[Bf-committers] [Bf-blender-cvs] SVN commit: /data/svn/bf-blender [27404] trunk/blender/release/scripts/ presets/render: A number of common rendering presets, looked up and added by Simon Rainerson

[Tom M]

Note that those PARs are from the ITU 601 standard, and it is
apparently what adobe premiere uses also.

This guy gives an explanation as to why he, and many other encoders
don't follow the spec

http://homepage.ntlworld.com/seemoredigital/03_Video_Only_Info/Why_I_don%27t_follow_ITU601_specification.html

(Note that he has at least two typos in his post that make two of his
calculations wrong, presumably copy paste errors the first NTSC 16:9
should be 40:33; and in the second section it should be 32:27)

LetterRip

On Thu, Mar 11, 2010 at 1:52 PM, Tom M <letterrip at gmail.com> wrote:
> Looks like I opened up a can of worms :)
>
> To answer some questions it appears that there are true pixel aspect
> ratios, and then there are approximate pixel aspect ratios that are
> better for digital video editing software, and the true pixel aspect
> ratios are defined differently by different groups.
>
> Based on my reading it sounds like we should be using the following
>
> NTSC 4:3 -> 10:11
> NTSC 16:9  -> 40:33
> PAL 4:3 -> 12:11
> PAL 16:9 -> 16:11
>
> http://www.mir.com/DMG/aspect.html
> http://en.wikipedia.org/wiki/Pixel_aspect_ratio#Pixel_Aspect_Ratio_of_Common_Video_Formats
>
> LetterRip
>