FFmpeg transcoding on Lambda results in unusable (static) audio

Question

I\'d like to move towards serverless for audio transcoding routines in AWS. I\'ve been trying to setup a Lambda function to do just that; execute a static FFmpeg binary and

Answer 1

Alright this is a fun one.

So it turns out the Python subprocess inherits stdin from some Lambda processes going on in the background. I was watching this AWS re:Invent keynote and he was describing some issues they were having w.r.t. this issue.

I added stdin=subprocess.DEVNULL to the subprocess call and the audio is now fixed.

Very interesting bug if you ask me.