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• H264 keyframe issue with RTP

  3 septembre 2015, par Mat DePasquale

  I’m building an RTP encoder for H264 video. The video data provider doesn’t periodically stream the keyframe in the data, instead they have provided me with a binary file representation of the keyframe. This includes the SPS-PPS-SEI and then 8 slices of the i-frame.

  Since I am encoding RTP, I need to rebroadcast this keyframe at 2 second intervals. I am doing that in my code, along with the rest of the data as it comes in. I am using ffmpeg to connect to the RTP data via a UDP socket for display testing.

  I am noticing that every 2 seconds, the video seems to blank and resync itself, pixelate, etc. Obviously, this is highly undesirable in the video product. I’ve been trying to debug this for quite some time and the only thing I can determine is that it has to do with the keyframe. If I just send the keyframe once, and then the rest of the data, ffmpeg displays the video fine. But in a network environment, I need to send the keyframe at periodic intervals.

  Does anyone have an idea as to why this resyncing of the video happens and most importantly, how to stop it from happening ?

  Thanks !

• LIVE555 RTSP H.264 Raw Video File Stream - ffplay Errors

  22 octobre 2015, par Chris.

  I am streaming a raw .h264 video file via RTSP using LIVE555.

  To receive the stream I am using ffplay. However, when watching the video I notice bad video quality and a bunch of errors in the ffplay-console :

  Input #0, rtsp, from 'rtsp://xx.xx.xxx.x/stream': sq=    0B f=0/0
  
    Metadata:
  
      title           : stream
  
      comment         : stream
  
  Duration: N/A, start: 0.099989, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuv420p(tv, smpte170m/smpte170m/bt470m), 16
  
  80x1050 [SAR 1:1 DAR 8:5], 60 fps, 60 tbr, 90k tbn, 120 tbc
  
  [h264 @ 03f92100] RTP: missed 46 packetsq=   28KB sq=    0B f=1/1
  
  [h264 @ 03f92100] RTP: missed 74 packetsq=   23KB sq=    0B f=1/1
  
  [h264 @ 03f92100] RTP: missed 43 packets
  
  [h264 @ 03f92100] RTP: missed 35 packetsq=  179KB sq=    0B f=1/1
  
  [h264 @ 05710640] left block unavailable for requested intra4x4 mode -1 at 0 38
  
  [h264 @ 05710640] error while decoding MB 0 38, bytestream 48108
  
  [h264 @ 05710640] Cannot use next picture in error concealment
  
  [h264 @ 05710640] concealing 2989 DC, 2989 AC, 2989 MV errors in P frame
  
  [h264 @ 051043c0] left block unavailable for requested intra4x4 mode -1 at 0 26
  
  [h264 @ 051043c0] error while decoding MB 0 26, bytestream 5894
  
  [h264 @ 051043c0] concealing 4249 DC, 4249 AC, 4249 MV errors in I frame
  
  [h264 @ 03f92100] RTP: missed 68 packetsq=   28KB sq=    0B f=1/1
  
  [h264 @ 03f92100] RTP: missed 31 packetsq=  153KB sq=    0B f=1/1
  
  [h264 @ 052a0020] concealing 3292 DC, 3292 AC, 3292 MV errors in I frame
  
  [h264 @ 052a0020] Cannot use next picture in error concealment1/1
  
  [h264 @ 052a0020] concealing 2190 DC, 2190 AC, 2190 MV errors in P frame
  
  [h264 @ 03f92100] RTP: missed 69 packetsq=   27KB sq=    0B f=1/1
  
  [h264 @ 052a0020] concealing 3732 DC, 3732 AC, 3732 MV errors in I frame
  
  [h264 @ 03f92100] RTP: missed 26 packetsq=   30KB sq=    0B f=1/1
  
  ...

  How can I determine what’s wrong here ? Either with the stream or the file ?

• where is this wrong in ffmpeg installation and php configuration

  23 juillet 2015, par sonam Sharma

  hello all i have successfully installed ffmpeg to my computer i can check it by checking ffmpeg-version it returns something logical.

  which means the ffmpeg is running successfully on my pac but when i run this code by php i get error in ffmpeg loading

  <?php
  
   extension_loaded('ffmpeg') or die('Error in loading ffmpeg'); 
  
   // Determine the full path for our video
  
    $vid = realpath('./test/Sample.mp4');
  
  
  
   // Create the ffmpeg instance and then display the information about the video clip.
  
   $ffmpegInstance = new ffmpeg_movie($vid);
  
   echo "getDuration: " . $ffmpegInstance->getDuration() . "<br />".
  
    "getFrameCount: " . $ffmpegInstance->getFrameCount() . "<br />".
  
     "getFrameRate: " . $ffmpegInstance->getFrameRate() . "<br />".
  
     "getFilename: " . $ffmpegInstance->getFilename() . "<br />".
  
      "getComment: " . $ffmpegInstance->getComment() . "<br />".
  
     "getTitle: " . $ffmpegInstance->getTitle() . "<br />".
  
     "getAuthor: " . $ffmpegInstance->getAuthor() . "<br />".
  
          "getCopyright: " . $ffmpegInstance->getCopyright() . "<br />".
  
       "getArtist: " . $ffmpegInstance->getArtist() . "<br />".
  
       "getGenre: " . $ffmpegInstance->getGenre() . "<br />".
  
       "getTrackNumber: " . $ffmpegInstance->getTrackNumber() . "<br />".
  
      "getYear: " . $ffmpegInstance->getYear() . "<br />".
  
    "getFrameHeight: " . $ffmpegInstance->getFrameHeight() . "<br />". 
  
       "getAudioChannels: " . $ffmpegInstance->getAudioChannels() . "<br />".
  
     "hasAudio: " . $ffmpegInstance->hasAudio();
  
        ?>

  please tell me where i am doing wrong