Hey all. Long time Kdenlive user (2016-present) and I'm having a problem.

I have GPU acceleration turned on in Settings, and that seems to work OK.
I have a custom MP4 profile:

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properties=x264-medium f=mp4 vcodec=h264_vaapi acodec=aac g=120 crf=%quality ab=%audiobitrate+'k'

As you can see, I am attempting to use VA-API hardware acceleration to speed up render times.
When I have

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vcodec=h264_vaapi

set, there is little CPU usage and some GPU usage. The resulting file only has audio, but no video.
When I have

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vcodec=libx264

set, there is lots of CPU usage and some GPU usage. The resulting file has both audio and video.

How do I configure my profile so I can use VA-API hardware acceleration for rendering AND get a file with video and audio?

Thanks in advance.

Try this:

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vaapi_device=/dev/dri/renderD128 vf='format=nv12,hwupload' properties=x264-medium f=mp4 vcodec=h264_vaapi threads=4 real_time=-1 preset=faster acodec=aac g=120 crf=%quality ab=%audiobitrate+'k'

Video Quality options set to: 15,20,28,32,45
Audio Quality options set to: 320,256,192,128

If you have more than 4 cpu threads (inkl. hyperthreading) then adjust

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threads=

pappl