);
       try {
         command.addAll(Arrays.asList(CommandLineUtils.translateCommandline(processedCommandLine)));
       } catch (Exception e) {
         throw new EncoderException("Could not process encoding profile command line", e);
       }
     return command;
   }
 
   /**
    * {@inheritDoc}
    *
    * @see EncoderEngine#trim(File,
    *      EncodingProfile, long, long, Map)
    */
   File trim(File mediaSource, EncodingProfile format, long start, long duration, Map<String, String> properties) throws EncoderException {
     if (properties == null)
       properties = new HashMap<>();
     double startD = (double) start / 1000;
     double durationD = (double) duration / 1000;
     DecimalFormatSymbols ffmpegFormat = new DecimalFormatSymbols();
     ffmpegFormat.setDecimalSeparator('.');
     DecimalFormat df = new DecimalFormat("00.00000", ffmpegFormat);
     properties.put(PROP_TRIMMING_START_TIME, df.format(startD));
     properties.put(PROP_TRIMMING_DURATION, df.format(durationD));
     return encode(mediaSource, format, properties);
   }
 
   /**
    * Processes the command options by replacing the templates with their actual values.
    *
    * @return the commandline
    */
   private String processParameters(String cmd, final Map<String, String> args) {
     // multi level templates handling
     String cmdBefore = null;
     while (!cmd.equals(cmdBefore)) {
       cmdBefore = cmd;
       for (Map.Entry<String, String> e : args.entrySet()) {
         cmd = cmd.replace("#{" + e.getKey() + "}", e.getValue());
       }
     }
 
     // Also replace spaces
     cmd = cmd.replace("#{space}", " ");
 
     /* Remove unused commandline parts */
     return cmd.replaceAll("#\\{.*?\\}", "");
   }
 
   @Override
   public void close() {
     for (Process process: processes) {
       if (process.isAlive()) {
         logger.debug("Destroying encoding process {}", process);
         process.destroy();
       }
     }
   }
 
   /**
    * Handles the encoder output by analyzing it first and then firing it off to the registered listeners.
    * Has provisions to deal with HLS outputs which uses templates
    *
    * @param message
    *          the message returned by the encoder
    */
   private void handleEncoderOutput(List<File> output, String message) {
     message = message.trim();
     if ("".equals(message))
       return;
 
     // Others go to trace logging
     if (StringUtils.startsWithAny(message.toLowerCase(),
           "ffmpeg version", "configuration", "lib", "size=", "frame=", "built with")) {
       logger.trace(message);
 
     // Handle output files
     } else if (StringUtils.startsWith(message, "Output #")) {
       logger.debug(message);
       Matcher matcher = outputPattern.matcher(message);
       if (matcher.find()) {
         String type = matcher.group(1);
         String outputPath = matcher.group(2);
         if (!StringUtils.equals("NUL", outputPath) && !StringUtils.equals("/dev/null", outputPath)
                 && !StringUtils.equals("/dev/null", outputPath)
                 && !StringUtils.startsWith("pipe:", outputPath)) {
           File outputFile = new File(outputPath);
           if (!type.startsWith("hls")) {
             logger.info("Identified output file {}", outputFile);
             output.add(outputFile);
           }
         }
       }
     } else if (StringUtils.startsWith(message, "[hls @ ")) {
       logger.debug(message);
       Matcher matcher = outputPatternHLS.matcher(message);
       if (matcher.find()) {
         final String outputPath = Objects.toString(matcher.group(1), matcher.group(2));
         if (!StringUtils.equals("NUL", outputPath) && !StringUtils.equals("/dev/null", outputPath)
                 && !StringUtils.startsWith("pipe:", outputPath)) {
           File outputFile = new File(outputPath);
           // HLS generates the filenames based on a template with %v and %d replaced
           // HLS writes into the same manifest file to add each segment
           if (!output.contains(outputFile)) {
             logger.info("Identified HLS output file {}", outputFile);
             output.add(outputFile);
           }
         }
       }
 
     // Some to debug
     } else if (StringUtils.startsWithAny(message.toLowerCase(),
           "artist", "compatible_brands", "copyright", "creation_time", "description", "composer", "date", "duration",
             "encoder", "handler_name", "input #", "last message repeated", "major_brand", "metadata", "minor_version",
             "output #", "program", "side data:", "stream #", "stream mapping", "title", "video:", "[libx264 @ ", "Press [")) {
       logger.debug(message);
 
     // And the rest is likely to deserve at least info
     } else {
       logger.info(message);
     }
   }
 
   /**
    * Splits a line into tokens - mindful of single and double quoted string as single token Apache common and guava do
    * not deal with quotes
    *
    * @param str
    * @return an array of string tokens
    */
   public List<String> commandSplit(String str) {
     ArrayList<String> al = new ArrayList<String>();
     final Pattern regex = Pattern.compile("\"([^\"]*)\"|\'([^\']*)\'|\\S+");
     Matcher m = regex.matcher(str);
     while (m.find()) {
       if (m.group(1) != null) {
         // double-quoted string without the quotes
         al.add(m.group(1));
       } else if (m.group(2) != null) {
         // single-quoted string without the quotes
         al.add(m.group(2));
       } else {
         // Add unquoted word
         al.add(m.group());
       }
     }
     return (al);
   }
 
   /**
    * Use a separator to join a string entry only if it is not null or empty
    *
    * @param srlist
    *          -array of string
    * @param separator
    *          - to join the string
    * @return a string
    */
   public String joinNonNullString(String[] srlist, String separator) {
     StringBuffer sb = new StringBuffer();
     for (int i = 0; i < srlist.length; i++) {
       if (srlist[i] == null || srlist[i].isEmpty())
         continue;
       else {
         if (sb.length() > 0)
           sb.append(separator);
         sb.append(srlist[i]);
       }
     }
     return sb.toString();
   }
 
   /**
    * Rewrite multiple profiles to ffmpeg complex filter filtergraph chains - inputs are passed in as options, eq: [0aa]
    * and [0vv] Any filters in the encoding profiles are moved into a clause in the complex filter chain for each output
    */
   protected class OutputAggregate {
     private final List<EncodingProfile> pf;
     private final ArrayList<String> outputs = new ArrayList<>();
     private final ArrayList<String> outputFiles = new ArrayList<>();
     private final ArrayList<String> outputSuffixes = new ArrayList<>(); // for HLS
     private boolean hasAdaptiveProfile = false;
     private final ArrayList<String> vpads; // output pads for each segment
     private final ArrayList<String> apads;
     private final ArrayList<String> vfilter; // filters for each output format
     private final ArrayList<String> afilter;
     private String vInputPad = "";
     private String aInputPad = "";
     private String vsplit = "";
     private String asplit = "";
     private final ArrayList<String> vstream; // output video name
     private final ArrayList<String> astream; // output audio name
 
     public OutputAggregate(List<EncodingProfile> profiles,
             Map<String, String> params, String vInputPad, String aInputPad) throws EncoderException {
       ArrayList<EncodingProfile> deliveryProfiles = new ArrayList<EncodingProfile>(profiles.size());
       EncodingProfile groupProfile = null;
       for (EncodingProfile ep: profiles) {
         String adaptiveType = ep.getExtension(ADAPTIVE_TYPE_SUFFIX);
         if (adaptiveType == null) {
           deliveryProfiles.add(ep);
         } else {
           if ("HLS".equalsIgnoreCase(adaptiveType)) {
             groupProfile = ep;
             hasAdaptiveProfile = true;
           }
           else
             throw new EncoderException("Only HLS is supported" + ep.getIdentifier() + " ffmpeg command");
         }
       }
       this.pf = deliveryProfiles;
       int size = this.pf.size();
 
       if (vInputPad == null && aInputPad == null)
         throw new EncoderException("At least one of video or audio input must be specified");
       // Init
       vfilter = new ArrayList<>(Collections.nCopies(size, null));
       afilter = new ArrayList<>(Collections.nCopies(size, null));
       // name of output pads to map to files
       apads = new ArrayList<>(Collections.nCopies(size, null));
       vpads = new ArrayList<>(Collections.nCopies(size, null));
 
       vstream = new ArrayList<>(Collections.nCopies(size, null));
       astream = new ArrayList<>(Collections.nCopies(size, null));
 
       vsplit = (size > 1) ? (vInputPad + "split=" + size) : null; // number of splits
       asplit = (size > 1) ? (aInputPad + "asplit=" + size) : null;
       this.vInputPad = vInputPad;
       this.aInputPad = aInputPad;
       if (groupProfile != null)
         outputAggregateReal(deliveryProfiles, groupProfile, params, vInputPad, aInputPad);
       else
         outputAggregateReal(deliveryProfiles, params, vInputPad, aInputPad);
     }
 
 
     /*
      * set the audio filter if there are any in the profiles or identity
      */
     private void setAudioFilters() {
       if (pf.size() == 1) {
         if (afilter.get(0) != null)
           afilter.set(0, aInputPad + afilter.get(0) + apads.get(0)); // Use audio filter on input directly
           astream.set(0, apads.get(0));
       } else
         for (int i = 0; i < pf.size(); i++) {
           if (afilter.get(i) != null) {
             afilter.set(i, "[oa0" + i + "]" + afilter.get(i) + apads.get(i)); // Use audio filter on apad
             asplit += "[oa0" + i + "]";
             astream.set(i, "[oa0" + i + "]");
           } else {
             asplit += apads.get(i); // straight to output
             astream.set(i, apads.get(i));
           }
         }
       afilter.removeAll(Arrays.asList((String) null));
     }
 
     /*
      * set the video filter if there are any in the profiles
      */
     private void setVideoFilters() {
       if (pf.size() == 1) {
         if (vfilter.get(0) != null)
           vfilter.set(0, vInputPad + vfilter.get(0) + vpads.get(0)); // send to filter first
           vstream.set(0, vpads.get(0));
       } else
         for (int i = 0; i < pf.size(); i++) {
           if (vfilter.get(i) != null) {
             vfilter.set(i, "[ov0" + i + "]" + vfilter.get(i) + vpads.get(i)); // send to filter first
             vsplit += "[ov0" + i + "]";
             vstream.set(i, "[ov0" + i + "]");
           } else {
             vsplit += vpads.get(i);// straight to output
             vstream.set(i, vpads.get(i));
           }
         }
 
       vfilter.removeAll(Arrays.asList((String) null));
     }
 
     public List<String> getOutFiles() {
       return outputFiles;
     }
 
     /**
      *
      * @return output pads - the "-map xyz" clauses
      */
     public List<String> getOutput() {
       return outputs;
     }
 
     /**
      * Get the profile suffixes with source file string interpolation done
      *
      * @return the suffixes iff adaptive, otherwise empty
      */
     public List<String> getSegmentOutputSuffixes() {
       return outputSuffixes;
     }
 
     /**
      * Check for adaptive playlist output - output may need remapping
      *
      * @return if true
      */
     public boolean hasAdaptivePlaylist() {
       return hasAdaptiveProfile;
     }
 
     /**
      *
      * @return filter split clause for ffmpeg
      */
     public String getVsplit() {
       return vsplit;
     }
 
     public String getAsplit() {
       return asplit;
     }
 
     public String getVideoFilter() {
       if (vfilter.isEmpty())
         return null;
       return StringUtils.join(vfilter, ";");
     }
 
     public String getAudioFilter() {
       if (afilter.isEmpty())
         return null;
       return StringUtils.join(afilter, ";");
     }
 
     /**
      * If this is a raw mapping not used with complex filter, strip the square brackets if there are any
      *
      * @param pad
      *          - such as 0:a, [0:v], [1:1],[0:12],[main],[overlay]
      * @return adjusted pad
      */
     public String adjustForNoComplexFilter(String pad) {
       final Pattern outpad = Pattern.compile("\\[(\\d+:[av\\d{1,2}])\\]");
       try {
         Matcher matcher = outpad.matcher(pad); // throws exception if pad is null
         if (matcher.matches()) {
           return matcher.group(1);
         }
       } catch (Exception e) {
       }
       return pad;
     }
 
     /**
      * Replace all the templates with real values for each profile
      *
      * @param cmd
      *          from profile
      * @param params
      *          from input
      * @return command
      */
     protected String processParameters(String cmd, Map<String, String> params) {
       String r = cmd;
       for (Map.Entry<String, String> e : params.entrySet()) {
         r = r.replace("#{" + e.getKey() + "}", e.getValue());
       }
       return r;
     }
 
     /**
      * Translate the profiles to work with complex filter clauses in ffmpeg, it splits one output into multiple, one for
      * each encoding profile. This also generates the manifests for HLS using the group profile (HLS only). Each
      * encoding profile must have a bitrate or one will be generated for all the profiles.
      * This requires ffmpeg version later than 4.1
      *
      * @param profiles
      *          - list of encoding profiles
      * @param groupProfile
      *          - encoding profile that applies to all output and has precedence, currently only HLS options
      * @param params
      *          - values for substitution
      * @param vInputPad
      *          - name of video pad as input, eg: [0v] null if no video
      * @param aInputPad
      *          - name of audio pad as input, eg [0a], null if no audio
      * @throws EncoderException
      *           - if it fails
      */
     public void outputAggregateReal(List<EncodingProfile> profiles, EncodingProfile groupProfile,
             Map<String, String> params, String vInputPad, String aInputPad) throws EncoderException {
       int size = profiles.size();
 
       // substitute the output file suffix for group
       try {
         String outSuffix = processParameters(groupProfile.getSuffix(), params);
         params.put("out.suffix", outSuffix); // Add profile suffix
       } catch (Exception e) {
         throw new EncoderException("Missing Encoding Profiles");
       }
       String ffmpgGCmd = groupProfile.getExtension(CMD_SUFFIX); // Get ffmpeg command from profile
 
       if (ffmpgGCmd == null)
         throw new EncoderException("Missing ffmpeg Encoding Profile " + groupProfile.getIdentifier() + " ffmpeg command");
       for (Map.Entry<String, String> e : params.entrySet()) { // replace output filenames
         ffmpgGCmd = ffmpgGCmd.replace("#{" + e.getKey() + "}", e.getValue());
       }
       ffmpgGCmd = ffmpgGCmd.replace("#{space}", " ");
       int indx = 0; // individual quality profiles - names are not needed anymore
       // Only quality(bitrate/resolution/etc) and position matters
       for (EncodingProfile profile : profiles) {
         String cmd = "";
         // substitute the output file name
         outputSuffixes.add(processParameters(profile.getSuffix(), params)); // preferred suffixes
         String ffmpgCmd = profile.getExtension(CMD_SUFFIX); // Get ffmpeg command from profile
         if (ffmpgCmd == null)
           throw new EncoderException("Missing Encoding Profile " + profile.getIdentifier() + " ffmpeg command");
         // Leave this so they will be removed
         params.remove("out.dir");
         params.remove("out.name");
         params.remove("out.suffix");
         for (Map.Entry<String, String> e : params.entrySet()) { // replace output filenames
           ffmpgCmd = ffmpgCmd.replace("#{" + e.getKey() + "}", e.getValue());
         }
         ffmpgCmd = ffmpgCmd.replace("#{space}", " ");
         List<String> cmdToken;
         try {
           cmdToken = commandSplit(ffmpgCmd);
         } catch (Exception e) {
           throw new EncoderException("Could not parse encoding profile command line", e);
         }
         //List<String> cmdToken = Arrays.asList(arguments);
         for (int i = 0; i < cmdToken.size(); i++) {
           if (cmdToken.get(i).contains("#{out.name}")) {
             if (i == cmdToken.size() - 1) { // last item, most likely
               cmdToken = cmdToken.subList(0, i);
               break;
             } else { // in the middle of the list
               List<String> copy = cmdToken.subList(0, i - 1);
               copy.addAll(cmdToken.subList(i + 1, cmdToken.size() - 1));
               cmdToken = copy;
             }
           }
         }
         // Find and remove input and filters from ffmpeg command from the profile
         int i = 0;
         String maxrate = null;
         while (i < cmdToken.size()) {
           String opt = cmdToken.get(i);
           if (opt.startsWith("-vf") || opt.startsWith("-filter:v")) { // video filters
             vfilter.set(indx, cmdToken.get(i + 1).replace("\"", "")); // store without quotes
             i++;
           } else if (opt.startsWith("-filter_complex") || opt.startsWith("-lavfi")) { // safer to quit now than to
             // baffle users with strange errors later
             i++;
             logger.error("Command does not support complex filters - only simple -af or -vf filters are supported");
             throw new EncoderException(
                     "Cannot parse complex filters in" + profile.getIdentifier() + " for this operation");
           } else if (opt.startsWith("-af") || opt.startsWith("-filter:a")) { // audio filter
             afilter.set(indx, cmdToken.get(i + 1).replace("\"", "")); // store without quotes
             i++;
           } else if ("-i".equals(opt)) {
             i++; // inputs are now mapped, remove from command
           } else if (opt.startsWith("-c:") || opt.startsWith("-codec:") || opt.contains("-vcodec")
                   || opt.contains("-acodec")) { // cannot copy codec in complex filter
             String str = cmdToken.get(i + 1);
             if (str.contains("copy")) // c
               i++;
             else if (opt.startsWith("-codec:") || opt.contains("-vcodec")) { // becomes -c:v
               cmd = cmd + " " + adjustABRVMaps("-c:v", indx);
             }
             else if (opt.startsWith("-acodec:"))
               cmd = cmd + " " + adjustABRVMaps("-c:a", indx);
             else
               cmd = cmd + " " + adjustABRVMaps(opt, indx);
           } else { // keep the rest
             cmd = cmd + " " + adjustABRVMaps(opt, indx);
           }
           i++;
         }
 
         /* Remove unused commandline parts */
         cmd = cmd.replaceAll("#\\{.*?\\}", "");
         // Find the output map based on splits and filters
         if (size == 1) { // no split
           if (afilter.get(indx) == null)
             apads.set(indx, adjustForNoComplexFilter(aInputPad));
           else
             apads.set(indx, "[oa" + indx + "]");
           if (vfilter.get(indx) == null)
             vpads.set(indx, adjustForNoComplexFilter(vInputPad)); // No split, no filter - straight from input
           else
             vpads.set(indx, "[ov" + indx + "]");
 
         } else { // split
           vpads.set(indx, "[ov" + indx + "]"); // name the output pads from split -> input to final format
           apads.set(indx, "[oa" + indx + "]"); // name the output audio pads
         }
         cmd = StringUtils.trimToNull(cmd); // remove all leading/trailing white spaces
         if (cmd != null) {
           // No direct output from encoding profile
           // outputFiles.add(cmdToken.get(cmdToken.size() - 1));
           if (vInputPad != null) {
             outputs.add("-map " + vpads.get(indx));
           }
           if (aInputPad != null) {
             outputs.add("-map " + apads.get(indx)); // map video and audio input
           }
           outputs.add(cmd); // profiles appended in order, they are numbered 0,1,2,3...
           indx++; // indx for this profile
         }
       }
       setVideoFilters();
       setAudioFilters();
       setHLSVarStreamMap(ffmpgGCmd, vInputPad != null, aInputPad != null); // Only HLS is supported so far
     }
 
     /**
      * Sets the mapping of outputs to HLS streams.
      *
      * @param ffmpgCmd
      *          - ffmpeg command with substitution from the encoding profile
      * @param hasVideo
      *          - use video stream
      * @param hasAudio
      *          - use audio stream
      */
     private void setHLSVarStreamMap(String ffmpgCmd, boolean hasVideo, boolean hasAudio) {
       StringBuilder varStreamMap = new StringBuilder();
       varStreamMap.append(" -var_stream_map '");
 
       for (int i = 0; i < pf.size(); i++) {
         int j = 0;
         String[] maps = new String[2];
         if (hasVideo && vstream.get(i) != null) { // Has video
           maps[j] = "v:" + i;
           ++j;
         }
         if (hasAudio && astream.get(i) != null) { // Has audio
           maps[j] = "a:" + i;
         }
         // each target delivery is v:i,a:i
         varStreamMap.append(joinNonNullString(maps, ","));
         varStreamMap.append(" ");
       }
 
       varStreamMap.append("' ");
       varStreamMap.append(ffmpgCmd);
       varStreamMap.append(" ");
       outputs.add(varStreamMap.toString()); // treat as another output
     }
 
     /**
      * When the inputs are routed to ABR, some options need to have a v:int suffix for video and a:0 for audio Any
      * options ending with ":v" will get a number, otherwise try and guess use option:(v or a) notables (eg: b:v, c:v),
      * options such as ab or vb will not work
      *
      * @param option
      *          - ffmpeg option
      * @param position
      *          - position in the command
      */
     public String adjustABRVMaps(String option, int position) {
       if (option.endsWith(":v") || option.endsWith(":a")) {
         return option + ":" + Integer.toString(position);
       } else if (mappableOptions.contains(option)) {
         return option + ":v:" + Integer.toString(position);
       } else
         return option;
     }
 
 
     /**
      * Translate the profiles to work with complex filter clauses in ffmpeg, it splits one output into multiple, one for
      * each encoding profile
      *
      * @param profiles
      *          - list of encoding profiles
      * @param params
      *          - values for substitution
      * @param vInputPad
      *          - name of video pad as input, eg: [0v] null if no video
      * @param aInputPad
      *          - name of audio pad as input, eg [0a], null if no audio
      * @throws EncoderException
      *           - if it fails
      */
     public void outputAggregateReal(List<EncodingProfile> profiles, Map<String, String> params,
               String vInputPad, String aInputPad) throws EncoderException {
 
       int size = profiles.size();
       int indx = 0; // profiles
       for (EncodingProfile profile : profiles) {
         String cmd = "";
         String outSuffix;
         // generate random name as we only have one base name
         String outFileName = params.get("out.name.base") + "_" + IdImpl.fromUUID().toString();
         params.put("out.name", outFileName); // Output file name for this profile
         try {
           outSuffix = processParameters(profile.getSuffix(), params);
           params.put("out.suffix", outSuffix); // Add profile suffix
         } catch (Exception e) {
           throw new EncoderException("Missing Encoding Profiles");
         }
         // substitute the output file name
         String ffmpgCmd = profile.getExtension(CMD_SUFFIX); // Get ffmpeg command from profile
         if (ffmpgCmd == null)
           throw new EncoderException("Missing Encoding Profile " + profile.getIdentifier() + " ffmpeg command");
         for (Map.Entry<String, String> e : params.entrySet()) { // replace output filenames
           ffmpgCmd = ffmpgCmd.replace("#{" + e.getKey() + "}", e.getValue());
         }
         ffmpgCmd = ffmpgCmd.replace("#{space}", " ");
         String[] arguments;
         try {
           arguments = CommandLineUtils.translateCommandline(ffmpgCmd);
         } catch (Exception e) {
           throw new EncoderException("Could not parse encoding profile command line", e);
         }
         List<String> cmdToken = Arrays.asList(arguments);
         // Find and remove input and filters from ffmpeg command from the profile
         int i = 0;
         while (i < cmdToken.size()) {
           String opt = cmdToken.get(i);
           if (opt.startsWith("-vf") || opt.startsWith("-filter:v")) { // video filters
             vfilter.set(indx, cmdToken.get(i + 1).replace("\"", "")); // store without quotes
             i++;
           } else if (opt.startsWith("-filter_complex") || opt.startsWith("-lavfi")) { // safer to quit now than to
             // baffle users with strange errors later
             i++;
             logger.error("Command does not support complex filters - only simple -af or -vf filters are supported");
             throw new EncoderException(
                     "Cannot parse complex filters in" + profile.getIdentifier() + " for this operation");
           } else if (opt.startsWith("-af") || opt.startsWith("-filter:a")) { // audio filter
             afilter.set(indx, cmdToken.get(i + 1).replace("\"", "")); // store without quotes
             i++;
           } else if ("-i".equals(opt)) {
             i++; // inputs are now mapped, remove from command
           } else if (opt.startsWith("-c:") || opt.startsWith("-codec:") || opt.contains("-vcodec")
                   || opt.contains("-acodec")) { // cannot copy codec in complex filter
             String str = cmdToken.get(i + 1);
             if (str.contains("copy")) // c
               i++;
             else
               cmd = cmd + " " + opt;
           } else { // keep the rest
             cmd = cmd + " " + opt;
           }
           i++;
         }
         /* Remove unused commandline parts */
         cmd = cmd.replaceAll("#\\{.*?\\}", "");
         // Find the output map based on splits and filters
         if (size == 1) { // no split
           if (afilter.get(indx) == null)
             apads.set(indx, adjustForNoComplexFilter(aInputPad));
           else
             apads.set(indx, "[oa" + indx + "]");
           if (vfilter.get(indx) == null)
             vpads.set(indx, adjustForNoComplexFilter(vInputPad)); // No split, no filter - straight from input
           else
             vpads.set(indx, "[ov" + indx + "]");
 
         } else { // split
           vpads.set(indx, "[ov" + indx + "]"); // name the output pads from split -> input to final format
           apads.set(indx, "[oa" + indx + "]"); // name the output audio pads
         }
         cmd = StringUtils.trimToNull(cmd); // remove all leading/trailing white spaces
         if (cmd != null) {
           outputFiles.add(cmdToken.get(cmdToken.size() - 1));
           if (vInputPad != null) {
             outputs.add("-map " + vpads.get(indx));
           }
           if (aInputPad != null) {
             outputs.add("-map " + apads.get(indx)); // map video and audio input
           }
           outputs.add(cmd); // profiles appended in order, they are numbered 0,1,2,3...
           indx++; // indx for this profile
         }
       }
       setVideoFilters();
       setAudioFilters();
     }
   }
 
   /**
    * Clean up the edit points, make sure the gap between consecutive segments are larger than the transition Otherwise
    * it can be very slow to run and output will be ugly because the fades will extend the clip
    *
    * @param edits
    *          - clips to be stitched together
    * @param gap
    *          = transitionDuration / 1000; default gap size - same as fade
    * @return a list of sanitized video clips
    */
   private static List<VideoClip> sortSegments(List<VideoClip> edits, double gap) {
     LinkedList<VideoClip> ll = new LinkedList<VideoClip>();
     Iterator<VideoClip> it = edits.iterator();
     VideoClip clip;
     VideoClip nextclip;
     int lastSrc = -1;
     while (it.hasNext()) { // Skip sort if there are multiple sources
       clip = it.next();
       if (lastSrc < 0) {
         lastSrc = clip.getSrc();
       } else if (lastSrc != clip.getSrc()) {
         return edits;
       }
     }
     Collections.sort(edits); // Sort clips if all clips are from the same src
     List<VideoClip> clips = new ArrayList<VideoClip>();
     it = edits.iterator();
     while (it.hasNext()) { // Check for legal durations
       clip = it.next();
       if (clip.getDuration() > gap) { // Keep segments at least as long as transition fade
         ll.add(clip);
       }
     }
     clip = ll.pop(); // initialize
     // Clean up segments so that the cut out is at least as long as the transition gap (default is fade out-fade in)
     while (!ll.isEmpty()) { // Check that 2 consecutive segments from same src are at least GAP secs apart
       if (ll.peek() != null) {
         nextclip = ll.pop(); // check next consecutive segment
         if ((nextclip.getSrc() == clip.getSrc()) && (nextclip.getStart() - clip.getEnd()) < gap) { // collapse two
           // segments into one
           clip.setEnd(nextclip.getEnd()); // by using inpt of seg 1 and outpoint of seg 2
         } else {
           clips.add(clip); // keep last segment
           clip = nextclip; // check next segment
         }
       }
     }
     clips.add(clip); // add last segment
     return clips;
   }
 
   /**
    * Create the trim part of the complex filter and return the clauses for the complex filter. The transition is fade to
    * black then fade from black. The outputs are mapped to [ov] and [oa]
    *
    * @param clips
    *          - video segments as indices into the media files by time
    * @param transitionDuration
    *          - length of transition in MS between each segment
    * @param hasVideo
    *          - has video, from inspection
    * @param hasAudio
    *          - has audio
    * @return complex filter clauses to do editing for ffmpeg
    * @throws Exception
    *           - if it fails
    */
   private List<String> makeEdits(List<VideoClip> clips, int transitionDuration, Boolean hasVideo,
           Boolean hasAudio) throws Exception {
     double vfade = transitionDuration / 1000; // video and audio have the same transition duration
     double afade = vfade;
     DecimalFormatSymbols ffmpegFormat = new DecimalFormatSymbols();
     ffmpegFormat.setDecimalSeparator('.');
     DecimalFormat f = new DecimalFormat("0.00", ffmpegFormat);
     List<String> vpads = new ArrayList<>();
     List<String> apads = new ArrayList<>();
     List<String> clauses = new ArrayList<>(); // The clauses are ordered
     int n = 0;
     if (clips != null)
       n = clips.size();
     String outmap = "o";
     if (n > 1) { // Create the input pads if we have multiple segments
       for (int i = 0; i < n; i++) {
         vpads.add("[v" + i + "]"); // post filter
         apads.add("[a" + i + "]");
       }
       outmap = "";
       // Create the trims
       for (int i = 0; i < n; i++) { // Each clip
         // get clip and add fades to each clip
         VideoClip vclip = clips.get(i);
         int fileindx = vclip.getSrc(); // get source file by index
         double inpt = vclip.getStart(); // get in points
         double duration = vclip.getDuration();
         double vend = Math.max(duration - vfade, 0);
         double aend = Math.max(duration - afade, 0);
         if (hasVideo) {
           String vvclip;
           vvclip = "[" + fileindx + ":v]trim=" + f.format(inpt) + ":duration=" + f.format(duration)
                   + ",setpts=PTS-STARTPTS"
                   + ((vfade > 0) ? ",fade=t=in:st=0:d=" + vfade + ",fade=t=out:st=" + f.format(vend) + ":d=" + vfade
                           : "")
                   + "[" + outmap + "v" + i + "]";
           clauses.add(vvclip);
         }
         if (hasAudio) {
           String aclip;
           aclip = "[" + fileindx + ":a]atrim=" + f.format(inpt) + ":duration=" + f.format(duration)
                   + ",asetpts=PTS-STARTPTS"
                   + ((afade > 0)
                           ? ",afade=t=in:st=0:d=" + afade + ",afade=t=out:st=" + f.format(aend) + ":d=" + afade
                           : "")
                   + "[" + outmap + "a" + i + "]";
           clauses.add(aclip);
         }
       }
       // use unsafe because different files may have different SAR/framerate
       if (hasVideo)
         clauses.add(StringUtils.join(vpads, "") + "concat=n=" + n + ":unsafe=1[ov]"); // concat video clips
       if (hasAudio)
         clauses.add(StringUtils.join(apads, "") + "concat=n=" + n + ":v=0:a=1[oa]"); // concat audio clips in stream 0,
     } else if (n == 1) { // single segment
       VideoClip vclip = clips.get(0);
       int fileindx = vclip.getSrc(); // get source file by index
       double inpt = vclip.getStart(); // get in points
       double duration = vclip.getDuration();
       double vend = Math.max(duration - vfade, 0);
       double aend = Math.max(duration - afade, 0);
 
       if (hasVideo) {
         String vvclip;
 
         vvclip = "[" + fileindx + ":v]trim=" + f.format(inpt) + ":duration=" + f.format(duration)
                 + ",setpts=PTS-STARTPTS"
                 + ((vfade > 0) ? ",fade=t=in:st=0:d=" + vfade + ",fade=t=out:st=" + f.format(vend) + ":d=" + vfade : "")
                 + "[ov]";
 
         clauses.add(vvclip);
       }
       if (hasAudio) {
         String aclip;
         aclip = "[" + fileindx + ":a]atrim=" + f.format(inpt) + ":duration=" + f.format(duration)
                 + ",asetpts=PTS-STARTPTS"
                 + ((afade > 0) ? ",afade=t=in:st=0:d=" + afade + ",afade=t=out:st=" + f.format(aend) + ":d=" + afade
                         : "")
                 + "[oa]";
 
         clauses.add(aclip);
       }
     }
     return clauses; // if no edits, there are no clauses
   }
 
   private Map<String, String> getParamsFromFile(File parentFile) {
     Map<String, String> params = new HashMap<>();
     String videoInput = FilenameUtils.normalize(parentFile.getAbsolutePath());
     params.put("in.video.path", videoInput);
     params.put("in.video.name", FilenameUtils.getBaseName(videoInput));
     params.put("in.name", FilenameUtils.getBaseName(videoInput)); // One of the names
     params.put("in.video.suffix", FilenameUtils.getExtension(videoInput));
     params.put("in.video.filename", FilenameUtils.getName(videoInput));
     params.put("in.video.mimetype", MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType(videoInput));
     String outDir = parentFile.getAbsoluteFile().getParent(); // Use first file dir
     params.put("out.dir", outDir);
     String outFileName = FilenameUtils.getBaseName(parentFile.getName());
     params.put("out.name.base", outFileName); // Base file name used
     params.put("out.name", outFileName); // file name used - may be replaced
     return params;
   }
 
   /**
    * Concatenate segments of one or more input tracks specified by trim points into the track the edits are passed in as
    * double so that it is generic. The tracks are assumed to have the same resolution.
    *
    * @param inputs
    *          - input tracks as a list of files
    * @param edits
    *          - edits are a flat list of triplets, each triplet represent one clip: index (int) into input tracks, trim in point(long)
    *          in milliseconds and trim out point (long) in milliseconds for each segment
    * @param profiles
    *          - encoding profiles for each delivery target - [optional] one adaptive profile to apply to the outputs to
    *          generate manifests/playlists
    * @param transitionDuration
    *          in ms, transition time between each edited segment
    * @throws EncoderException
    *           - if it fails
    */
   public List<File> multiTrimConcat(List<File> inputs, List<Long> edits, List<EncodingProfile> profiles,
           int transitionDuration) throws EncoderException {
     return multiTrimConcat(inputs, edits, profiles, transitionDuration, true, true);
 
   }
 
   public List<File> multiTrimConcat(List<File> inputs, List<Long> edits, List<EncodingProfile> profiles,
           int transitionDuration, boolean hasVideo, boolean hasAudio)
           throws EncoderException, IllegalArgumentException {
     if (inputs == null || inputs.size() < 1) {
       throw new IllegalArgumentException("At least one track must be specified.");
     }
     if (edits == null && inputs.size() > 1) {
       throw new IllegalArgumentException("If there is no editing, only one track can be specified.");
     }
     List<VideoClip> clips = null;
     if (edits != null) {
       clips = new ArrayList<VideoClip>(edits.size() / 3);
       int adjust = 0;
       // When the first clip starts at 0, and there is a fade, lip sync can be off,
       // this adjustment will mitigate the problem
       for (int i = 0; i < edits.size(); i += 3) {
         if (edits.get(i + 1) < transitionDuration) // If taken from the beginning of video
           adjust = transitionDuration / 2000; // add half the fade duration in seconds
         else
           adjust = 0;
         clips.add(new VideoClip(edits.get(i).intValue(), (double) edits.get(i + 1) / 1000 + adjust,
               (double) edits.get(i + 2) / 1000));
       }
       try {
         clips = sortSegments(clips, transitionDuration / 1000); // remove bad edit points
       } catch (Exception e) {
         logger.error("Illegal edits, cannot sort segment", e);
       throw new EncoderException("Cannot understand the edit points", e);
       }
     }
     // Set encoding parameters
     Map<String, String> params = null;
     if (inputs.size() > 0) { // Shared parameters - the rest are profile specific
       params = getParamsFromFile(inputs.get(0));
     }
     if (profiles == null || profiles.size() == 0) {
       logger.error("Missing encoding profiles");
       throw new EncoderException("Missing encoding profile(s)");
     }
     try {
       List<String> command = new ArrayList<>();
       List<String> clauses = makeEdits(clips, transitionDuration, hasVideo, hasAudio); // map inputs into [ov]
                                                                                                // and [oa]
       // Entry point for multiencode here, if edits is empty, then use raw channels instead of output from edits
       String videoOut = (clips == null) ? "[0:v]" : "[ov]";
       String audioOut = (clips == null) ? "[0:a]" : "[oa]";
       OutputAggregate outmaps = new OutputAggregate(profiles, params, (hasVideo ? videoOut : null),
               (hasAudio ? audioOut : null)); // map outputs from ov and oa
       if (hasAudio) {
         clauses.add(outmaps.getAsplit());
         clauses.add(outmaps.getAudioFilter());
       }
       if (hasVideo) {
         clauses.add(outmaps.getVsplit());
         clauses.add(outmaps.getVideoFilter());
       }
       clauses.removeIf(Objects::isNull); // remove all empty filters
       command.add("-nostats"); // no progress report
       command.add("-hide_banner"); // no configuration/library info
       for (File o : inputs) {
         command.add("-i"); // Add inputfile in the order of entry
         command.add(o.getCanonicalPath());
       }
       if (!clauses.isEmpty()) {
         command.add("-filter_complex");
         command.add(StringUtils.join(clauses, ";"));
       }
       for (String outpad : outmaps.getOutput()) {
         command.addAll(commandSplit(outpad)); // split by space
       }
       if (outmaps.hasAdaptivePlaylist()) {
         List<File> results = process(command); // Run the ffmpeg command
         // Sort list of segmented mp4s because the output segments are numbered
         List<File> segments = results.stream().filter(AdaptivePlaylist.isHLSFilePred.negate())
                 .collect(Collectors.toList());
         segments.sort((File f1, File f2) -> f1.getName().compareTo(f2.getName()));
         List<String> suffixes = outmaps.getSegmentOutputSuffixes();
         HashMap<File, File> renames = new HashMap<File, File>();
         results.forEach((f) -> {
           renames.put(f, f); // init
         });
         for (int i = 0; i < segments.size(); i++) {
           File file = segments.get(i);
           // Construct a new name with old name (unique within this group) and profile suffix
           String newname = FilenameUtils.concat(file.getParent(),
                   FilenameUtils.getBaseName(file.getName()) + suffixes.get(i));
           renames.put(file, new File(newname)); // only segments change names
         }
         // Adjust the playlists to use new names
         return AdaptivePlaylist.hlsRenameAllFiles(results, renames);
       }
       return process(command); // Run the ffmpeg command and return outputs
     } catch (Exception e) {
       logger.error("MultiTrimConcat failed to run command {} ", e.getMessage());
       throw new EncoderException("Cannot encode the inputs",e);
     }
   }
 
 }