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• Record linux screen (audio/video) and stream to an API

  5 juin 2024, par Joel

  I'm running a browser on a Linux server, and I'm trying to figure out the best way to capture the audio/video of the screen, and stream that with as little latency as possible to an API on another server.

  


  Requirements :

  


  

  • Stream the audio from server A to server B so that server B can pipe that forward to an online transcription service.

  


  • Stream the audio and video from server A to server B so that server B can store the contents to some kind of blob storage. If the stream is killed for some reason before it's ended, the partial contents should be saved and still be playable.

  


  


  I've successfully captured the audio/video to disk using ffmpeg (see below), but I'm really unsure how I should change that to stream the contents to an API instead.

  


  The API is currently ASP.NET Core 8, but it could be node/python/whatever really.

  


  ffmpeg -y -video_size 1920x1080 -framerate 30 -f x11grab -i :0 -f pulse -i default -c:v libx264 -pix_fmt yuv420p -c:a aac -strict experimental /app/recordings/output.mp4


  


• ffmpeg change inputs / mapping while recording

  20 avril 2020, par Suuuehgi

  I have a rtsp video-source stream1 and an audio source I currently merge and send to a rtmp-server using :

  



  stream1="rtsp://streamurl1"

/usr/bin/ffmpeg                    \
    [...]
    -i "$stream1"                  \
    [...]
    -itsoffset $AUDIOVIDEOOFFSET   \
    -f pulse                       \
    -i default                     \
    [...]
    -vcodec copy                   \
    -map 0:v -map 1:a              \
    [...]
    -f flv "rtmp://streamingserver"


  



  


  I would now like to add a second video source stream2 and switch between stream1 and stream2 back and forth without interrupting the audio. Both streams are identical / come from identical cameras.

  


  



  Is there any sane way to do this with ffmpeg ? Or how would you recommend doing it ?

  



  Just stopping the process and restarting it using stream2 instead of stream1 works but results in several seconds outage on the stream and is the current worst case scenario I would like to improve.

  


• Twitch stream with FFMpeg using multiple audio inputs [on hold]

  23 décembre 2014, par Josh Raymond

  I’m using the following script to try and stream my linux desktop to Twitch.tv, I have the stream working, but I want to throw in 2 audio inputs into the stream (one for the game, and one for my mic)

  Here’s the script

  #! /bin/bash
  
  INRES="1900x600"
  
  OUTRES="800x600"
  
  INAUD="pulse"
  
  FPS="25
  
  STREAM_KEY=$(cat ~/.twitch_key)
  
  STREAM_URL="rtmp://live.twitch.tv/app/$STREAM_KEY"
  
  
  
  ffmpeg \
  
  -f alsa -ac 2 -i "$INAUD" \
  
  -f x11grab -s "$INRES" -r "$FPS" -i :0.0+1280,0 \
  
  -vcodec libx264 -s "$OUTRES" -pix_fmt yuv420p \
  
  -acodec libmp3lame -threads 6 -qscale 5 -b 64KB \
  
  -f flv -ar 44100 "$STREAM_URL"

  I use Pulseaudio and have pavucontrol, if that matters. The game would be on "Build-in Audio Analog Stereo" and the mic is from the recording device "Webcam C110 Analog Mono"

  Thanks in advance.