Fix video backward seeking / stepping back sometimes getting stuck (in the presence of b-frames) #8053
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| @@ -104,9 +109,23 @@ impl SamplesStatistics { | |||
| .iter() | |||
| .all(|s| s.decode_timestamp == s.presentation_timestamp); | |||
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| let mut biggest_pts_so_far = Time::MIN; | |||
| let has_sample_highest_pts_so_far = samples | |||
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I'm also a bit worried about how many times we're iterating over the samples here. I don't think LLVM will optimize this to one loop.
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tbh I'm not sure if it's better to combine everything to a single loop or to loop several times: individual loops might vectorize better
pure speculation until someone actually measures. Maybe I should. After all we might run this with a lot of samples!
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It optimizes a lot better than I thought: https://godbolt.org/z/n3Yvzff9e
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neither is in the mood for simd though. probably because everything is 64bit integer
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leaving it be as is for now
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known issue on |
What
Our PTS -> sample search algorithm wasn't quite right. Fixed this here and added a unit test.
Unfortunately, I had to introduce a small auxiliary data structure to keep this snappy / not O(n) for n samples, but it's very simple and rather contained.
Tested on native & web. Web still suffers from
but on Chrome this works fine now!
Screen.Recording.2024-11-08.at.16.55.06.mov
Checklist
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