Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > Capturing and Editing Video > VirtualDub, VDubMod & AviDemux

Reply
 
Thread Tools Search this Thread Display Modes
Old 18th December 2020, 21:36   #21  |  Link
nji
Registered User
 
Join Date: Mar 2018
Location: Germany
Posts: 161
If that's the case for all dedup algs (is it?) then they have to have a stop limit.
Forego quality for speed. :-(
nji is offline   Reply With Quote
Old 18th December 2020, 22:22   #22  |  Link
StainlessS
HeartlessS Usurer
 
StainlessS's Avatar
 
Join Date: Dec 2009
Location: Over the rainbow
Posts: 9,755
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.
StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace

"Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???
StainlessS is online now   Reply With Quote
Old 18th December 2020, 22:42   #23  |  Link
poisondeathray
Registered User
 
Join Date: Sep 2007
Posts: 4,771
Quote:
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
poisondeathray is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 13:48.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.