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• What's the most elegant way to get the language codes from an MKV file with multiple audio tracks ?

  30 janvier 2017, par WackGet

  I need a way to get the language codes from MKV files which have multiple audio tracks.

  ffmpeg produces output which I could then filter using regular expressions but it doesn’t seem very elegant :

  $ ffmpeg -i file.mkv 2>&1 | grep Audio
  
  Stream #0:1(eng): Audio: mp2, 48000 Hz, stereo, s16, 192 kb/s (default)
  
  Stream #0:2(nar): Audio: mp2, 48000 Hz, mono, s16, 64 kb/s (default)

  mediainfo has the ability to extract language information but in files with multiple tracks, it concatenates the codes into a single string :

  $ mediainfo file.mkv --inform="Audio;%Language%"  
  
  ennar

  Is there a tool or command which will return language codes for multiple tracks in a nicer way, or a tool which would let me specify a track number and return the language code for that track only ?

• How to get language for embedded subtitles in video file using FFMPEG libraries

  18 septembre 2024, par helgovic

  I have seen lots of examples on how to get the language codes using the command line interface, but how do you get them using the libraries ?

  


• Trim video length in Android with javacv and ffmpeg

  11 juillet 2017, par Morya Yaroslav

  I’m trying to trim video length with ffmpeg implementation of FrameGrabber and FrameRecorder, but getting corrupted file of smaller size then it’s going to be. Maybe there is other way to trim video from start time to end time, also updating trim progress. Seems like it’s not recording changes between frames. Maybe there are some other ways to trim videos of different formats like mp4, flv and others. Here is code snippet :

          FrameGrabber grabber = new FFmpegFrameGrabber(mClip.getPath());
  
          grabber.start();
  
          grabber.setTimestamp(mClip.getClipStartMs()); // Write from specific moment
  
  
  
          File out = new File(mClip.getOutPutPath(params[0])); // Set destination to write
  
          FrameRecorder recorder = new FFmpegFrameRecorder(out, grabber.getImageWidth(), grabber.getImageHeight());
  
  
  
  
  
          recorder.setFormat(grabber.getFormat());
  
          recorder.setFrameRate(grabber.getFrameRate());
  
          recorder.setSampleRate(grabber.getSampleRate());
  
          recorder.setAspectRatio(grabber.getAspectRatio());
  
          recorder.setSampleFormat(grabber.getSampleFormat());
  
  
  
          recorder.setAudioCodec(grabber.getAudioCodec());
  
          recorder.setAudioBitrate(grabber.getAudioBitrate());
  
          recorder.setAudioChannels(grabber.getAudioChannels());
  
  
  
          recorder.setVideoCodec(grabber.getVideoCodec());
  
          recorder.setVideoBitrate(grabber.getVideoBitrate());
  
  
  
          recorder.start();
  
  
  
          Frame frame;
  
          Long timestamp;
  
          Long fullLength = mClip.getClipEndMs() - mClip.getClipStartMs();
  
          double percent = 0d, oldPercent = 0d;
  
  
  
          while ((frame = grabber.grabFrame()) != null && (timestamp = grabber.getTimestamp()) <= mClip.getClipEndMs()) {
  
              Log.d(ASYNC_SAVE_TAG, "Started command : ffmpeg " + mClip.toString());
  
  
  
              if (timestamp != 0d) {
  
                  oldPercent = percent;
  
                  percent = timestamp.doubleValue() / fullLength.doubleValue();
  
                  if (MathUtil.compare(percent, oldPercent) != 0) {
  
                      publishProgress(percent);
  
                  }
  
              }
  
  
  
              recorder.setTimestamp(grabber.getTimestamp() - mClip.getClipStartMs());
  
              recorder.record(frame);
  
          }
  
  
  
          grabber.close();
  
          recorder.close();