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 > General > Newbies

Reply
 
Thread Tools Search this Thread Display Modes
Old 6th June 2008, 12:23   #1  |  Link
StickHorsie
Audio Restorator!
 
StickHorsie's Avatar
 
Join Date: May 2008
Location: Alkmaar, Netherlands
Posts: 27
Unevenly spaced duplicate frames, but MultiDecimate doesn't quite cut it

Situation: friend & backup nut, busy restoring huge SF collection from rescued external HDs when a fire broke out. (I've adopted the same system since except for the fire bit - also, I *still* think having 14 external HDs is a bit much.)

"Ewwww... it's jerky!"
"Did you do anything weird with those?"
"No, I just removed the black bars and deinterlaced."
"Ah, a decimate problem. I can fix that." After all, I know just enough of VirtualDub, AviDemux and Very Simple AviSynth Scripts to do a standard decimating job. Besides, apart from the slight jerkiness, her copies were better than the ones *I* had.

Taking a DVDload home for testing, I found that on all files the leftover duplicate frames weren't exactly evenly spaced. So no four frames + one duplicate (which would have been easy), but anything from one to twelve frames before the next dupe. So I did a Google, found MultiDecimate, tried every setting I could think of for the next two days (including some pretty far-fetched & random ones), but none of those took out ALL the "jerks".

When I DGBob'ed a snippet out of curiosity (top first), I noticed that the former odd fields (now: odd frames) were of much lower quality than the former even fields, which might explain MultiDecimate having trouble identifying all the dupes correctly (which is a wild guess. I'm a newbie.)

Anymoo: HALP!!!! (Or: "Ideas, anyone?")

snippet: http://www.megaupload.com/?d=72UXEC4W (39.6 MB, 43" mpeg2, no audio)

Last edited by StickHorsie; 6th June 2008 at 21:45. Reason: typos, catchier title and a little less drama ;)
StickHorsie is offline   Reply With Quote
Old 21st June 2008, 00:51   #2  |  Link
Guest
Guest
 
Join Date: Jan 2002
Posts: 21,923
I got decent results with this:

telecide(post=0)
tdecimate(mode=0,cycleR=32,cycle=154)

You're not going to get perfect results unless you set cycle to the number of frames in the clip and cycleR to the number of actual duplicates. It will be more practical to use a reasonable cycle as I have. You can tweak the numbers to try to improve things.

Note that this will produce a weird frame rate. If you want to go back to DVD, consider using DGPulldown to bring it back to a valid DVD rate. The pulldown will be field based and evenly spaced and it won't get jerky.
Guest is offline   Reply With Quote
Old 22nd July 2008, 00:50   #3  |  Link
StickHorsie
Audio Restorator!
 
StickHorsie's Avatar
 
Join Date: May 2008
Location: Alkmaar, Netherlands
Posts: 27
*several unrelated, but nevertheless very annoying PC problems later* :P

Since we're using the same snippet, I assume I'm making a newbie error with the li'l script I made (OK, maybe I'm supposed to... this *is* the newbie forum, right? ) because it puts the frames totally out of order.

LoadPlugin("D:\Program Files\_plugins\Decomb.dll") -- where telecide comes from
LoadPlugin("D:\Program Files\_plugins\TIVTC.dll") -- where tdecimate comes from
DirectShowSource("O:\video werkmap\andro101_snippet02_43s_noaudio.mpg") -- the snippet
telecide(post=0)
tdecimate(mode=0,cycleR=32,cycle=154)

("werkmap" is Dutch for "job folder") (yes, I have an "O-drive" )
StickHorsie is offline   Reply With Quote
Old 22nd July 2008, 04:20   #4  |  Link
Guest
Guest
 
Join Date: Jan 2002
Posts: 21,923
Don't use DirectShowSource(). Use MPEG2Source() from the DGMPEGDec package. There is a quickstart guide in the zip file to get you going quickly.
Guest is offline   Reply With Quote
Old 22nd July 2008, 14:34   #5  |  Link
StickHorsie
Audio Restorator!
 
StickHorsie's Avatar
 
Join Date: May 2008
Location: Alkmaar, Netherlands
Posts: 27
Only 2 duplicate frames left! (frames 420 & 865)... that's a LOT less, um, duplicate frames!

You, sir, are a genius.

(And I now indeed have a somewhat weird frame rate of 23.7425 fps, but as you already said, that's something that can be dealt with.)
StickHorsie is offline   Reply With Quote
Old 22nd July 2008, 14:56   #6  |  Link
Guest
Guest
 
Join Date: Jan 2002
Posts: 21,923
Quote:
Originally Posted by StickHorsie View Post
You, sir, are a genius.
Not quite, but thanks for that. Also, bear in mind that tritical made the TDecimate filter. Maybe I inspired him a bit with my earlier Decimate().
Guest is offline   Reply With Quote
Old 22nd July 2008, 15:39   #7  |  Link
StickHorsie
Audio Restorator!
 
StickHorsie's Avatar
 
Join Date: May 2008
Location: Alkmaar, Netherlands
Posts: 27
In that case, you're both geniuses.
StickHorsie is offline   Reply With Quote
Reply

Tags
decimate, duplicate frames, jerky video, multidecimate

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 00:36.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.