Wrong Height

[fig]

My VOB's list the height as 480. The actual height is 405. It's a 16:9 film, 720x405. Yet anything that plays the dvd shows a 480 height. They display 405 pixels of video, but still list the height as 480. This screws with dvd2avi, as it FORCES the 480 height by stretching the video. I tried hex'ing the VOB's to force them to read a 405 height. Worked, but, screwed the video over completely. Cut off the bottom 75 pixels and stretched what was left. *Shrug* Any tell me how to fix this? Video is "Pay it Forward" in case anyone's heard of similar problems/fixes.

[Kedirekin]

I'm surprised no one else has responded to this.

All NTSC DVDs are 720x480. And there are only two display aspect ratios (DARs) supported in the spec: 4:3 and 16:9. There are a number of things studios do in authoring to achieve the correct aspect ratio on playback - for example, they can encode it at 4:3 with large black bars to give a playback aspect ratio of 1.85:1.

It sounds like you have a DVD encoded at 16:9 with medium black bars to get a playback aspect of 2.1:1 (16/9*480/405=2.107).

[fig]

That's the trouble, forgot to mention it; there're no black bars on my video to actually have 480 pixels. The video is only 405 pixels deep. I took a screenshot and measured it.

[Kedirekin]

Forgive me, but I'm confused. What did you take a screen-capture of - playback in a software DVD player?

If so, be aware that software players resize on playback so that you can watch the movie they way it was intended to be viewed. An anamorphic 16:9 DVD can display at 720x405 (which I think is what you're seeing), or 800x450, or just about anything.

You said that dvd2avi 'stretches' the video to 480, but since the video is in the vobs at 720x480, it's actually not resizing at all. This is the way dvd2avi is supposed to work - we don't want it to resize anything (unless we tell it to).

[fig]

Software DVD player, wmplayer, and bsplayer. They all show the video as being 405 pixels high, not 480. There're no black bars on the "avi" that dvd2avi builds, either, as displayed by wmplayer. just the "center" data, stretched to 480 pixels.

No matter, though; rather than SBC divx3 with Nandub, I'm using divx4 with Flask. Flask, after much tweaking with the size and cropping, seems to have no trouble with it.

Love to know how to fix this, though (I don't like divx4). I'd be willing to send you part of a VOB if you'd like to try it out.

[Kedirekin]

Glad FlasK works for you.

Just to clarify, there isn't anything wrong with your vobs or with dvd2avi. In that vast majority of cases, resizing is a natural part of the re-encoding process. Software DVD players, and FlasK, take care of this minor detail automatically (well, mostly they do). In most other approaches, you need to get more directly involved.

I recommend you spend some time reading the doom9 guides. You'll find a link at the top of these forums.

[Messerjockel]

Hi
Some people reported incorrect aspect ratio's
One way is to use fi THE PLAYA (set to 16:9)

MfG