On Jul 28, 09 11:28:07 -0700, Yang Zhao wrote:
Ok, still the 4:3 720p is an argument. So probably something like width >= 1200 || height >= 700 would be reasonable (and account for some weird broken overscan possibilities).
I'm not sure 4:3 with 720 lines is an accepted common resolution. It's certainly not part of ATSC.
Good question.
My primary intention with checking only the width is to handle media that's been cropped from a 720p source to get rid of letter boxing.
4:3 could result of cropped video from 720p source as well. IMHO something like my test above would deal with all known good resolutions, but...
This is not uncommon for cinema in 1.85:1 and 2.39:1. To add to the confusion, I have media labelled as "HD" at 960x544 which is stretched to 1280x544 using Xv, which is then used as the effective resolution of the video.
Eeck, yes. Similar to 1440x1080 streched to 1920x1080, I assume. I have *no* idea how to deal with that, and whether that's a reasonable medium to assume to be recorded with Rec. 709 in mind.
I also remember that there was a color space that used the full 0..255 range for Y, but I don't know its specification number. xvYCC? http://en.wikipedia.org/wiki/XvYCC
Could be.
I'm not sure if it's actually in common use. Easy to add, if it has
I had one file once, that's as much as I know.
the same conversion constants as Rec.709.
I'm not exactly sure - the range 0-15 must change the scaling factors.
Also, as long as we don't know the color range of the monitor, this
discussion is probably pretty moot.
CU
Matthias
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Matthias Hopf