[FFmpeg-devel] [PATCH 3/6] avutil/hwcontext_cuda: add CUstream in cuda hwctx

Timo Rothenpieler timo at rothenpieler.org
Tue May 8 19:32:12 EEST 2018

>>> What is this?
>> https://docs.nvidia.com/cuda/cuda-driver-api/stream-sync-behavior.html
>> It allows asynchronous processing of CUDA workloads. The next couple
>> patches make use of it.
>> There's no change in behaviour if it remains unset/NULL, but if you set
>> one, the workload won't block the main CUDA stream so you can do
>> multiple transcode sessions in the same application without blocking one
>> another.
> Could probably be documented.
> It seems a bit strange that this is per device. Wouldn't it be per
> operation?

The whole streams thing and its various modes of operation are a bit 
strange. But it does make things faster in certain conditions.

See the whole thread with Oscar Amoros Huguet <oamoros at mediapro.tv> 
about some background on it.

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