High and unstable CPU / Mem usage for the archive on bullseye

[jooola]

The CPU and memory usage of the archiver is unstable and sometimes uses the entire virtual machine resources. This happens on bullseye, while it wasn't an issue on buster.

I previously added a way to set the -re flag and -copy flag to prevent the archiver to eat too much resources, but it seems we have another issue here.

[jooola]

Earhorn has process metrics exported using prometheus, I'll try to put them in meaningful charts to maybe find some more clues.

[jooola]

I've experimented quickly with other builds of ffmpeg and it seems the ffmpeg version packaged by debian is the source of this bug. Still needs more investigation.

As workaround I'll try running with another build of ffmpeg in production and see how it goes.