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• Don't throw an error when attached picture isn't recognized.

  10 avril 2023, par Dale Curtis

  Don't throw an error when attached picture isn't recognized.
  The MIME type field is required per the FLAC standard, but it's
  
  not an error just because ffmpeg doesn't recognize it.
  Signed-off-by : Dale Curtis <dalecurtis@chromium.org>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/flac_picture.c

• torchaudio.io.StreamReader doesn't throw error when seeking to time stamp more than the duration of audio file

  27 mars 2023, par lokesh

  I am trying to get the audio chunk of audio file between specific start time and end time

  


  Consider a audio of duration 10 seconds. Now i need to get chunk from 4 sec to 7 sec

  


  torchaudio.info doesn't give correct num_frames for io.BytesIO flac audio file. So there is no way to find the total number of frames in the given audio to check for out of bounds start offset
Ref : https://github.com/pytorch/audio/issues/2524

  


  What I did to get the chunk of audio with start and end offsets.

  


  def read_audio(audio_file, start, end):
    audio_file.seek(0)
    reader = StreamReader(audio_file)
    sample_rate = int(reader.get_src_stream_info(reader.default_audio_stream).sample_rate)

    reader.seek(start * sample_rate)
    reader.add_basic_audio_stream(frames_per_chunk=(end - start) * sample_rate)

    return list(reader.stream())[0].pop()


  


  This is working as intended for start time less than the duration of audio file. But when we give the start time more than the duration of audio file, It doesn't throw error or return empty tensor.
Is there any way to know the given offsets are out of bounds.

  


• PHP-FFMpeg filters()->resize() throw Use of undefined constant RESIZEMODE_INSET

  27 février 2023, par Angus Simons

  I'm using PHP-FFMpeg to use FFMpeg with php, unfortunately I can't set resize filter.

  



  This is my code :

  



  $video = $ffmpeg->open('video.mov');

$dimension = new FFMpeg\Coordinate\Dimension(1920, 1080);
$video->filters()
      ->resize($dimension, RESIZEMODE_INSET, true, 1)
      ->synchronize();

$format = new FFMpeg\Format\Video\X264('aac', 'libx264');
$format->setAudioChannels(2)->setAudioKiloBitrate(256);
$video->save($format, 'video.mp4');


  



  But it throws this error :

  



  Use of undefined constant RESIZEMODE_INSET - assumed 'RESIZEMODE_INSET'

  



  I tried also :

  



  ->resize($dimension, 'RESIZEMODE_INSET', true, 1)

  



  and

  



  ->resize($dimension, 'inset', true, 1)

  



  But I can't get the video converted without stretching.

  



  Thanks in advance