[SOLVED] defining number of threads for "cli"

[tnt]

Hello.

I know that in GUI threads number of threads can be defined (limited) in Edit > Preferences > Threading > Multi-threading,

but is there a command line option to define / limit number of threads while starting "avidemux3_cli" ?

Thx.

[eumagga0x2a]

I know that in GUI threads number of threads can be defined (limited) in Edit > Preferences > Threading > Multi-threading

No, it can't. This setting is a complete fake at the moment. Multithreaded decoding for libavcodec is always disabled. Multithreading for other libraries is the business of those libraries (partially configurable, especially for some video encoders), there is no central kill swtich.

[tnt]

so even x264 encoding cannot be limited to 3 of 4 available cores?

[eumagga0x2a]

No, it can't. I didn't look into details why controls are disabled, however.

[tnt]

well, I have solved this on the system level:

Code Select Expand

taskset --cpu-list 0-2

worked for me @linux

thx.

[eumagga0x2a]

If I am not mistaken, multithreading and CPU affinity are different things.

[tnt]

Well, in this case multithreading should define the number of encoding threads will be used and spread across CPUs during encoding.
With this specific CPU affinity I provide just 3 cores to avidemux_cli/x264 encoder, so it spawns less threads and at the same time occupies not all cores.