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• ffmpeg player out of sync after seek

  9 juillet 2015, par sat

  I have a ffmpeg/SDL video player based on Dranger’s tutorial07 :
  https://github.com/illuusio/ffmpeg-tutorial/blob/master/tutorial07.c

  The image and the audio are not synchronized anymore, once seeked backwards. The image seems to be in the correct position unlike the audio. However, the video becomes synchronized subsequently being seeked forwards once.

  I trigger seeking in the main function’s loop by keypress :

  incr = -1.0; //seconds    
  
  if(global_video_state) {
  
      pos = get_master_clock(global_video_state);
  
      pos += incr;
  
      stream_seek(global_video_state, (int64_t)(pos * AV_TIME_BASE), incr);
  
  }

  Then stream_seek sets seek parameters of global structure :

  void stream_seek(VideoState *is, int64_t pos, int rel) {
  
      if(!is->seek_req) {
  
          is->seek_pos = pos;
  
          is->seek_flags = rel < 0 ? AVSEEK_FLAG_BACKWARD : 0;
  
          is->seek_req = 1;
  
      }
  
  }

  And here is the seek part of the decode_thread’s main loop :

  if(is->seek_req) {
  
      int stream_index = -1;
  
      int64_t seek_target = is->seek_pos;
  
  
  
      if(is->videoStream >= 0) {
  
          stream_index = is->videoStream;
  
  
  
      } else if(is->audioStream >= 0) {
  
          stream_index = is->audioStream;
  
      }
  
  
  
      if(stream_index >= 0) {
  
          seek_target = av_rescale_q(seek_target, AV_TIME_BASE_Q, pFormatCtx->streams[stream_index]->time_base);
  
      }
  
  
  
      if(av_seek_frame(is->pFormatCtx, stream_index, seek_target, is->seek_flags) < 0) {
  
          fprintf(stderr, "%s: error while seeking\n", is->pFormatCtx->filename);
  
  
  
      } else {
  
          if(is->audioStream >= 0) {
  
              packet_queue_flush(&is->audioq);
  
              packet_queue_put(&is->audioq, &flush_pkt);
  
          }
  
  
  
          if(is->videoStream >= 0) {
  
              packet_queue_flush(&is->videoq);
  
              packet_queue_put(&is->videoq, &flush_pkt);
  
          }
  
      }
  
  
  
      is->seek_req = 0;
  
  }

• How to make video (of any format) compatible to play in android's default player ?

  24 janvier 2014, par Aarti

  I want to play video urls from server in device's video player,but unable to play all videos
  Testing on HTC Desire (4.1.1), Panasonic (4.1.3), Samsung G S2(2.3.6).

  I've already gone through following links

  Sorry, this video cannot be played - streaming mp4 to android and
  How to Play Streaming Audio/Video from a url ?
  but did not found working solution.

  I understand few imp things from above,

  1. Video must be baseline H264 encoded for playing successfully on all devices
  2. For encoding any kind of video to H264, we need to integret ffmpeg

  My questions are,

  1. How exactly I can convert any format of video to H264 baseline support ? Examples are appreciated.
  2. Is there any alternate way for FFMPEG ?
  3. How can I check if video is baseline H.264 ?

  I have tried playing videos with both Intent ACTION_VIEW & MediaController, result was same for both.

  Its very urgent. Any kind of help or hint appreciated. Thank You.

• avformat/dashdec : Support signaling of last segment number

  28 mars 2018, par sanilraut

  avformat/dashdec : Support signaling of last segment number
  Last segment indicated by mpd is not parsed.
  
  Example stream : http://dash.akamaized.net/dash264/TestCasesIOP41/LastSegmentNumber/1/manifest_last_segment_num.mpd
  This patch supports parsing of Supplemental Descriptor with @schemeIdUri set to http://dashif.org/guide-
  
  lines/last-segment-number with the @value set to the last segment number.
  Reviewed-by : Steven Liu <lq@onvideo.cn>
  

  • [DH] libavformat/dashdec.c