NVENC Codec problem

[Vexrell]

I am trying to use a webcam to record something. I can preview the webcam feed without issue, but when I click record I get an error that says "Failed to open NVENC codec: Unknown error occurred. Try installing the latest NVIDIA driver."

Log file: https://obsproject.com/logs/zrPl39j1UDB1yqxs

Linux MATE 1.26.2 release 24.04.2
NVIDIA Geforce 960 graphics card w/ Nvidia 550 driver, though have had the same error with 570 driver
OpenGL 4.6.0

Asked initially on Linux Mate forums and was directed here:

OBS studio says graphics driver update required

I have an nvidia geforce 960 graphics card. Up to this point, I've been using the compatible drivers for Nvidia 570 as suggested by my system, which kinda sucks but works well enough most of the time. But Nvidia came out with a new (allegedly) linux compatible driver for the 960 last week...

ubuntu-mate.community

Is there anything I can do to correct this?

 

[stephematician]

Looks promising here:

19:14:59.898: NVENC supported

And here:

19:15:14.892: [FFmpeg NVENC encoder: 'simple_video_recording'] settings:
19:15:14.892:     encoder:      NVIDIA NVENC H.264 (FFmpeg)
19:15:14.892:     rate_control: CQP
19:15:14.892:     bitrate:      0
19:15:14.892:     cqp:          21
19:15:14.892:     keyint:       250
19:15:14.892:     preset:       p5
19:15:14.892:     tuning:       hq
19:15:14.892:     multipass:    qres
19:15:14.892:     profile:      high
19:15:14.892:     width:        1272
19:15:14.892:     height:       720
19:15:14.892:     b-frames:     2
19:15:14.892:     psycho-aq:    0
19:15:14.892:     GPU:          0
19:15:14.892:

But then the log looks like it's missing when the error occurs? There's nothing between 19:28:18.137 and 20:35:13.252:

19:28:18.137: 
20:35:13.252: QXcbConnection: XCB error: 3 (BadWindow), sequence: 37954, resource id: 12110731, major code: 40 (TranslateCoords), minor code: 0

Unless the error _is_ the XCB error - which doesn't seem all that related to NVENC, but OBS could be reporting the problem in a weird way.

 

[Vexrell]

Looks promising here:

19:14:59.898: NVENC supported

And here:

19:15:14.892: [FFmpeg NVENC encoder: 'simple_video_recording'] settings:
19:15:14.892:     encoder:      NVIDIA NVENC H.264 (FFmpeg)
19:15:14.892:     rate_control: CQP
19:15:14.892:     bitrate:      0
19:15:14.892:     cqp:          21
19:15:14.892:     keyint:       250
19:15:14.892:     preset:       p5
19:15:14.892:     tuning:       hq
19:15:14.892:     multipass:    qres
19:15:14.892:     profile:      high
19:15:14.892:     width:        1272
19:15:14.892:     height:       720
19:15:14.892:     b-frames:     2
19:15:14.892:     psycho-aq:    0
19:15:14.892:     GPU:          0
19:15:14.892:

But then the log looks like it's missing when the error occurs? There's nothing between 19:28:18.137 and 20:35:13.252:

19:28:18.137:
20:35:13.252: QXcbConnection: XCB error: 3 (BadWindow), sequence: 37954, resource id: 12110731, major code: 40 (TranslateCoords), minor code: 0

Unless the error _is_ the XCB error - which doesn't seem all that related to NVENC, but OBS could be reporting the problem in a weird way.

So what's that mean exactly?
Does is give some indication for what's wrong?

 

[stephematician]

If NVENC is supported, and you can see NVENC options when you go to OBS -> Settings, then that means OBS is seeing all the right things - except when you start to record which is when it goes to actually _use_ the encoder.

As I mentioned, it seemed like the log was incomplete. After it reported encoder selection, there's a 13 minute gap before an empty log message, then another hour before the XCB error. Maybe try a fresh OBS session (you could also 'restart in safe mode') and try recording - then upload the log?