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• FFmpeg to Azure Media Services Smooth Streaming Input

  22 juillet 2020, par Adityo Setyonugroho

  I would like to ask about ffmpeg config or command to to mp4 fragment to Azure Media Service live event using smooth streaming / isml protocol. The AMS is not getting any input yet from ffmpeg.
This is my current running command :

  


  ffmpeg -f dshow -i video="Webcam" -movflags isml+frag_keyframe -f isml -r 10 http://endpoint/ingest.isml/streaming1


  


  When I am using RTMP with Wirecast is running well.

  


  Any suggestion on ffmpeg command with isml protocol ?

  


  Thank you

  


• Wav file duration of Windows media player is not same with ffmpeg

  5 août 2020, par jimmy525

  There is one wav file, if using windows media player open it, its duration is 06:15.
But if using ffmpeg convert it to mp3 or using ffprobe check duration, it shows 06:17.
Of course, other players(like vlc) shows 06:17 too.
What I need to do is, using ffmpeg convert it to mp3 with 06:15 duration.

  


  ffmpeg command :

  


  ffmpeg -i 1.wav -f mp3 out.mp3


  


  Please help me to resolve this problem, Thanks

  


• Confusion about PTS in video files and media streams

  11 novembre 2014, par user2452253

  Is it possible that the PTS of a particular frame in a file is different with the PTS of the same frame in the same file while it is being streamed ?

  When I read a frame using av_read_frame I store the video stream in an AVStream. After I decode the frame with avcodec_decode_video2, I store the time stamp of that frame in an int64_t using av_frame_get_best_effort_timestamp. Now if the program is getting its input from a file I get a different timestamp from when I stream the input (from the same file) to the program.

  To change the input type I simply change the argv argument from "/path/to/file.mp4" to something like "udp ://localhost:1234", then I stream the file with ffmpeg in command line : "ffmpeg -re -i /path/to/file.mp4 -f mpegts udp ://localhost:1234". Can it be because the "-f mpegts" arguments change some characteristics of the media ?

  Below is my code (simplified). By reading the ffmpeg mailing list archives I realized that the time_base that I’m looking for is in the AVStream and not the AVCodecContext. Instead of using av_frame_get_best_effort_timestamp I have also tried using the packet.pts but the results don’t change.
  I need the time stamps to have a notion of frame number in a streaming video that is being received.
  I would really appreciate any sort of help.

  //..
  
  //argv[1]="/file.mp4";
  
  argv[1]="udp://localhost:7777";
  
  // define AVFormatContext, AVFrame, etc.
  
  // register av, avcodec, avformat_network_init(), etc.
  
  avformat_open_input(&pFormatCtx, argv, NULL, NULL);
  
  avformat_find_stream_info(pFormatCtx, NULL);
  
  // find the video stream...
  
  // pointer to the codec context...
  
  // open codec...
  
  pFrame=av_frame_alloc();
  
  while(av_read_frame(pFormatCtx, &packet)>=0) {
  
          AVStream *strem = pFormatCtx->streams[videoStream];
  
          if(packet.stream_index==videoStream) {
  
              avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  
              if(frameFinished) {
  
                  int64_t perts = av_frame_get_best_effort_timestamp(pFrame);
  
                  if (isMyFrame(pFrame)){
  
                       cout << perts*av_q2d(strem->time_base) << "\n";
  
                  }
  
               }
  
  }
  
  //free allocated space
  
  }
  
  //..