runOnDemand - Pipe command outputs

[davidtaddei]

Question

Server version:

I have a scenario where I need to pre-process a stream of bytes before they are passed to ffmpeg. Ordinarily I'd do the following to take the output of a pre-processor and feed it to ffmpeg:

python main.py | ffmpeg -i pipe:0

In this case the main.py pre-processor is writing to stdout and when run in a normal shell this works perfectly. Running a similar command directly or wrapped in a bash script as part of the mediamtx runOnDemand config items results in mediamtx capturing the stdout from main.py and logging it rather than sending onward to ffmpeg.

Does anyone know of a way to use stdin/stdout in a runOnDemand config entry?

[aler9]

Hello, you can use bash commands and pipes in runOnDemand by instantiating bash:

paths:
  mypath:
    runOnDemand: bash -c 'python main.py | ffmpeg -i pipe:0'

[bluenviron-bot]

This discussion is being locked automatically because the last update was more than 2 years ago.

Do not use the content of this discussion as reference since it's probably outdated!

The official documentation is the only place in which you can find up-to-date answers.