[BUG] Output container Type not recognised with AV1

[Selur]

Did a quick test, for me encoding av1 (in webm container) with:

• NVEnc
  
• QSVEnc
  
• aomenc
  
• rav1e
  
• SVT-AV1
  

works fine.
aomenc is the slowest with default settings (so enabling some options to increasing multithreading and cpu utilization is recommended).
(Personally, I usually use NVEnc for av1 encoding.)

Cu Selur