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Dana Feng 63822ae21f vf_mpdecimate: Fix keep option logic for keep > 0
Fix the following issues with the keep option:

- Add similarity check during keep period. Previously, the code
  returned early during the keep period without checking if the
  frame is actually similar to the reference.

- Reset keep_count on different frames. Previously, the counter
  could accumulate across non-consecutive similar frames, causing
  frames to be dropped earlier than expected.

- Keep the same frame reference if appropriate. Previously, the
  code made similar frames the new reference, causing reference
  drift and gradual scene changes.

Signed-off-by: Dana Feng <danaf@twosigma.com>
2026-04-05 00:26:55 +00:00
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