VirtualDubMod vertically stretching video from M2V

[Yarko1967]

Hi all,

I have a couple of questions about VirtualDubMod.

I am trying to convert an M2V file containing a DVD video stream from an NTSC DVD (720x480, pixel aspect ratio 32:27, display aspect ratio 16:9) into a lossless AVI using the Lagarith codec. However, VirtualDubMod gives me a video that, when played, seems to be stretched vertically. When I view the output video in GSpot, I see that it is 720 x 480, but it has a pixel aspect ratio of 1:1. Is this why it seems stretched? I have tried to search for other people having this problem but I haven't been able to find a solid explanation of why this happens and how to fix it.

Also, I notice that the output file has a pic rate and frame rate of 23.976, where the original M2V had a pic rate of 23.976 and a frame rate of 29.970. I suppose that doesn't matter much since the differing pic rate and frame rate only mean that some of the frames are duplicated. Will this present any problems with editing?

[manono]

VDub(Mod) shows you the M2V exactly as it is stored on the DVD, before the resize. If you want to see it look 'normal' - as it would look when played in your DVD player or played by just about any software player - then right-click on the VDubMod screen and change the aspect ratio to 16:9.

I have tried to search for other people having this problem

There is no problem. Once you reencode it for DVD and as 16:9, it'll look OK again.

Also, I notice that the output file has a pic rate and frame rate of 23.976, where the original M2V had a pic rate of 23.976 and a frame rate of 29.970.

VDubMod ignores the pulldown flags that tell the DVD player how to output interlaced 29.97fps.

I suppose that doesn't matter much since the differing pic rate and frame rate only mean that some of the frames are duplicated.

Some of the fields are duplicated. Less jerky that way.

Will this present any problems with editing?

No. It all becomes good again when you encode for DVD as progressive 23.976fps and 16:9 with 3:2 pulldown applied.

[Yarko1967]

Thank you very much for the information!