CODEWITHSUNDEEP
swiftcpu-usagecmsamplebufferavassetreader
jnorris
jnorris

Reputation: 43

Force GPU usage with copying video sample buffers via AVAssetReader/AVSampleBufferDisplayLayer

I am looping 1 second mp4/h264 videos with no audio on an M1 Mac Mini. AVPlayer was causing hitches with scrolling.

Now I read videos using AVAssetReader and feed those CMSampleBuffers into a AVSampleBufferDisplayLayer.

To get it to seamlessly loop without having to create a new AVAssetReader, I just cache all of those samples in an array and create copies with new timing via CMSampleBufferCreateCopyWithNewTiming. These are short videos so it's not a lot of data.

It all works pretty great now with no hitches. However the VTDecoderXPCService is going nuts on the CPU. I was expecting the GPU to be doing most of the work for decoding.

Is copying those samples from memory via CMSampleBufferCreateCopyWithNewTiming causing it? Is there a better way?

Upvotes: 0

Views: 226

Answers (0)

Related Questions