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• avcodec/mpeg12dec : Remove write-only assignments

  8 juillet 2024, par Andreas Rheinhardt

  avcodec/mpeg12dec : Remove write-only assignments
  This decoder unquantizes while parsing blocks
  
  and does not use dct_unquantize_mpeg1_intra
  
  (which uses *_dc_scale) at all.
  repeat_field was unused since
  
  e0a3d744a0d5a9a25fb85c9bba17e3b07d3ba29b.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpeg12dec.c

• avformat/mxfenc : Write color metadata to MXF

  6 août 2020, par Harry Mallon

  avformat/mxfenc : Write color metadata to MXF
  Writes color_primaries, color_trc and color_space to mxf
  
  headers. ULs are from https://registry.smpte-ra.org/ site.
  Signed-off-by : Harry Mallon <harry.mallon@codex.online>
  

  • [DH] libavformat/mxfenc.c

• How to write to fifo in while loop and read in continuous process

  18 avril 2019, par Russ_ell

  I’m running 3 multiprocess while loops that each write to seperate fifo’s , that are read by a continuously running ffmpeg process. This runs for the first loop of each process then stops.

  The code below is one of the write loops ( the other two are pretty much the same ), and the read process.

  def dubv():
  
      while True:
  
        print('loop')
  
        file, dur = getFile('vocal')
  
        fx = (
  
            AudioEffectsChain()
  
            .delay()
  
        )
  
        songvfx = fx(file)
  
        with open('/tmp/pipe2.fifo', 'wb') as p1:
  
            print('open s fifo')
  
            p1.write(songvfx.T.tobytes())
  
            p1.close()
  
            print('close s fifo')
  
        del songvfx
  
  
  
  def mixer():
  
      command4 = [
  
          'ffmpeg',
  
          '-nostdin',
  
          '-re',
  
          '-y',
  
          '-thread_queue_size', '4096',
  
          '-ac', '2',
  
          '-ar', '44100',
  
          '-f', 'f32le',
  
          '-i', '/tmp/pipe1.fifo',
  
          '-thread_queue_size', '4096',
  
          '-ac', '2',
  
          '-ar', '44100',
  
          '-f', 'f32le',
  
          '-i', '/tmp/pipe2.fifo',
  
          '-thread_queue_size', '4096',
  
          '-ac', '2',
  
          '-ar', '44100',
  
          '-f', 'f32le',
  
          '-i', '/tmp/pipe3.fifo',
  
          '-filter_complex', '[0][1][2]amix=inputs=3:dropout_transition=3[map]',
  
          '-map', '[map]',
  
          '-c:a', 'libmp3lame',
  
          '-b:a', '320k',
  
          '-f', 'mp3',
  
          'icecast://source:hackme@localhost:8000/test'
  
      ]
  
      o = open('/tmp/pipe1.fifo', 'rb')
  
      o2 = open('/tmp/pipe2.fifo', 'rb')
  
      o3 = open('/tmp/pipe3.fifo', 'rb')
  
      mix = sp.Popen(command4, stdin=DEVNULL, bufsize=4096)
  
      mix.wait()

  I’d like the write process to write to fifo2 , then loop and continue writing to fifo2 , to be read in the mixer process continuously.

  EDIT :

  I think the problem is coming from the reader closing as the loop runs once , then runs round the loop , open the fifo but never prints ’close s fifo’ again , so i presume it cant write to the file ?

  EDIT 2 :

  I have resolved this by moving the fifo close out of the loop. My writer is now

  def dubv():
  
    with open('/tmp/pipe2.fifo', 'wb') as p2:
  
      while True:
  
        print('loop')
  
        file, dur = getFile('vocal')
  
        fx = (
  
            AudioEffectsChain()
  
            .delay()
  
        )
  
        songvfx = fx(file)
  
        p2.write(songvfx.T.tobytes())
  
        del songvfx
  
        time.sleep(2)
  
    p2.close()
  
    print('close s fifo')

  and the reader doesn’t open the fifo files as ffmpeg seems to deal with this.

  def mixer():
  
    command4 = [
  
        'ffmpeg',
  
        '-re',
  
        '-y',
  
        '-thread_queue_size', '4096',
  
        '-ac', '2',
  
        '-ar', '44100',
  
        '-f', 'f32le',
  
        '-i', '/tmp/pipe1.fifo',
  
        '-thread_queue_size', '4096',
  
        '-ac', '2',
  
        '-ar', '44100',
  
        '-f', 'f32le',
  
        '-i', '/tmp/pipe2.fifo',
  
        '-thread_queue_size', '4096',
  
        '-ac', '2',
  
        '-ar', '44100',
  
        '-f', 'f32le',
  
        '-i', '/tmp/pipe3.fifo',
  
        '-filter_complex', '[0][1][2]amix=inputs=3:dropout_transition=3[map]',
  
        '-map', '[map]',
  
        '-c:a', 'libmp3lame',
  
        '-b:a', '320k',
  
        '-f', 'mp3',
  
        'icecast://source:hackme@localhost:8000/test'
  
    ]
  
    mix = sp.Popen(command4, stdin=DEVNULL, bufsize=4096)
  
    mix.wait()

  If anybody see a ’better’ solution please comment.

  Thank you