Can I run TWO ffmpeg processes in parallel?

[pxstein]

Can I run TWO ffmpeg encoding or verification processes in parallel on the same computer?

Or do they interfere each other because they e.g use the same temporary files or caches or internal config files or .....?

[poisondeathray]

Yes you can

(It would have been just as easy to test it yourself)

[johns0]

You can but it will be better just to run one at a time since it will task your cpu.

[pandy]

As above - it is perfectly legal and even sometimes advised to use multiple ffmpeg at the same time (advised when not all cores/threads are used) of course there is concurrency between such instances and some shared resources may (RAM, HDD etc) can be saturated. Frequently piping is used to allow higher CPU utilization.
Everything depends from usage case.

[Selur]

As a side note: if you use a encoder which uses two pass, you just need to make sure that they use different files to save their statistic data they collect during the first pass.