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ffmpeg/libavfilter
Philip Langdale 71e5dfbf89 avfilter/fruc_vulkan: expose optical flow perf level and grid size
Add the two options that tune the NV optical flow session:

* perf: performance level (slow/medium/fast), previously hard-coded to slow.
  Trades motion-estimation quality for speed.
* grid: output grid size in pixels (auto/1/2/4/8), previously always the finest
  grid the device supported. A coarser grid computes fewer flow vectors, so it
  is faster and uses less memory at the cost of detail.

These settings are important as you can't handle high resolution input in
realtime at the highest quality settings. For example, 2160p24 movie content
needs reduced settings (eg: pref=medium,grid=2) for the filter to run
comfortably.
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