about decomb...

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about decomb...

Postby Akashio » Fri Aug 30, 2002 3:19 am

Should I put it in the avisynth code and edit with it in there? or should I add it at the end? or not add it? or what?

I mean, I hear it slows down the whole editing process anyway. I just don't really get *with fear of sounding like a newb* what it does really. Well actually I DO get that it allows you to edit in progressive frames, so i guess my real question is WHY would your average joe need to edit in progressive frames?
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Postby AbsoluteDestiny » Fri Aug 30, 2002 3:27 am

Well, I can tell you now that it will slow things down a lot. You can do the decombing at the end - it works pretty well for that too.

There are some advantages of using progressive frames, I've found:

1) You can slow down and move clips around without having to deinterlace in premiere which is VERY ugly.

2) You can take screenshots of the frame you want without having to find a non-interlaced one. This is good if you add a lot of photoshop work to your amvs.

3) The IVTC process will be more sucessful before you edit and progressive frames are what most people want.

However it has the following disadvantages:

1) You can't edit in Premiere at 23.976fps. If you want to use the correct timebase, you have to edit at 24fps which is ok (especially if you make your avs files run at 24fps) but it's much easier to restore to NTSC if you can do 23.976. [hint - you can do this anyway by changing the length of your audio, see my audio guide]

2) It is slow.

However, to overcome the speed problem, I generally make easily editable avis based on my avisynth files. I then swap the files at the end to get the best quality encode. I'm writing a guide on how to do this for the next update of the video guides.
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Postby Akashio » Fri Aug 30, 2002 4:14 am

AbsoluteDestiny wrote:1) You can slow down and move clips around without having to deinterlace in premiere which is VERY ugly.


Can't you just uncheck the little box in the Video Advanced menu? and wouldnt you have to do that no matter what source you had anyways?

Absolute Destiny wrote:2) You can take screenshots of the frame you want without having to find a non-interlaced one. This is good if you add a lot of photoshop work to your amvs.


Why can't you just add "Bob" to your script? Alot of DVD player applications use that exact script code to deinterlace video.

Absolute Destiny wrote:3) The IVTC process will be more sucessful before you edit and progressive frames are what most people want.


The IVTC process will be more sucessful before you edit... I dont follow you there...
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Postby ErMaC » Fri Aug 30, 2002 5:24 am

Akashio wrote:Can't you just uncheck the little box in the Video Advanced menu? and wouldnt you have to do that no matter what source you had anyways?

The difference is if you turn it off when you slow down interlaced footage and then try to output it to a video monitor - it skips around because it repeats interlaced frames. There a reason Premiere enables that option by default - people who target NTSC or any other interlaced medium need to slow down a progressive source or else you get skipping.
Akashio wrote:Why can't you just add "Bob" to your script? Alot of DVD player applications use that exact script code to deinterlace video.

Because Bob sucks. First off Bob in an AVIsynth script will turn it into a 59.94fps video stream, and that would be dumb to edit with.
And FYI DVD apps that use Bob to deinterlace generally look like crap. My little laptop here bobs on interlaced DVDs and I find it almost unwatchable. Interpolation algorithms are far better.
Akashio wrote:The IVTC process will be more sucessful before you edit... I dont follow you there...

Simple - when you're IVTC'ing a stream which hasn't been edited or messed with then you have a much better chance of doing it correctly. A very evenly-telecined piece of footage will wind up almost flawless using DeComb. However, once you start editing with your footage in 29.97, inserting cuts on that timebase, and generally doing what an AMV editor does, then DeComb's job becomes much harder. DeComb's meant to reconstruct a 24fps stream from what was originally a 24fps stream. After editing in Premiere it is no longer a 24fps stream because all the cuts and fades and whatnot have been made on a 30fps time axis.
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Postby dokidoki » Fri Aug 30, 2002 5:20 pm

ErMaC wrote:Because Bob sucks.

Bob doesn't suck! Bob's a nice guy! I like Bob! </JessicaCalvello>
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