what is 1.296 aspect ratio?

[blake3]

this is the ratio as reported by media info lite .7:

Display aspect ratio : 1.296

im having trouble with squashed video trying to put an mp4 on dvd.

both the mp4 & the converted mpg have this aspect ratio as reported by media info lite.

seems like its supposed to be 4x3 or 16x9?

[paradoxical]

It means that the aspect ratio is being signaled as 1.296. Which probably means the AR as signaled in either the video stream or the container was set incorrectly. Remux the file to correct this.

[SeeMoreDigital]

this is the ratio as reported by media info lite .7:

Display aspect ratio : 1.296

The number 1.296 is very close to 1.333, which equals 4:3 (ie: 4 ÷ 3 = 1.333).


Cheers

[StickHorsie]

First, you'll need to know which display aspect ratio it's supposed to have (probably 4/3 or maybe 16/9 or maybe maybe even 1.85). If you play the mp4 with MPC Home Cinema (available here (http://sourceforge.net/projects/mpc-hc/)), you can experiment with the numerical 4 and 6 keys to make it squashier and wider, until it looks good. The aspect ratio is displayed at the bottom of the player.

Then demux (split into audio & video tracks) the mp4 with (for instance) YAMB (http://yamb.unite-video.com/), and mix these tracks into a new mp4 ("remux") after setting the correct aspect ratio in the "Properties" tab of the video track. An mpg made from the new mp4 should now also have the correct display ratio.

[blake3]

the mp4 or converted mpg looks ok when played on computer (i use vlc but i'll give mpc a try).

Its when i write the mpg to dvd (using videoredo) that the aspect ratio gets screwed.

i also made a dvd from the mp4's using dvdflick which came out fine except I can't find out what that program is doing with the aspect ratio, unfortunately, its abandonware.

id just use dvdflick fot the dvd's except the files need editing to cut commercials first so I have to get them into mpg format.

[blake3]

tried 4:3 & it looks better.

out of curiosity, is there a formula for translating the decimal expression of resolution as reported by media info (ie 1.296) to the more usual way of expressing aspect ratio, ie 4:3=1.33 so x:y=1.296.

how would one derive x & y?

[nixo]

http://www.mindspring.com/~alanh/fracs.html

--
Nikolaj

[blake3]

Nixo, that's pretty slick, thanks.

[StickHorsie]

tried 4:3 & it looks better.

I expected as much. ;)

Aspect ratios "somewhat below 1.33" usually happen when black bars (8 to 16 pixels) at the left & right side of a 4:3 video are cropped away while it's really supposed to be 4:3 *after* cropping.

P.S. An easy tool to restore squashed avi files to 4:3 without re-encoding is the MPEG4 Modifier, available here (http://moitah.net/).