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• When rTorrent finishes, run FFmpeg and convert audio track in mkv to ac-3 5.1

  11 septembre 2021, par miniHessel

  What is the best approach for this ? I saw the following answer, is that still a valid approach ? If so, how do you execute that when a torrent finishes ? I mostly want to convert dts-hd either 5.1 or 7.1. Sometimes also Atmos.

  


• x264 Downsides of a high CRF (22) intermediary codec between conversions instead of lossless

  18 décembre 2019, par bobtheencoder

  I have a huge collection of video files that are in the range of CRF 16-20 taking up TB’s of space. The only need I have for these originals is that I have to encode them from time to time but the CRF of these final encodes is very low (CRF 26-28).

  I understand that a lossy to lossy converstion ALWAYS results in some quality loss but my question is what if the intermediate file is almost visually lossless compared to the final output.

  So to sum up, what quality difference should I expect from the following routes ?

  CRF 18 (original) -----> CRF 28 (final)
  
  CRF 18 (original) -----> CRF 22 (long-term storage) -----> Lossy  CRF 28 (final)

• Issue in FFmpegAndroid library when i compress video it convert video time into 1 or 2 second

  25 mai 2017, par Fateh Singh Saini

  Used this dependencies :
  compile ’com.writingminds:FFmpegAndroid:0.3.2’

  I used blow code for video compress
  public static final String VIDEOCODEC = "-vcodec" ;
  public static final String AUDIOCODEC = "-acodec" ;

  public static final String VIDEOBITSTREAMFILTER = "-vbsf";
  
  public static final String AUDIOBITSTREAMFILTER = "-absf";
  
  
  
  public static final String VERBOSITY = "-v";
  
  public static final String FILE_INPUT = "-i";
  
  public static final String SIZE = "-s";
  
  public static final String FRAMERATE = "-r";
  
  public static final String FORMAT = "-f";
  
  public static final String BITRATE_VIDEO = "-b:v";
  
  
  
  public static final String BITRATE_AUDIO = "-b:a";
  
  public static final String CHANNELS_AUDIO = "-ac";
  
  public static final String FREQ_AUDIO = "-ar";

  String[] complexCommand = "-y", FILE_INPUT, yourRealPath, SIZE, "480x360", FRAMERATE, "25", VIDEOCODEC, "mpeg4", BITRATE_VIDEO, "150k", BITRATE_AUDIO, "48000", CHANNELS_AUDIO, "2", FREQ_AUDIO, "22050", filePath ;

  /**
  
   * Executing ffmpeg binary
  
   */
  
  private static String execFFmpegBinary(final String[] command) {
  
  
  
  
  
      try {
  
          ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
              @Override
  
              public void onFailure(String s) {
  
                  Log.d(TAG, "FAILED with output : " + s);
  
              }
  
  
  
              @Override
  
              public void onSuccess(String s) {
  
                  Log.d(TAG, "SUCCESS with output : " + s);
  
              }
  
  
  
              @Override
  
              public void onProgress(String s) {
  
                  Log.d(TAG, "Started command : ffmpeg " + command);
  
                  Log.d(TAG, "progress : " + s);
  
              }
  
  
  
              @Override
  
              public void onStart() {
  
                  Log.d(TAG, "Started command : ffmpeg " + command);
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
                  Log.d(TAG, "Finished command : ffmpeg " + command);
  
  
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          // do nothing for now
  
      }
  
      return filePath;
  
  }