[opendtv] Re: BBC Demonstrates HDTV Broadcasts over SD Channels
- From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 23 Jun 2005 10:33:33 -0400
What you say in this message has nothing to do with the Rec. 601 rise
times in your previous message.
TTFN,
Mark
Craig Birkmaier wrote:
>At 8:32 AM -0400 6/23/05, Mark Schubin wrote:
>
>
>>Correct. And both 720 and 480 are divisible by 16. So the divide-by-16
>>argument doesn't make sense.
>>
>>
>>
>
>Arguably true. But one can go a step further and consider the impact
>on the color components of the source. 720/2 = 360. This is the
>resolution of the color difference signals.
>
>360/2 = 22.5 macroblocks, so some padding is required as is the case
>with 1080 into 1088.
>
>704/2 = 352
>
>352/16 = 22
>
>This is the major reason most MP@ML encoding use 704 or 352 samples per line.
>
>Regards
>Craig
>
>
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