[Bf-funboard] Render Buttons proposal

[Luke Wenke]

http://www.uwasa.fi/~f76998/video/conversion/#conversion_table
http://www.motionlink.com.au/pages/dvd_info/features_func.html
The NTSC DVD format seems to be 720x480 (and occassionally 702x480)

http://www.videoessentials.com/DVEQ&A.htm#video
"3)...In the NTSC DVD format the Overscan pattern has been built to the
program production standards as specified in the SMPTE Recommended Practice
(RP) document number 187. It specifies that the digital pixel area is 720 by
486. The digital pixel specification for DVD is 720 by 480. That suggests
that at least six lines in the vertical direction are going to be lost
between the production format and the DVD itself.....When MPEG encoding came
along for digital video it worked on even multiples of 16. The number 480 is
the closest multiple of 16 to the production format of 486."
That's because MPEG-2 (DVD compression) is a JPEG-type encoding that divides
the picture up into blocks and sub-blocks.

See also sections 4.5 and its subsections:
http://www.uwasa.fi/~f76998/video/conversion/#faq

So support for 720x486 isn't that important (if you want to do DVD's and DV
at least) but if anyone requests it, it could be made into a default... or
they could just add the preset themselves...

BTW, this has some more image formats: (it doesn't have pixel aspect ratios
though)
http://astronomy.swin.edu.au/~pbourke/dataformats/imagedim/

- Luke.

----- Original Message ----- 
> Oh yeah, you seem to know a bit more about video/TV
> formats, ofcourse they will have to be exactly
> correct. I was just taling about the idea of those
> formats. There must be somewhere on the web or
> something where you can get it exactly right. But why
> not include the NTSC DVD format? I know its very close
> no regular NTSC, but even six pixels make a difference
> in the end. You would want to get it exactly right.