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• FFMPEGH264Decoder - h264 video playing too fast

  25 février 2017, par Vineesh TP

  I am trying to play a .h264 video in iOS
  When loading the video the play back is too fast.

  I am reffering this source code

  Here is the code,

   CFFMPEGH264Decoder *decoder = new CFFMPEGH264Decoder(0);
  
      decoder->Init();
  
      decoder->Start();
  
      dispatch_queue_t decodeQueue = dispatch_queue_create("abc", NULL);
  
      dispatch_async(decodeQueue, ^{
  
          VideoPacket *vp = nil;
  
          while(true) {
  
              vp = [parser nextPacket];
  
              if(vp == nil) {
  
                  break;
  
              }
  
              decoder->Decode(vp.buffer, vp.size);
  
              unsigned char *result = decoder->GetResultData();
  
              if (result != 0) {
  
                //  NSLog(@"%d, %d",decoder->GetResultWidth(), decoder->GetResultHeight());
  
                  dispatch_async(dispatch_get_main_queue(), ^{
  
  
  
                    [glView displayYUV420pData:result width:decoder->GetResultWidth() height:decoder->GetResultHeight()];
  
                  });
  
  
  
                  decoder->ReleaseResultData();
  
              }
  
          }
  
      });

  When Encode the video I have to the frameRate is 24 only.
  But, after decode 5 second video play back is plying in 1 second.

• Android and ffmpeg. Play video (with sound)

  18 février 2014, par bukka.wh

  I have compiled ffmpeg library add it to my project and now I want to play video (with full list of options - stop, pause, forward, backward etc). I have read roman10 ffmpeg tutorial. And I also find out tutorial which describes how play video with ffmpeg and SDL framework. The difference (if I have correctly understood) is that in roman's tutorial each frame of video turns into a Bitmap and is then passed to Java code where it shows on SurfaceView. And in the second tutorial, the video is playing with the help of the SDL framework without passing it back to Java code.

  I want to ask some questions :

  1. Which way is better : return Bitmap back to Java and show it on SurfaceView or play it with SDL ?
  2. How can I play the sound of my video (can I do it with ffmpeg or do I need some additional libraries) ?

• mpeg-2 ts video audio skipping - HTTP Live Streaming

  15 août 2012, par Kami Shangool

  I have multiple mp4 streams that I take and convert into mpeg-2 ts format using ffmpeg

  ffmpeg -i 0.mp4 -vcodec libx264 -sameq -acodec libfaac -fflags +genpts -coder 0 -f mpegts 0.ts

  The mp4s range from 1 to n. After converting all of them, I create a manifest file similar to :

  #EXTM3U
  
  #EXT-X-TARGETDURATION:4
  
  #EXT-X-VERSION:4
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-PLAYLIST-TYPE:EVENT
  
  #EXTINF:4.000,
  
  http://localhost/Nick2/0.ts
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:3.97,
  
  http://localhost/Nick2/1.ts
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:3.97,
  
  http://localhost/Nick2/2.ts
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:3.97,
  
  http://localhost/Nick2/3.ts
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:3.97,
  
  http://localhost/Nick2/4.ts
  
  #EXT-X-ENDLIST

  I've added the #EXT-X-DISCONTINUITY since the I'm trying to get back to back playback of the converted mp4's. The problem is that if I try to use HTTP live streaming, there is a noticeable pop in the audio between files. But that isn't apparent if playing the segments in QT.
  Any thoughts on how I can fix this ?