[opendtv] Re: Why Europe should choose 720P for HDTV
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 12 Dec 2004 13:24:00 -0500
Of course it depends upon where you live but the Fox network since
September has been everything in 720p, encoded at a bit rate suitable
for splicing without re-encoding. For instance it's 720p here in Jax
now, though many/most of the indivdual programs are still just upconverted.
And, AFAIK, Fox has never used any 480p cameras, at least for any of
their sports. The wide screen material was always upconverted 480i.
- Tom
Craig Birkmaier wrote:
> At 9:39 AM -0600 12/11/04, Doug McDonald wrote:
>
>>My point ... which is clear if you watch Fox enough
>>on a true 720p display ... is that true 720p produced
>>material clearly IS better than even the best 480 material
>>converted to 720p by Fox using really really good
>>conversion equipment. The original quoted material
>>is wrong abot 480 being "just fine" on a 720 display.
>>In fact it is inferior, if still quite nice.
>
>
> This is as one would expect. There is a great deal of useful detail
> in the realm between 704 and 1280 samples per line. Unfortunately Fox
> does not have the ability to fully exploit 480P as they must run the
> outputs of the cameras through an upgraded SDI processing
> infrastructure that is limited to 720(704) samples per line. IF the
> 480P cameras could output 854 samples per line the difference between
> it an 720P would not be a dramatic.
>
> I would also like to point out that some of the loss of resolution
> that Doug is seeing in motion with 720p is another form of artefact
> that John did not discuss in his analysis. That is, he is seeing
> MPEG-2 compression artefacts, because the ATSC channel and/or other
> downstream MPEG-2 concatenation errors are removing detail from the
> images. Of course, with 1080i this just get's worse.
>
> Regards
> Craig
>
>
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