Clever Anamorphic for Blu Ray Rips

[donfrenchiano]

I see a lot of debate about people converting DVDs to x264 mkv encodes and using the CAE option in Megui. What i want to know is if it is beneficial to do the same with a blu ray. I will be encoding them to x264 MKV encodes as well and will be resizing them to 720p (1280 x 720 or something close depending on whether it needs cropping or not). Should i even bother with this.

[nurbs]

Blu Rays aren't anamorphic.

[donfrenchiano]

But if you're cropping and resizing wont the AR change slightly and CAE stretch it to the correct AR

[Ghitulescu]

But if you're cropping and resizing wont the AR change slightly and CAE stretch it to the correct AR
Define correct AR.:rolleyes:

[nurbs]

If you resize to mod16 the error will basically always be less than 1%.
I would expect about 0.5% in the typical case and that can be reduced to 0 if you crop about <=8 additional pixels. With your 720p resolution that means you'll be about 4 to 6 pixels off on a typical video. It's unlikely that you could tell the difference.

If you don't resize to mod16 the error will be even less than that.

[hello_hello]

Trouble is, if you don't use anamorphic encoding, MeGUI forces you to stick to mod16 dimensions when resizing. You could always change the script manually, I guess. Try this resize calculator: http://www.mediafire.com/?airxmp5qrtcbw2j

Setup your encode using MeGUI and apply the required cropping and resizing, then use the calculator to fine tune the cropping for minimum picture aspect ratio distortion. The calculator will automatically resize to the nearest mod16, mod4 or mod2 height (whichever you decide to use) and calculate the amount of distortion as you adjust the cropping. Then apply your adjusted cropping to MeGUI. If you don't use mod16 dimensions, you can change the resizing in the script manually.

I don't actually know if there's any real disadvantage to using anamorphic encoding for Blu-ray encodes, especially if you're already resizing anyway, but square pixels do seem to be the norm.

Define correct AR

That'd be the same "picture" aspect ratio as the original. ie not distorting the shape of objects in the video itself when resizing. I would have though that was fairly obvious. .:rolleyes:

[Sharc]

One can produce compliant anamorphic blu-ray encodes by resizing the original (non-anamorphic) 1920x1080 to 1440x1080 and set --sar 4:3