Custom Output (FFMPEG) vaapi encoder crashes on init FFMPEG 4.4

Operating System Info

Other

Other OS

Fedora 35

OBS Studio Version

27.1.3

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/cf95rQ7oRBI3w8up

OBS Studio Crash Log URL

No response

Expected Behavior

To be able to record with hardware acceleration while selecting Custom output(FFmpeg).

Current Behavior

I am trying to set up hardware accelerated encoding via vaapi and trying to pass vaapi_device=/dev/dri/renderD128 to ffmpeg but when i start recording OBS it will crash. In logs there will be Failed to set vaapi_device=/dev/dri/renderD128

I tried to write it to muxer setting or video setting but it crash in both cases. As far i understand vaapi_device is not video encoder /muxer settings. And there is no other option to pass variable.

Steps to Reproduce

1. Settings from screenshot
2. Start recording and crash OBS

Anything else we should know?

I found different https://github.com/obsproject/obs-studio/issues/2296#issuecomment-840957925 that this is not possible, but issue was closed anyway. Yes i saw last comment but it's not working as you can see from my settings

Start by reproducing the crash using OBS Studio 27.1.3 on Fedora 35 with Custom Output (FFmpeg) and vaapi_device=/dev/dri/renderD128, then inspect the linked OBS log for the failure. Compare behavior when the setting is supplied as a muxer or video setting. Done means recording no longer crashes and the supported vaapi configuration behaves as documented.