Today I mixed my desktop audio along with the mic audio in my existing #ffmpeg #shell #script Now I think I have a near perfect solution to completely replace #obs which I haven't used in a week now.
#ffmpeg #obs #audiomix
Script to record or stream
Replace "~/$TIMESTAMP.$OUTPUT_EXTENSION" in the last line with "-f flv "$YOUTUBE_URL/$KEY"" to stream instead of recording.
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#! /bin/bash
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#Configurations
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VBR="1500k"
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FPS="24"
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BUFSIZE="3000k" #twice of bitrate
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QUAL="ultrafast"
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SIZE=1366x768
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WEBCAMSIZE=320x240
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AUDIO_ENCODER="aac"
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CURRENT_DIRECTORY=${PWD}
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OUTPUT_EXTENSION=$1
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echo "Recording to path: $1 "
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TIMESTAMP=$(date "+%Y-%m-%d-%H-%M-%S")
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YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2"
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KEY="111-111-222"
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AUDIO_FILE="/home/ravisagar/projects/ffmpeg-livestreamer/songs/allsongs.mp3"
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# Use - pactl list sources, to check desktop audio source
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DESKTOP_AUDIO="alsa_output.pci-0000_00_1b.0.analog-stereo.monitor"
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MIC=$(arecord -l | grep "Samson" | cut -d ':' -f 1 | cut -d ' ' -f 2)
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#command starts here
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ffmpeg \
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-video_size $SIZE -framerate $FPS -f x11grab -probesize 10M -thread_queue_size 8192 -i :0.0+1920,0 \
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-f alsa -ac 2 -thread_queue_size 8192 -i hw:$MIC \
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-f pulse -ac 2 -thread_queue_size 8192 -i $DESKTOP_AUDIO \
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-filter_complex \
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"[1:a]channelsplit=channel_layout=stereo:channels=FR, \
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showfreqs=s=240x200:ascale=sqrt:cmode=combined:colors=#330000@0.5[right]; \
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[1:a]channelsplit=channel_layout=stereo:channels=FL, \
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showfreqs=s=240x200:ascale=sqrt:cmode=combined:colors=#330000@0.5,vflip[left]; \
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[right][left]vstack[w]; \
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[0:v][w]overlay=x=W-w-30-10:y=H-h-30+200-10[bg2]; \
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[bg2]drawtext=text='<a href="https://www.ravisagar.in/%3Cspan%20style%3D"color: #000000; font-weight: bold;">//www.ravisagar.in':">www.ravisagar.in':</a> \
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fontcolor=white:fontsize=18:box=1: \
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boxcolor=#330000@0.5:boxborderw=10: \
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x=30:y=(h-text_h-30),format=yuv420p[v]; \
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[1:a]adelay=500|500,volume=2[a1]; \
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[2:a]adelay=750|750[delayed]; \
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[delayed][a1]amix=inputs=2[a]" \
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-map "[v]" -map "[a]" \
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-c:v libx264 -preset $QUAL -r $FPS -g $(($FPS *2)) -b:v $VBR -bufsize 3000k -maxrate $VBR \
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-c:a $AUDIO_ENCODER -ar 44100 -b:a 128k -pix_fmt yuv420p \
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~/$TIMESTAMP.$OUTPUT_EXTENSION
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# -f flv "$YOUTUBE_URL/$KEY"
For showing my webcam I don't use ffmpeg, instead I used another script to display my webcam on the desktop using mpv, good thing about this script is that I can zoom in , zoom out, move the webcam window (which is mpv playing directly from my webcam) and I have a keybindings for all this. Take a look at this video for more explanation.
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