#8396: hwdownload always use 0th device (hwaccel_device 0)
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Reporter: darn | Owner:
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution:
Keywords: nvenc | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by oromit):
hwdownload copies frames _from_ the device, and thus uses the context of
the frames it gets as input. The outcoming frames are in system RAM and
not tied to any device.
The second CUDA context on the default device (0) you are seeing is nvenc
getting fed non-CUDA frames, which triggers it to create its own CUDA
context to re-uploads the frames on.
nvenc has its own option (-gpu) controlling on which device it creates
that context.
But really, why even download in the first place, just for nvenc to re-
upload immediately?
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Ticket URL: <https://trac.ffmpeg.org/ticket/8396#comment:2>
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