[opendtv] Re: Case for 720p60
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 20 Apr 2010 10:44:41 -0400
I think ATSC table 3 contains 704x480p at all standard frame rates. I
believe Fox first used that before going 720p.
- Tom
Craig Birkmaier wrote:
> At 11:09 AM -0500 4/19/10, Manfredi, Albert E wrote:
>> Craig Birkmaier wrote:
>>
>>> What is lacking here is any discussion of the fact that most folks
>>> are still watching, and most stations are still broadcasting
>>> interlaced SDTV...
>>
>> In ATSC-land, where there are no MPEG-2 MP at ML restrictions, in
>> principle at least, broadcasters could begin to transmit SDTV as
>> 480p24 or 480p60. So why don't they?
>
> The only 480p format that could be used is square pixel 640 x 480 with
> a 4:3 aspect ratio. The ATSC does not support 854 x 480p or
> 704/720x480p. These formats are supported by MPEG-2 at various levels,
> but there is no guarantee that all ATSC receivers will display them,
> so broadcasters do not use them.
>
>>
>> One of the NBC4 subchannels is Universal Sports, now using 480i. It
>> probably doesn't make sense to try using 480p24 for sports, so they
>> would have to use 480p60. If it's true that MPEG-2 compression is so
>> much more efficient in progressive mode, are the advocates of
>> progressive saying that the US subchannel could be transmitted as
>> 480p60 over the same ~2.5 Mb/s channel now used for 480i?
>
> Sure, but only using ATSC approved formats as described above.
>
> Regards
> Craig
>
>
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