This is a little pedantic, but vertical resolutions in interlaced formats must be divisible by 32. Ron John Willkie wrote:
There aren't any MPEG-2 video formats. Why do you persist in this unfounded constraint year after year? But there are SMPTE video formats, which are recommended but not required in the A/53. MPEG-2 provides how to compress video in ISO/IEC 13818-2 (aka MPEG-2 video) Of course, if you actually knew something by reading 13818-2, instead of merely opining about it, you would know that neither 200 or 600 is divisible by 16 and that a frame rate of 69.48 is not possible per MPEG-2. MPEG-2 video display sizes have to be divisible by 16. For example, 1920 x 1080 is actually 1920 x 1088. ATSC attempted to add additional constraints that favored IP held by certain Japanese vendors. Funnily enough, I learned this on this list since you have been a member. The FCC rejected this constraint. John Willkie-----Original Message----- From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of Manfredi, Albert E Sent: Wednesday, February 14, 2007 2:56 PM To: opendtv@xxxxxxxxxxxxx Subject: [opendtv] Re: Food for thought Mark Schubin wrote:http://displaydaily.com/page/2/ If this doesn't show the February 12 edition, go top the bottom and click "Previous" until you get it.Seems like a reasonable column. However, the funny part is, "damned if you do and damned if you don't." Mr Cugnini makes the point that the "infamous Table 3" is not included, so presumably it's okay to decode only, say, tall and skinny images 200 X 600 images transferred at 69.48 frames per second, interlaced. I suppose the FCC could have stipulated "all MPEG-2 formats," or some such, but it didn't, and I continue to contend that would have been unreasonable. Just asking for sync-up problems. Seems much like the aspect ratio debate. After all the pointless yelling, what the Grand Alliance had suggested is what got implemented, with the addition of legacy 4:3 and SD modes. Bert
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