obs: add vpl-gpu-rt

[infinisil]

Description of changes

Needed for Intel Quick Sync hardware encoding. Without it, trying to stream with the QuickSync Video Encoder, you get an error:

Starting the output failed. Please check the log for details.

02:37:16.446: Failed to initialize MFX
02:37:16.447: [qsv encoder: 'msdk_impl'] Specified object/item/sync point not found. (MFX_ERR_NOT_FOUND)

Ping @evanrichter @pjungkamp

Things done

• Built on x86_64-linux
  • vpl-gpu-rt is broken on other architectures. Since obs builds on those, only conditionally adding it
• Checked that the error disappears and that hardware encoding is used (using intel_gpu_top)

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[pjungkamp]

You shouldn't add vpl-gpu-rt to the inputs of any package. It's only used as one of the backing implementations of libvpl. If your hardware needs vpl-gpu-rt for QSV you should add it to hardware.opengl.extraPackages. obs should then be able to use it through libvpl.

[pjungkamp]

The situation around Intel QSV isn't properly documented anywhere but the PR comments. I'll have to check how to update the Wiki on this.

[infinisil]

Ah that's great to know, and I can confirm that it works, thanks!