Can not setup encoder - random crash - anyone else

[IcePlanet]

Randomly I see error message.

"Can not setup encoder. The configuration supplied to the encoder may be incompatible or the encoder might depend on features unavailable on this system".

This never happens during "one instance" operation of Avidemux. Because one Avidemux provides load for cca 3-5 cores, I run multiple instances of Avidemux in parallel to utilize all cores (it is not described in manual, but on forum this was listed as possible).
If the avidemux is closed, opened as new instance, loaded the same .py script it does not fail.

For this reason it is difficult to find anything reasonable from log, because there are multiple records mixed and I do not see any error message listed.

I use x265 codec.

Does anyone has similar experience? Is it really safe to run multiple instances of Avidemux?

[eumagga0x2a]

it is not described in manual, but on forum this was listed as possible

https://avidemux.org/smif/index.php/topic,20172.msg95174.html#msg95174

https://avidemux.org/smif/index.php/topic,20348.msg96110.html#msg96110

https://avidemux.org/smif/index.php/topic,20227.msg95460.html#msg95460

Is it really safe to run multiple instances of Avidemux?

No.