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  • avcodec_decode_video2 takes long time to decode wmv

    22 février 2013, par Mike Versteeg

    I have written a player using the ffmpeg libraries that plays several avi, mp4 and mpg files fine but not wmv. Debugging has shown that the culprit is avcodec_decode_video2 which for some reason takes half a second to decode a single wmv frame. I have tested and confirmed this with multiple wmv files, even those with much lower resolution then other files that play successfully. Anyone has a clue what I'm doing wrong ?

    PS : log shows "Extra data : 8 bits left, value : 0" and "parser not found for codec wmav2, packets or times may be invalid." for WMV files.

    UPDATE :
    Further examination has shown the call to avcodec_decode_video2 is not slow, instead it seems to return the same frame some 16 times or so, giving the visual impression that it is slow. It does not return an error code so I have no clue why it won't decode all frames in the case of wmv.

    Relevant code :

      AVPacket packet;
    
  av_init_packet(&packet);
    
  done = pOwner->av_read_frame(pFormatCtx, &packet) < 0;
    
  if (!done && packet.stream_index==videostream) 
    
      bool error = pOwner->avcodec_decode_video2(pVCodecCtx, pFrameYUV, &finished, &packet) < 0;

  • Live Stream from FFMpeg Not playing on mobile [on hold]

    3 mai 2016, par Avishek Sharma

    The following piece of code plays the live stream on the browser but not on the mobile.

    ffmpeg -re -i input.mp4 -c:v copy -c:a copy -f flv "rtmp url"

  • Live Streaming to AMS using Ffmpeg not playing in mobile browser

    6 mai 2016, par Gaurav Bora

    I have installed Ffmpeg and am streaming a video to my adobe media server (Rtmp url) usinf Ffmpeg. The stream is playing in desktop browsers but not on mobile browsers. When I use OBS to stream to the same Rtmp url, it plays in both laptop and mobile browsers. The command that I use to stream using Ffmpeg and which is working in desktop browsers is

    ffmpeg -re -i samplefile.mp4 -c:v copy -c:a copy -f flv "rtmp url of my adobe media server/streamkey"

    TIA

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