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• How to use ffmpeg to overlay waveforms on xstack mosaics and specify specific audio for playback

  1er mai 2022, par kellib

  I would like to make a mosaic of multiple titled streams, 1) specifying which of the audio streams to play and 2) overlay waveforms at the bottom of each of the video tiles for the audio that they belong to.

  


  I'm successfully able to create the titled mosaic of streams with the code below.

  


  However :

  


  

  1. I'm having a hard time figuring out how to specify just one of the specific audio sources. I found amix, but I don't really want to mix them, I just want to specify audio [a0], or [a1], or [a2], etc.

  


  


  and

  


  

  2. I'm having a hard time figuring out how to overlay the wave forms at the bottom of the video for each of the tiles. I struggled trying to figure out putting showwaves into the mix. Is it possible ?

  


  


  I want each tile to look like this, but since these are rtmp streams, they need to play-out the matching waveforms dynamically with each stream. https://dragonquest64.blogspot.com/2020/01/ffmpeg-audio-waveform.html

  


  If someone could point me in the right direction, that would be great. I'm getting close, but I'm pretty new to all of this, and have already spent way more time than I should have, so would love a little help.

  


  ffmpeg \
-i rtmp://my.cdn.com/srcEncoders/STREAM-1 \
-i rtmp://my.cdn.com/srcEncoders/STREAM-2 \
-i rtmp://my.cdn.com/srcEncoders/STREAM-3 \
-i rtmp://my.cdn.com/srcEncoders/STREAM-4 \
  -filter_complex " \
      [0:v] setpts=PTS-STARTPTS, scale=qvga \
    , drawtext=text=STREAM-1:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a0]; \
      [1:v] setpts=PTS-STARTPTS, scale=qvga \
    , drawtext=text=STREAM-2:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a1]; \
      [2:v] setpts=PTS-STARTPTS, scale=qvga \
    , drawtext=text=STREAM-3:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a2]; \
      [3:v] setpts=PTS-STARTPTS, scale=qvga \ 
    , drawtext=text=STREAM-4:fontsize=20:x=10:y=10:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5 [a3]; \
      [a0][a1][a2][a3]xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0[out]; \
    amix=inputs=1
      " \
  -map "[out]" \
 -c:v libx264 -b:v 1000k -g 30 -keyint_min 120 -profile:v baseline -preset veryfast -f mpegts "udp://127.0.0.1:1234?pkt_size=1316"


  


• Only '-vf scale.....' read, ignoring remaining -vf options : Use ',' to separate filters even though no other vf present

  24 septembre 2019, par Vitalis Hommel

  I am using

  ffmpeg -y -ss 00:02:24.643 -fflags +igndts -t 00:00:39.337 -i 1.mp4 -r 60 -c:v libx264 -copytb 1 -vf scale=-2:1080,pad=width=1920:height=1080:x=0:y=656:color=black -af afade=t=in:ss=0:d=1,afade=t=out:st='00\:00\:38.337':d=1 2.mp4

  and I get

  Only '-vf scale=-2:1080,pad=width=1920:height=1080:x=0:y=656:color=black' read, ignoring remaining -vf options: Use ',' to separate filters
  
  Only '-af afade=t=in:ss=0:d=1,afade=t=out:st='00\:00\:38.337':d=1' read, ignoring remaining -af options: Use ',' to separate filters

  How to solve this ?

• FFMPEG stream is corrupted on Exoplayer

  12 septembre 2023, par Musa Kavak

  I'm trying to stream my computer's screen with UDP to display in Android with Exoplayer.

  


  I started the stream with this line :

  


  ffmpeg -re -f x11grab  -i :0 -c:v libx264 -preset ultrafast -tune zerolatency  -f mpegts udp://192.168.1.107:40001`


  


  And received with the media3 Exoplayer :

  


    Surface {
                val exoPlayer = ExoPlayer.Builder(this@MainActivity).build().apply {
                    //Same result as setMediaSource()
                    setMediaItem(MediaItem.fromUri("udp://192.168.1.107:40001"))
                    prepare()
                }

                AndroidView(
                    factory = {
                        PlayerView(it).apply {
                            player = exoPlayer
                        }
                    }
                )
  }


  


  But the result is black screen with dots :

  


  

  


  I can see the stream with ffplay it's working perfectly.

  


  I tried to add audio to the stream because I thought a mpegts file without audio could cause the problem. I can hear the audio but video still the same.

  


  Then switch to Windows and tried with gdigrab and... Yes, still the same.

  


  Thank you for your time in advance.