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• No sound when running ffmpeg on youtube live

  28 mai 2020, par Bartonsen

  Despite my limited knowledge in ffmpeg, I've managed to livestream my birdbox camera to youtube using ffmpeg running on a raspberry pi. The camera has also audio and by using local vlc in windows with rtsp, the audio is ok.

  



  However, on youtube there is no sound (same rtsp command as used locally in windows), and I see this "warning" in youtube studio : "The current bitrate (0) of the audio stream is lower than the recommended bitrate. We recommend using a 128 Kbps bitrate for the audio stream."

  



  How can I get the sound through youtube ?
This is the command I run. The command was found on the net, and I adopted it for my usage, and got video working straight away :

  



  pi@raspberrypi:~ $ ffmpeg -f lavfi -i anullsrc -thread_queue_size 512 -rtsp_transport udp -i "rtsp://10.x.x.x:554/user=user&password=password&channel=1&stream=0.sdp?real_stream" -tune zerolatency -vcodec libx264 -use_wallclock_as_timestamps 1 -pix_fmt + -c:v copy -c:a aac -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/mykey
ffmpeg version git-2020-05-01-3c740f2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 6.3.0 (Raspbian 6.3.0-18+rpi1+deb9u1) 20170516
  configuration: --arch=armel --target-os=linux --enable-gpl --enable-libx264 --enable-nonfree
  libavutil      56. 43.100 / 56. 43.100
  libavcodec     58. 82.100 / 58. 82.100
  libavformat    58. 42.102 / 58. 42.102
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 80.100 /  7. 80.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, lavfi, from 'anullsrc':
  Duration: N/A, start: 0.000000, bitrate: 705 kb/s
    Stream #0:0: Audio: pcm_u8, 44100 Hz, stereo, u8, 705 kb/s
Guessed Channel Layout for Input Stream #1.1 : mono
Input #1, rtsp, from 'rtsp://10.x.x.x:554/user=user&password=password&channel=1&stream=0.sdp?real_stream':
  Metadata:
    title           : RTSP Session
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #1:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 1920x1080, 20 fps, 20 tbr, 90k tbn, 180k tbc
    Stream #1:1: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s
Multiple -c, -codec, -acodec, -vcodec, -scodec or -dcodec options specified for stream 0, only the last option '-c:v copy' will be used.
Stream mapping:
  Stream #1:0 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (pcm_u8 (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, flv, to 'rtmp://a.rtmp.youtube.com/live2/mykey':
  Metadata:
    encoder         : Lavf58.42.102
    Stream #0:0: Video: h264 (Main) ([7][0][0][0] / 0x0007), yuvj420p(pc, bt709, progressive), 1920x1080, q=2-31, 20 fps, 20 tbr, 1k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.82.100 aac
[flv @ 0x2c43750] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly


  


• Update parameters during ffmpeg encoding process is running

  24 avril 2019, par Harshil Makwana

  I want to update parameters like fps, bitrate, gop of video encoder which were already passed to AVCodecContext structure previously.I want to get it’s reflection at same time whenever I update any parameters.

  One thing can be done, is that need to close codec using av codec close and again open it.

  But I think that is not good way.

  Here is my ffmpeg’s source code for video encoding :

          int got_output = 0, ret = 0;
  
          //av_init_packet(&pkt);
  
          pkt.data = NULL;    // packet data will be allocated by the encoder
  
          pkt.size = 0;
  
          ret = avcodec_encode_video2(c, &pkt, frame, &got_output);
  
          if (ret < 0)
  
          {
  
                  cerr << "Error sending a frame for encoding\n";
  
                  exit(1);
  
          }

  Is there any FFMPEG’s API that can be used to reload encoding parameters ?

• ffmpeg ; Running 2 zoom commands in one render

  2 juin 2021, par RewossKy

  I want to output 2 different zoom commands in a single render on the single video below. How can I do that ?

  


  ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,5),3),2,1.05)':d=1:x=iw/3-(iw/zoom/2):y=ih/3-(ih/zoom/2):fps=29.97" output.mp4


  


  ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,10),3),2,1.05)':d=1:x=iw/1-(iw/zoom/2):y=ih/3-(ih/zoom/2):fps=29.97" output.mp4