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• How to avoid audio pts start from zero after reconfigure the atempo ?

  7 avril 2017, par Jerikc XIONG

  I found the pts of audio is always start from zero if i reconfigure the atempo filter in ijkplayer which based on ffplay.

  The code snippet is from ijkplayer

  #ifdef FFP_AVFILTER_PLAYBACK_RATE
  
      if (fabsf(ffp->pf_playback_rate) > 0.00001 &&
  
          fabsf(ffp->pf_playback_rate - 1.0f) > 0.00001) {
  
          if (afilters_args[0])
  
              av_strlcatf(afilters_args, sizeof(afilters_args), ",");
  
  
  
          av_log(ffp, AV_LOG_INFO, "af_rate=%f\n", ffp->pf_playback_rate);
  
          av_strlcatf(afilters_args, sizeof(afilters_args), "atempo=%f", ffp->pf_playback_rate);
  
      }
  
  #endif
  
  
  
      if ((ret = configure_filtergraph(is->agraph, afilters_args[0] ? afilters_args : NULL, filt_asrc, filt_asink)) < 0)
  
          goto end;
  
  
  
      is->in_audio_filter  = filt_asrc;
  
      is->out_audio_filter = filt_asink;

  How to avoid audio pts start from zero after reconfigure the atempo filter ?

• Livestream doesn't start unless I open the YouTube Live Dashboard [closed]

  20 mars 2024, par Gavin Trujillo

  I have a camera feed that streams 24/7 on YouTube. Everything works fine, except the stream often goes down due to internet reliability issues. I can detect that the stream is down with the v3/search endpoint, then an automated command is sent from my server to restart it, but the stream doesn't start like it should.

  


  I've discovered that the live stream will only start if I open the YouTube Live Dashboard first.
Before opening the dashboard, my streaming software will upload data using the stream key, but there's no live stream. Upon opening the YouTube Live Dashboard, it shows "Good Connection" but with no video feed. My automation script is continuously restarting the stream, so it comes up very shortly after opening the dashboard every time.

  


  Streaming software : I use ffmpeg to translate an RTSP stream directly to YouTube.

  


  ffmpeg -rtsp_transport tcp -re -i "rtsp://$cameraLink" -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -force_key_frames "expr:gte(t,n_forced*2)" -nostdin -f flv -map 0:v:0 -map 1:a:0 -c:v libx264 -preset ultrafast -crf 43 -s 1280x724 -r 30 -c:a aac "rtmp://a.rtmp.youtube.com/live2/$streamKey"


  


  Since entering into the YouTube Live Dashboard seems to start some sort of "active state", I've tried various Oauth2 and key API methods to start the live stream. I haven't gotten anything to work so far.

  


• FFMPEG concat video and audios with certain start point for each

  6 août 2022, par Jybrcfn CA

  I have some video files without voice and some audios and all of them are in .flv format. I want to combine them as a single file in way that each video or audio start at given start_time. the start_times are in way that no two videos or two audios overlap but there might be a distance between end of a video/audio and start of the next video/audio. Is there any way to do it using FFMPEG ?

  


  for example :

  


  





  


  


  


  


  



  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  


  file	start_time(milliseconds)
  audio1	400
  audio2	1400
  audio3	3100
  video1	0
  video2	1000
  video3	2000
  video4	3700

  


  


  audio -> *

  


  video -> +

  


  emty -> -

  


  final result should be some thing like

  


  ---*******---**************---**********************--

  


  +++++++--+++++++---++++++++++++++---++++++++++++++++++

  


  Thank you in advance.