[opendtv] Re: BBC Demonstrates HDTV Broadcasts over SD Channels
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 21 Jun 2005 21:53:19 -0400
John Willkie wrote:
> Uh, tom, just how will those affordable 1080p pictures be delivered to
> people? In other words, what type of transport streams?
>
> Are you familiar with the fact that 1080p uses more samples per second than
> is permitted by MPEG-2 transport streams? (that being just under 63 MM
> samples per second)
>
> Could you point me to the affordable transport streams that will handle this
> format?
>
> John Willkie
You have been singing the glory of MPEG-2 transport streams and
then point out they can't handle 1080p. Happily however you are
wrong since even ATSC allows for 1080@24 (and 30) which will
likely (in some form) be one of the HxDVD standards and most
efficient for encoding movies.
It is only 1080p @ 60 that is too fat for ATSC transmission and
even that format could probably be done in HxDVD (but won't).
- Tom
> ----- Original Message -----
> From: "Tom Barry" <trbarry@xxxxxxxxxxx>
> To: <opendtv@xxxxxxxxxxxxx>
> Sent: Tuesday, June 21, 2005 4:33 AM
> Subject: [opendtv] Re: BBC Demonstrates HDTV Broadcasts over SD Channels
>
>
>
>>At a viewing distance below about 2 screen widths some people
>>might want to consider 1080p as it becomes affordable. And at a
>>viewing distance above 3 screen widths 480p might be enough for many.
>>
>>But 720p is probably just perfect in between. ;-)
>>
>>- Tom
>>
>>
>>Craig Birkmaier wrote:
>>
>>
>>>At 12:27 PM -0400 6/20/05, John Golitsis wrote:
>>>
>>>
>>>>Now isn't that just so very conclusive! ;)
>>>>
>>>>On 20-Jun-05, at 8:57 AM, Craig Birkmaier wrote:
>>>>
>>>>
>>>>
>>>>>For larger screens, up to 50", 720p with 1,280 pixels per
>>>>
>>>>>line was considered ideal.
>>>>
>>>
>>>I don't know about conclusive, but "logical" comes to mind.
>>>
>>>At least the Europeans have had the benefit of learning from our
>>>experience with HDTV...
>>>
>>>Then again, they had experience with interlaced HDTV before we even
>>>had a digital HD standard in the U.S. As I remember they found
>>>1250/50i to be less than optimal, so they killed it.
>>>
>>>Regards
>>>Craig
>>>
>>>
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