Здравствуйте, есть один скрипт
#!/bin/bash
INRES="1024x768" # input resolution
OUTRES="640x360"
OFFSET="0,0"
FPS="25" # target FPS
QUAL="fast" # one of the many FFMPEG preset
STREAM_KEY="live_************************"
URL="rtmp://live.twitch.tv/app/$STREAM_KEY"
ffmpeg -f x11grab -s "$INRES" -r "$FPS" -i :0.0+$OFFSET -ab 192k \
-f alsa -ac 2 -i pulse -vcodec libx264 -crf 30 -preset "$QUAL" -s "1280x720" \
-vol 11200 -acodec libmp3lame -ar 44100 -threads 0 \
-f flv "$URL"
