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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.

• FFmpeg/MP4 - Force all existing frames to play at fixed frame rate

  16 mai 2020, par MJoseph

  I have an MP4 video file that I suspect is corrupt, in that mediainfo reports a variable frame rate, but I believe the frames present are meant to be played at a fixed frame rate. This discrepancy causes video stuttering. Is there any way to force an MP4 container (by editing header info, or frame timing tables) to simply play back all existing frames at a fixed frame rate (i.e. 24fps). Every tip I've read assumes you want to drop and/or add frames to achieve a new frame rate, while keeping all the old frame timings (i.e. ffmpeg -r or ffmpeg -filter). These methods end up preserving the stutter and altering the size of the file. I would like to throw out the frame timings, but keep all frames, and just play them back at a constant rate. Is this possible ?

  


• How to convert MPEG2-TTS to MPEG2-TS format to playback using ffplay

  29 février 2024, par Asustor

  I know some OSS such as ffmpeg or gstreamer don't support to play-back MPEG2-TTS stream.
Then, I tried to convert 192 bytes TTS packet to 188 bytes TS packet by deleting first 4 bytes like :

  


  def conv_tts2ts(rtp_payload):

    payload_len = len(rtp_payload)
    if payload_len % 192 != 0:
        raise

    pkt_num = int(payload_len / 192)
    ts_data = bytearray()
    for i in range(pkt_num):
        spos = 192 * i
        epos = spos + 192
        tmp = rtp_payload[spos:epos]
        ts_data.extend(tmp[4:])

    return ts_data

# after this, send ts_data with RTP header received from MPEG2-TTS streamer via UDP/IP.



  


  However, ffplay and ffprobe don't reaction.

  


  I expect to be able to play-back using ffplay as MPEG2-TS format.
Please tell me how to convert TTS to TS in order to deocde by ffmpeg ?