Audio Missing in Screen Recording

Version information

fluent-ffmpeg version: 2.1.2
ffmpeg version: 5.0.1
OS: macOS Catalina 10.15.7

Code to reproduce

Source 1 is my screen and source 0 is my microphone.


let command = ffmpeg({ source: '1:0' })
command.inputFormat('avfoundation')
command.fps(60)
command.videoCodec('libx264')
command.audioBitrate('320k')
command.audioCodec('libmp3lame')
command.addOption('-pix_fmt', 'yuv420p')
command.save('output.mp4')

Expected results

Both screen and audio should be in the output video.

Observed results

Only the screen is recorded - no audio in the output file.

When I try '':0" as a source, it records the audio. Interestingly, if I try "0:0" (basically my webcam and my mic) it records both webcam video and mic audio correctly. If I put "1:0" it records the screen, but not the mic audio. Strange bug

Tested it also using ffmpeg in the terminal - works successfully! Example: ffmpeg -f avfoundation -i "1:0" -c:v libx264 -c:a aac -filter:v fps=60 -pix_fmt yuv420p ~/output.mp4

fluent-ffmpeg / node-fluent-ffmpeg