[mythtv-users] 1080p minimum TV size

Michael T. Dean mtdean at thirdcontact.com
Mon Oct 8 18:14:45 UTC 2007


On 10/08/2007 01:44 PM, Brian Wood wrote:
> A lot depends on what material you plan to view on the set. You will not
> see 1080p over the air or from cable any time in the near future, you
> can get that only from Blu-Ray or HDDVD right now.
>   

Is that really true?  ATSC provides for 18 formats (
http://www.hdtvprimer.com/ISSUES/what_is_ATSC.html ), including two
1080p formats.  (BTW, 1080i and 1080p and 720p should be called
something more like 1080i60 or 1080p30 or 1080p24 or 720p60 or 720p24.) 
I haven't looked through my recordings from channels using 1920x1080
resolution to see if they're all 1080i60 (as most seem to presume) or if
some may be 1080p30 or 1080p24.  IMHO, it makes sense for a broadcaster
to use 1080p24 for movies and other 24fps content rather than telecining
to 1080i60 (less processing required for the content).  And, for 30fps
progressive material--if any does exist--broadcasting at 1080i60 would
actually introduce temporal errors in the video unless there were some
way for the video to say to the decoder to just slap 2 fields together
to create a frame and display that frame at half the field rate.

If nothing else, I'd say that 1080p broadcasts do exist in the form of
24 frames/second material that's telecined to 30 frames/second (i.e. for
transmission in 1080i60).  With a proper ivtc, you end up with 1080p24...

> A lot of people don't see the difference between 1080i and 1080p, but of
> course the makers and the salespeople see the difference, in their
> profits and commission checks.

Definitely true, and probably the best way to look at it.

Mike


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