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Why do I encounter this error in OBS Studio?

Failed to open NVENC codec: Function not implemented.

More importantly, what can I do to resolve it so that I can record?

This is a new install of OBS Studio 23.0.2 (64 bit) on Windows 7 Professional SP 1. According to Device Manager drivers for both display adapters are up to date (NVIDIA GRID K140Q & VMware SVGA 3D).

After installation I stepped through the auto-configuration wizard and the rest of the OBS Studio Quickstart guide. There are two displays. Per the guide I added one new source, a Display Capture source set to the second (non-primary) display.

After setting up the source and making it visible I can see the second monitor being captured in OBS:

OBS display capture source

But, when I click on Start Recording I encounter this dialog:

enter image description here

Here are the settings and full error message from the log:

12:41:26.383: [NVENC encoder: 'simple_h264_recording'] settings:
12:41:26.383:   rate_control: CQP
12:41:26.383:   bitrate:      0
12:41:26.383:   cqp:          23
12:41:26.383:   keyint:       250
12:41:26.383:   preset:       hq
12:41:26.383:   profile:      high
12:41:26.383:   width:        1920
12:41:26.383:   height:       1080
12:41:26.383:   2-pass:       false
12:41:26.383:   b-frames:     2
12:41:26.383:   GPU:          0
12:41:26.383: 
12:41:26.441: [NVENC encoder: 'simple_h264_recording'] Failed to open NVENC codec: Function not implemented
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2 Answers 2

Reset to default
6

I just had the same issue on Win 7 with my GTX 750 TI.

Turns out my GPU doesn't suport NVENC.

Using software encoder (x264) worked just fine.

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  • Yep that worked @user1020800.
    – Douglas Reid
    Commented Apr 12, 2019 at 20:17
  • 3
    I didn't know what you meant by "Using ... worked for me." Where was the option to use x264 instead of NVENC? I found it under File > Settings > Output > Recording > Encoder.
    – MM.
    Commented Oct 12, 2019 at 16:51
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Just to elaborate the answer from @user1020800,

I found "NVENC" on OBS' "Controls -> settings", then "Streaming -> Video Encoder" where the value was "Hardware (NVENC, H.264)". Changing the value to "Software (x.264)" (in the case of "Ouput Mode: Simple) resolved the issue for me.

Verified on Ubuntu 22.04, OBS Studio 30.1.2

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