Anamorphic DVDs

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Anamorphic DVDs

Postby Atarashii Hito » Mon Aug 26, 2002 4:12 pm

I am trying to get footage off of the Spriggan DVD and the dvd appears to be an anamorphic transfer. Now I ripped the DVD using the guide but when I import the .vob files into DVD2AVI it smushes the widscreen into a plain TV resolution. I was just wondering how to get about to ripping this dvd the right way.
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Re: Anamorphic DVDs

Postby AbsoluteDestiny » Mon Aug 26, 2002 5:00 pm

Atarashii Hito wrote: it smushes the widscreen into a plain TV resolution.


That's what anamorphic is. It maximises the resolution to give better quality.

If you want to correct the aspect ratio, you'll have to do it after you've edited the video.
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Postby Atarashii Hito » Mon Aug 26, 2002 5:22 pm

Well then, how would I go about correcting it? Would I just select the widscreen profile at the begining when Premiere starts up?
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Postby jbone » Mon Aug 26, 2002 8:12 pm

No, you don't understand. Edit it as it is, and then once it's finished and exported, correct the aspect ratio.
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Postby klinky » Mon Aug 26, 2002 8:17 pm

Coldn't he resize in his AVISynth script. Probably would want to IVTC it if it's not already at film rate.

I would find it a pain to edit with squished video..

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Postby Atarashii Hito » Mon Aug 26, 2002 8:39 pm

Well, I really shouldn't need to IVTC it because in DVD2AVI I put forced film... Maybe I don't understand this as well... And also doesn't the decomb filter fix this anyways cause I can add that in too. But how would I go about fixing the aspect ratio after or before as klinky mentioned? I wish I knew more about what I was talking about...
Help!
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Postby klinky » Mon Aug 26, 2002 8:47 pm

In the AVISynth script add the line:

BilinearResize(xxx,yyy)


Adjust the size according to the aspect ratio.


For a list of possible resolutions check here :
http://www.doom9.org/bitrate_guide.htm#res


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Postby Atarashii Hito » Mon Aug 26, 2002 9:28 pm

Well ok, that’s easy enough, just here’s another thing to throw up, er…I mean out. Is that this is going to be a "various" AMV, meaning there’s gunna be a lot of different Anime to work with... And this is really the only anime that's widescreen. So I'm just wondering since I have to resize the preview screen to 720*480 for the rest of my DVDs, how will I go about viewing the widescreen in premiere? Will I just leave the window size to 720*480? 'Cause that’s the only way I know how it will show up.
I know this is complex but thanks for all your help.
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Postby klinky » Mon Aug 26, 2002 11:16 pm

That is a pickle :(


Well you should probably resize all your footage to the proper aspect ratio.Then add a new letter box to footage that does not fill the entire screen. I would work within Premiere probably @ 640x480, if you have a bunch of more 4:3 footage then letterboxed.


Then take your Spriggan DVD into virtual dub(via the AVS). Resize it according to the aspect ratio. When you resize there is a option there to expand frame and add letterbox. Add enough height width so it matches up with the 640x480 project. Then cut out clips and save as huffYUV, then import that to Premiere.

This probably could also be done directly with AVISynth, but it's probably conplex and would be cpu intensive.


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Postby AbsoluteDestiny » Tue Aug 27, 2002 4:31 am

My solution to this problem would be to make the widescreen footage 4:3 by resizing the source horizontally and clipping the edges like so:

BicubicResize(960,480)

Thern cropping 120 off left and right. This command has changed recently so it will depend on the version of avisynth you are using. See the help file for details.

Anyway, this will basically pan and scan your footage. Also, because it's just a horizontal resize it wont effect the interlacing. It will also avoid black bars in your video so it will all look the same.
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Postby ErMaC » Tue Aug 27, 2002 9:06 am

I was about to suggest the same thing. However the syntax for AVISynth is still the same if you use positive numbers I believe - if you stick negative numbers into the latter 2 parameters you get VDub-style crop, positive #'s you get AVISynth style crop.

What you want to do in your script is:

BicubicResize(960,480)
Crop(120,0,720,480)

That will give you pan&scanned footage.


However - you said you're using ForceFilm. Unless ALL the footage that you're using in your video is ForceFilmed (or at 23.976FPS) then you will be working with varying framerates and that is BAD.

My recommendation is just edit it interlaced in 29.97 to match the rest of your footage. There's only a handful of DVDs that ForceFilm will work properly with, most of the time you need to use DeComb in order to get real IVTC results.
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Postby Atarashii Hito » Tue Aug 27, 2002 12:53 pm

Wow ok. This is lot to take in ^_^; So I will add the pan & scan script into my widscreen .avs and also then instead of doing ForcedFilm I should just use the decomb filter? Have I got all this right?
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Postby ErMaC » Tue Aug 27, 2002 1:48 pm

Well, only use the Decomb filter if ALL Your footage is being put through the Decomb filter.

However realize you will run into problems editing with 23.976fps footage in Premiere since it doesn't support that framerate and doesn't have a timebase for it.

I recommend ediitng in 29.97 with everything.
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Postby klinky » Tue Aug 27, 2002 3:48 pm

:oops: :oops:


The only thing that Klinky doesn't like about using AviSynth is each time you preview something it's going to get reprocessed through the filters you applied in the script.

I know AVISynth saves rendered frames in virtual memory, but that usually fills up quick, so I am pretty sure not all the frames are going to be kept and alot of the time are going to go back through the filters again.

If he just got the clips he needed out of VirtualDub(w/ proper filtering) and imported those. Then he'd have the clips ready to go in a 'local' avi format, and they wouldn't keep going through a Resize and Cropping filters every time he tries to access a frame.


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