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• How to synchronize audio and video in FFMPEG/C++

  4 juillet 2016, par rlnunes

  I’m receiving 2 streams (an audio and a video) with timestamps from other PCs in my network.
  I’m able to record the video and the audio to separated files (mp4 and aac) with no problems.
  Now I’m trying to put the 2 streams together into a mp4 file, I’ve created 2 queues, one for audio packets and another for video packets and trying to sync them like this :

  void * muxer(void * param) {
  
      QPair completePacketAudio;
  
      QPair completePacketVideo;
  
      AVPacket pkt;
  
      int vts = 0;
  
      int ats = 0;
  
      while(threadMuxRun) {
  
          contextMutex.lock(); 
  
          if(audioPacketQueue.isEmpty() && videoPacketQueue.isEmpty()) {
  
              contextMutex.unlock();
  
              Sleep(0);
  
              continue;
  
          } else if(audioPacketQueue.isEmpty()) {
  
              completePacketVideo = videoPacketQueue.head();
  
              pkt = videoPacketQueue.dequeue().first;
  
              pkt.pts = vts;
  
              vts++;
  
              std::cout << "video ts:" << pkt.pts << std::endl;
  
              av_packet_rescale_ts(&pkt, video_st.st->time_base, video_st.enc->time_base);            
  
          } else if(videoPacketQueue.isEmpty()) {
  
              completePacketAudio = audioPacketQueue.head();
  
              pkt = audioPacketQueue.dequeue().first;
  
              pkt.pts = ats;
  
              ats++;
  
              std::cout << "audio ts:" << pkt.pts << std::endl;
  
              av_packet_rescale_ts(&pkt, audio_st.st->time_base, audio_st.enc->time_base);
  
          } else {
  
              completePacketAudio = audioPacketQueue.head();
  
              completePacketVideo = videoPacketQueue.head();
  
              if(completePacketVideo.second < completePacketAudio.second) 
  
              {
  
                  pkt = completePacketVideo.first;
  
                  pkt.pts = vts;
  
                  vts++;
  
                  videoPacketQueue.dequeue();
  
                  std::cout << "video ts:" << pkt.pts << std::endl;
  
                  av_packet_rescale_ts(&pkt, video_st.st->time_base, video_st.enc->time_base);
  
              } else {
  
                  audioPacketQueue.dequeue();
  
                  pkt = completePacketAudio.first;
  
                  pkt.pts = ats;
  
                  ats++;
  
                  std::cout << "audio ts:" << pkt.pts << std::endl;
  
                  av_packet_rescale_ts(&pkt, audio_st.st->time_base, audio_st.enc->time_base);
  
              }
  
          }
  
          av_interleaved_write_frame(outputContext, &pkt);
  
          av_free_packet(&pkt);
  
          contextMutex.unlock();
  
  
  
      }
  
  
  
      return NULL;
  
  }

  my videos is about 10% faster than the audio, and the audio timing is correct (it has 2 minutes when I record for 2 minutes, but the video has just 1:48).

  If someone can give a tip, thanks in advance.

• poster adjustment after getting it from video

  30 juin 2016, par Jass

  I am capturing poster from this video https://www.youtube.com/watch?v=wg-kEWsL6Xc using following code. Video can be any, I am just giving example.

  shell_exec('ffmpeg -y  -itsoffset -4  -i "'.base_path().'/assets/videos/'.$file_name.'.mp4" -vcodec mjpeg -vframes 1 -an -f rawvideo -filter:v scale=1170:ih*1170/iw "'.base_path().'/assets/videos/thumbnail/'.$file_name.'.jpg"')

  Width = 1170px,

  Height= 300px (as it is background image so it does not matter)

  But I am facing adjustment problem. Following are my current views

  First : Head is cutting, here I am using css property background : url(’completepath’) center no-repeat ;
  

  Second : Showing black portion on top of head. This is the original image that I am getting from ffmpeg code.

  

  My Question : But I need image like in you tube, you can notice that in all videos we can see top portion of humans without being cutting even black portion is well adjusted.

  Currently I am downloading and testing with youtube videos but in actual job seekers will make their own videos using android/iphone or any camera and will upload on our site.

  so how i can overcome this issue means show image with proper human face and body ?

  thanks in advance.

• creating mp4 url from m3u8 url from ffmpeg

  17 mai 2016, par user3440716

  I have a m3u8 url :

  http://esioslive6-i.akamaihd.net/hls/live/202874/AL_P_ESP1_INTER_ENG/playlist_1000.m3u8

  and i am trying to convert this link to mp4 in url form.

  what i am trying :

  ffmpeg -i  http://esioslive6-i.akamaihd.net/hls/live/202874/AL_P_ESP1_INTER_ENG/playlist_1000.m3u8 -c copy -bsf:a aac_adtstoasc http://esioslive6-i.akamaihd.net/hls/live/202874/AL_P_ESP1_INTER_ENG/output.mp4

  is it possible ?

  code which i am trying :

  <?php
  
  $i = "ffmpeg -i  http://esioslive6-i.akamaihd.net/hls/live/202874/AL_P_ESP1_INTER_ENG/playlist_1000.m3u8 -c copy -bsf:a aac_adtstoasc http://esioslive6-i.akamaihd.net/hls/live/202874/AL_P_ESP1_INTER_ENG/output.mp4";
  
  
  
  ?>
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  <video controls="controls" tabindex="0" autoplay="autoplay" loop="loop">
  
  <source src="&lt;?php">></source></video>

  I am new and I also saw this post FFMPEG mp4 from http live streaming m3u8 file ? but i dont understand why something is not happening.