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• Getting garbled frames when exporting video to image sequence in FFMPEG

  28 janvier 2018, par film_guy01

  I’m very new to FFMPEG to go easy on me.

  So I’ve just started playing around with ffmpeg but I’m getting some promising results. But I keep getting images like this : https://i.imgur.com/wIMkVoV.jpg which is not what that image it supposed to look like (in case you were uncertain).

  here’s been my command line code :

  ffmpeg -i inputfile.mkv -q:v 1 -r 0.20 outputfile_%04d.jpg

  My input file is a .h264 compressed ultra high definition video saved as .mkv format.

  I’ll get error messages like this :

  [h264 @ 0x7fbccd84ce00] co located POCs unavailable
  
  [h264 @ 0x7fbccd81e200] error while decoding MB 45 61, bytestream -17 drop=406 speed=1.71x    
  
  [h264 @ 0x7fbccd81e200] concealing 17764 DC, 17764 AC, 17764 MV errors in P frame
  
  [h264 @ 0x7fbccd84ce00] co located POCs unavailable
  
  [h264 @ 0x7fbccd814400] reference picture missing during reorder
  
  [h264 @ 0x7fbccd814400] Missing reference picture, default is 65986
  
  [h264 @ 0x7fbccd814400] error while decoding MB 71 100, bytestream -26drop=598 speed=1.79x    
  
  [h264 @ 0x7fbccd814400] concealing 8378 DC, 8378 AC, 8378 MV errors in B frame
  
  [h264 @ 0x7fbccd81dc00] co located POCs unavailable
  
  [h264 @ 0x7fbccd81e200] co located POCs unavailable
  
  [h264 @ 0x7fbccd863200] co located POCs unavailable
  
  [h264 @ 0x7fbccd814400] error while decoding MB 43 116, bytestream -5 drop=710 speed=1.81x   

  Sometimes I get these errors as well, but I’m not sure they’re related.

  [h264 @ 0x7fbcce004c00] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  [swscaler @ 0x7fbccf0c8000] deprecated pixel format used, make sure you did set range correctly

  Any idea how to fix this problem and get ffmpeg to export the images cleanly ? This would be HUGE if I could figure out how to get this working.

  Thanks !

• Real time audio streaming from ffmpeg to browser (am I missing something ?)

  19 septembre 2022, par Яктенс Тид

  I have tried a couple of solutions already, but nothing works for me.
I want to stream audio from my PC to another computer with almost zero latency. Things are working fine so far in a sense of lagging and everything, sound is clear and not choppy at all, but there is something like a delay between the moment when audio starts playing on my PC and remote PC. For example when I click on Youtube 'play' button audio starts playing only after 3-4 seconds on the remote machine. The same when I click 'Pause', the sound on the remote PC stops after a couple of seconds.

  


  I've tried to use websockets\plain audio tag, but no luck so far.

  


  For example this is my solution by using websockets and pipes :

  


  def create_pipe():
    return win32pipe.CreateNamedPipe(r'\\.\pipe\__audio_ffmpeg', win32pipe.PIPE_ACCESS_INBOUND,
                                     win32pipe.PIPE_TYPE_MESSAGE |
                                     win32pipe.PIPE_READMODE_MESSAGE |
                                     win32pipe.PIPE_WAIT, 1, 1024 * 8, 1024 * 8, 0, None)


async def echo(websocket):
    pipe = create_pipe()
    win32pipe.ConnectNamedPipe(pipe, None)
    while True:
        data = win32file.ReadFile(pipe, 1024 * 2)
        await websocket.send(data[1])


async def main():
    async with websockets.serve(echo, "0.0.0.0", 7777):
        await asyncio.Future()  # run forever


if __name__ == '__main__':
    asyncio.run(main())


  


  The way I start ffmpeg

  


  .\ffmpeg.exe -f dshow -i audio="Stereo Mix (Realtek High Definition Audio)" -acodec libmp3lame  -ab 320k -f mp3 -probesize 32 -muxdelay 0.01 -y \\.\pipe\__audio_ffmpeg


  


  On the JS side the code is a little bit long, but essentially I am just reading a web socket and appending to buffer

  


  this.buffer = this.mediaSource.addSourceBuffer('audio/mpeg')


  


  Also as you see I tried to use -probesize 32 -muxdelay 0.01 flags, but no luck as well

  


  I tried to use plain tag as well, but still - this couple-of-seconds delay exists

  


  What can I do ? Am I missing something ? Maybe I have to disable buffering somewhere ?

  


• checkasm/swscale : fix function prototypes

  3 juillet, par Kacper Michajłow

  checkasm/swscale : fix function prototypes
  This aligns declared function types in checkasm with real definition.
  Fixes FATE : checkasm-sw_rgb,sw_scale,sw_yuv2rgb,sw_yuv2yuv
  Fixes : runtime error : call to function <func> through pointer to incorrect function type
  
  Fixes : c1a0e657638f7007dcc807a2d985c22631fcd6d3
  Signed-off-by : Kacper Michajłow <kasper93@gmail.com>
  

  • [DH] tests/checkasm/sw_rgb.c
  • [DH] tests/checkasm/sw_scale.c
  • [DH] tests/checkasm/sw_yuv2rgb.c
  • [DH] tests/checkasm/sw_yuv2yuv.c