Video Resolution doesn't make sense

[Error]

Sorry I had no idea which forum to post this in since it could fall under many categories. Anyway here is something I am not understanding.

Say I have an NTSC DVD that is a 4:3 AR whose resolution is 720x480. The video when viewed fullscreen takes up the entire screen with no black bars.

Now when I take that video and use it with avsynth with OUT cropping or resizing it it no longers fills the full screen. I now have black bars at the top and bottom and the AR appears to be way off. I see some stretching when there shouldn'y be any.

I have tried to encode from a DVD source before without cropping or resizing and this happens to me everytime. How can the video appear so different when I have made 0 changes to the resolution or aspect ratio?

[setarip_old]

Hi!

Isn't this the same (or extremely similar) to the question you posted in January? (Click on the following link)

http://forum.doom9.org/showthread.php?t=120189

[SallyDog]

I guess he never really got the answer he was seeking.

[Error]

I have asked that here before. Im sorry guys/gals for this. This has been on my mind for awhile now. Sorry that it slipped my mind.

EDIT: Funny that you remembered I did when I don't. Anyway I guess I never did figure out how to specify the AR with megui.

[Guest]

@Error

Don't use profanities on this forum, or you'll be struck.

[Error]

Sorry sir... OK I have found that I can specify the AR when encoding to x264 with megui. Are those values respected by all of the major media players such as WMP, MPC, VLC, etc?

[mjr4077au]

It's related to what the container supports. I believe even AVI supports anamorphic resolutions. Anamorphic resolutions is fully supported in Matroska and even Windows Media Player 6.4 will handle it.

[zambelli]

The problem with PAR metadata in AVI (using RIFF) is that the default AVI source filter doesn't propagate that metadata to the VideoInfoHeader2 structure in DirectShow, thus disallowing downstream filters from knowing the video is anamorphic.

[mjr4077au]

The problem with PAR metadata in AVI (using RIFF) is that the default AVI source filter doesn't propagate that metadata to the VideoInfoHeader2 structure in DirectShow, thus disallowing downstream filters from knowing the video is anamorphic.

Ah, I didn't know it was probmatic, I use Haali for AVI splitting.

[fitbrit]

Just a quick note: 720x480 is 3:2, not 4:3. 3:2 is "DVD widescreen". 4:3 would be 640x480.

[zambelli]

3:2 isn't DVD widescreen. DVD widescreen is 16:9.

3:2 is simply the physical (square pixel) aspect ratio of the NTSC image including overscan. It represents both 4:3 and 16:9 display aspect ratios in the DVD spec.