[FFmpeg-user] Disable ?UUID? randomnness ?

[Gyan Doshi]

On 2021-12-04 07:17 am, Toerless Eckert wrote:
> Hi
>
> I am trying to set up ffmpeg to convert media file, mostly container format,
> e.g.: mp4/avi to mkv or the like (no reencoding).
>
> I notice that the same ffmpeg run creates binary different files
> every time it is run (on the same input). I would like the output file
> to be reproduceable the same. What i see is that UUIDs for tracks for example
> are randomnly generated.
>
> I found in documenttion --disable-random, but no ffmpeg build i can find
> seem to have this option.
>
> Whats the suggested option to disable this randomnness (or see it predictably) ?

The general option is -bitexact.

This doesn't apply to your usage but note that there are some encoders 
which aren't deterministic, so some variance can be seen.

Regards,
Gyan