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• ffmpeg send video to one process and audio to another

  20 juin 2017, par moo

  I’m using Sailfish OS (Linux), and have built ffmpeg with the hope of using the ffplay player. Video works fine, but audio doesn’t work and I think ffplay would need to be patched to use libaudioresource, which is beyond my skills (others have verified the problem).

  However, the pulseaudio paplay and pacat commands work fine, so for example, I can do :

  ffmpeg -i file.mp4 -f wav - | paplay

  What I’m trying to achieve, is to send video to ffplay and audio to paplay, but the best solution I’ve found so far, is :

  ffmpeg -i file.mp4 -f avi - | tee >(ffplay -) >(ffmpeg -i - -f wav - | paplay) > /dev/null

  This is not very efficient though, and whilst it works, it breaks up frequently, and I was hoping there was a better way of achieving this, using -map 0:a and -map 0:v or FIFOs of something ? Any suggestions much appreciated.

  Thanks

• FFmpeg video alpha merged freezes

  29 mai 2017, par cdapalc

  I am using ffmpeg 4 Android to overlay a video with alpha channnel in a normal video. I use the following command :

  String[] mergeVideosCommand = new String[]{
  
              "-y",
  
              "-i",
  
              videoAlphaPath.mov,
  
              "-i",
  
              videoNormalPath.mp4,
  
              "-filter_complex",
  
              "[0:v]colorchannelmixer=aa=1[ov];[1:v][ov]overlay=0:0[video_out]",
  
              "-map",
  
              "[video_out]",
  
              "-map",
  
              "0:a",
  
              videoResultPath.mp4
  
  };
  
  ffmpeg.execute(mergeVideosCommand, responseHandler);

  Both videos get merged, but the non-transparent one freezes after one second of playing but the video with alpha channel keeps moving and both audios work fine as well.
  I have tried the same command from my computer (with ffmpeg v2.6.3) and it works fine but I need to make it work on Android (ffmpeg v3.0.1).
  Anybody experienced something similar ? I would appreciate any help. Thanks.

• ffmpeg - mpegts Multicast [closed]

  7 juin 2024, par Miguel Duarte

  I'm generating a multicast stream with this command :

  


  ffmpeg -hwaccel_device 1 -format_code Hi50 -re -f decklink -i 'DeckLink Duo (1)' -pix_fmt yuv420p -c:v h264_nvenc -profile:v high -b:v 3500k -rc 2 -cbr true -maxrate 3500k -bufsize 7000k -c:a mp2 -b:a 192k -f mpegts "udp://239.1.1.2:5000?ttl=2&pkt_size=1316"


  


  My problem is that if I open this stream on a device with a 100Mb/s connection, it's heavily pixelated. The same stream on a 1Gb/s device displays fine.

  


  I have other multicast streams from our ISP and they display fine regardless of connection speed.

  


  Has someone come across this issue ? This seems ffmpeg related.

  


  I tried several settings, bitrates, etc. Also playing on VLC, OBS. Same result.

  


  Version :

  


  ffmpeg version N-111519-gefa6cec759


  


  Thanks in advance.