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Old 18th December 2020, 21:36   #21  |  Link
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If that's the case for all dedup algs (is it?) then they have to have a stop limit.
Forego quality for speed. :-(
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Old 18th December 2020, 22:22   #22  |  Link
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I got your PM but cannot contribute anything to this thread.
I only recompiled ExactDedup, fixing some problems related to different compiler and x64 campatible compile.
I have never touched VFR myself.
I sometimes post sober.
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"Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???
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Old 18th December 2020, 22:42   #23  |  Link
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Originally Posted by nji View Post
If that's the case for all dedup algs (is it?) then they have to have a stop limit.
Forego quality for speed. :-(
There are various decimation filters, and decimation with automatic compensatory timecode output for VFR . Dedup falls in the latter category . I don't think there are any others like dedup for avisynth

I think understand about the "sliding" comment. There are are accruing differences each frame , n+1,n+2,n+3 that you lose comparing to the original n frame. The definition gradually changes, and you're not really comparing n+10 vs. n.

I don't think any algorithm stores a frame in memory to be able to compare a frame 10, or 20, or 100 frames down the line.

But "quality" or more accurately described "accuracy" is definitely an issue. It's difficult to measure similarity (the grey area mentioned earlier) . You can have subtle x,y translation shifts in the frame during film transfers, sometimes 1 pixel or even subpixel, that register as different, but it's clearly meant to be a duplicate. PSNR is classically fooled by that. You can have clearly duplicate frames, but grain or noise pattern added on top makes them "different" to algorithm
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