[torchcodec] Allow sampler to use GPU decoding #136
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Summary: Pull Request resolved: pytorch#136 Reviewed By: scotts Differential Revision: D60402239
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Summary: Pull Request resolved: pytorch#137 Pull Request resolved: pytorch#58 X-link: pytorch#58 1. Add CUDA support to VideoDecoder.cpp. This is done by checking what device is passed into the options and using CUDA if the device type is cuda. 2. Add -DENABLE_CUDA flag in cmake. 3. Check ENABLE_CUDA environment variable in setup.py and pass it down to cmake if it is present. 4. Add a unit test to demonstrate that CUDA decoding does work. This uses a different tensor than the one from CPU decoding because hardware decoding is intrinsically a bit inaccurate. I generated the reference tensor by dumping the tensor from the GPU on my devVM. It is possible different Nvidia hardware show different outputs. How to test this in a more robust way is TBD. 5. Added a new parameter for cuda device index for `add_video_stream`. If this is present, we will use it to do hardware decoding on a CUDA device. There is a whole bunch of TODOs: 1. Currently GPU utilization is only 7-8% when decoding the video. We need to get this higher. 2. Speed it up compared to CPU implementation. Currently this is slower than CPU decoding even for HD videos (probably because we can't hide the CPU to GPU memcpy). However, decode+resize is faster as the benchmark says. Differential Revision: D59121006 Reviewed By: scotts
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Summary: Pull Request resolved: pytorch#136 Reviewed By: scotts Differential Revision: D60402239
Summary: Pull Request resolved: pytorch#136 Reviewed By: scotts Differential Revision: D60402239
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This pull request has been merged in 33677b8. |
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This reverts commit 33677b8.
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This reverts commit 33677b8.
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Reviewed By: scotts
Differential Revision: D60402239