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• when audioqueue play lpcm decoded from ffmpeg, the elapsed time of audio queue exceeds the duraion of the media

  15 août 2012, par zhzhy

  When play the lpcm data decoded from ffmpeg with audioqueue, the elapsed time got by AudioQueueGetCurrentTime exceeds the duration of media. But when decode the same media with AVFoundation framework, the elapsed time equals duration of the media, and so when read media by ffmpeg with no decoded, then send the compressed media data to audioqueue, the elapsed time also equals duration of the media. The AudioStreamBasicDescription set as following :

      asbd.mSampleRate = 44100;
  
      asbd.mFormatID = kAudioFormatLinearPCM;
  
      asbd.mFormatFlags = kAudioFormatFlagsCanonical;
  
      asbd.mBytesPerPacket = 4;
  
      asbd.mFramesPerPacket = 1;
  
      asbd.mBytesPerFrame = 4;
  
      asbd.mChannelsPerFrame = 2;
  
      asbd.mBitsPerChannel = 16;
  
      asbd.mReserved = 0;

  When playing with data decoded from AVFoundation, the setting of AudioStreamBasicDescription is the same as above. By my test found that AudioTimeStamp.mSampleTime got by AudioQueueGetCurrentTime is different between ffmpeg and AVFoundation, the value of ffmpeg is greater than AVFoundation. So I want to know how this happen, and how to fix it ?
  Thanks !

• pyglet_ffmpeg loads and plays video in script(.py) but not loading(media load) in executable

  24 février 2020, par Mahesh Dilip Salvi

  i am playing full screen video in pyglet application which just plays video as follows, the script(.py) file loads mp4 video(as mediaload) and plays it well (windowed/fullscreen) but after making it executable with pyinstaller command (pyinstaller -w -F .\videoPlay.py) it is not loading media.
  *i identified it with ’try-except’ block with help of ctypes.MessageBox
  Please assist me by checking following thing.

  import pyglet, pyglet_ffmpeg
  
  
  
  pyglet_ffmpeg.load_ffmpeg()
  
  
  
  vidPath = 'm2Vid.mp4'
  
  
  
  window = pyglet.window.Window() #fullscreen=True
  
  player = pyglet.media.Player()
  
  source = pyglet.media.StreamingSource()
  
  MediaLoad = pyglet.media.load(vidPath)
  
  player.on_player_eos = window.close
  
  
  
  player.queue(MediaLoad)
  
  player.play()
  
  
  
  @window.event
  
  def on_draw():
  
      if player.source and player.source.video_format:
  
          player.get_texture().blit(0,0)
  
  
  
  pyglet.app.run()

• How to use hardware decoding of media files using ffmpeg android ?

  22 août 2012, par Anoop AR.

  i am developing a media player application in android which uses ffmpeg for decoding which i think is software decoding. it doesn't play high resolution videos smoothly so i would like to switch to hardware decoding. I came to know that libstagefright will do the thing. But how to implement it using libstagefright ? Is there any samples or documentation . Please help in using the libstagefright.