[FFmpeg-trac] #7563(undetermined:new): hwaccel nvdec consumes much more VRAM when compared to hwaccel cuvid

[FFmpeg]

#7563: hwaccel nvdec consumes much more VRAM when compared to hwaccel cuvid
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             Reporter:  malakudi     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by oromit):

 nvdec keeps more of a buffer, because it hands through the directly mapped
 frames from the driver. While cuvid makes a vram-internal copy, and thus
 can work with a minimal buffer and potentially zero copies all the way
 through nvenc.
 There's not much that can be done about that difference, as the buffer is
 needed for decoder and filter chain to not run out of frames in the
 predicted worst case scenario.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7563#comment:1>
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