NTSC DV aspect ratio, again (sorry!)

Gammaburst wrote on 6/23/2002, 8:49 PM

I know this topic has been discussed to death, but I believe VV3 uses the wrong value for NTSC DV pixel aspect ratio. I believe the correct value is 72/79 and not 10/11. The ratio 10/11 is merely the conversion factor between NTSC DV and D2 "industry standard" square pixels. However "industry standard" square pixels are not square, they are 396/395! NTSC DV's true pixel aspect ratio is 72/79 --- or is my brain damage flaring up again? :-)

Here's an excellent reference:
http://www.uwasa.fi/~f76998/video/conversion/

I can't find the key article referenced in this message:
http://www.sonicfoundry.com/forums/ShowMessage.asp?ForumID=4&MessageID=81847

Comments

SonyDennis wrote on 6/23/2002, 11:54 PM

Gammaburst:

Thanks for the article, I hadn't seen that one.

Of course, it's not a specification, just someone's opinion. Interestingly, after dozens of people telling us the pixel aspect ratio in Vegas should be *lower* than 0.9091, here you are telling us it should be *higher*!

Fortunately, since the value you're asking for and the value we ship with are within a quarter of 1 percent of each other (and less than 1 pixel per side in physical width), I don't think you have anything to worry about.

Don't forget what the last line of the article says "Feel free to process your video just the way you like it." -- if you'd prefer 0.9114 to 0.9091, then feel free to change it for your projects, that's why it's an editable value.

///d@

Gammaburst wrote on 6/24/2002, 12:44 AM

Yes, for most folks, the difference is small enough to be academic.
Thanks for making it easy to change the setting to whatever we need. :-)