Transcoding not working on docker with QSV

[TheDreadPirate]

I'm sorry for the delay. I probably didn't set the notifications settings right.
The option you mentioned was already unchecked. The link you sent made me realize that I was trying to transcode HEVC with a depth of 10 bits, that is unsupported by my iGPU.
Transcoding of HEVC 8bit lead to the same error though

In my post I stated that your CPU/iGPU doesn't support HEVC ENcoding.  There is a separate check box farther down labeled "Allow encoding in HEVC format" and that you need to uncheck that one.