[mythtv-users] Myth scaling/deinterlacing vs Faroudja

[Brad Templeton]

On Tue, Jun 27, 2006 at 11:42:00AM -0400, Michael T. Dean wrote:
> On 06/24/2006 08:58 PM, Brad Templeton wrote:
> > It's a shame the HD committee didn't sit
> > down and say, "You know, by the time people can actually afford 1080
> > line displays, 1080p should not be a problem."   Done at 30fps if that's
> > what the broadcast channel had bandwith for.
> >   
> 
> If by, "HD committee", you mean the ATSC, they did.  See 
> http://www.hdtvprimer.com/ISSUES/what_is_ATSC.html for the 18 ATSC 
> formats, including 1080i60, 1080p30, 1080p24, 720p60, 720p30, 720p24 
> (and then all the 480 line resolutions).
> 
> > Particularly jarring is that many of the HD things, like movies, are shot
> > at 24fps, non-interlaced.
> 
> Which can be handled by ATSC (1080p24 or 720p24).
> 
> > I don't know whether the 1080i shows that
> > are shot on video today are shot at 1080i or some other rate.
> >   
> 
> AIUI, many (most?) dramas are shot at 24fps and, for broadcast at 
> 1080i60, converted using a 3:2 pulldown (or, more often, 2:3 pulldown, 
> which is typically referred to as 3:2 pulldown ;).
> 
> However, ATSC doesn't require the broadcast at 1080i60.  Whether those 
> channels that have chosen 1080i actually broadcast material at 1080p30 
> or 1080p24 I can't (yet) tell you...  However, I've never seen any 
> standard that prevents them from doing so.  (I think it's more likely 
> expense of equipment for handling multiple source formats that would 
> prevent them from doing so if they don't.)

The ones here are broadcasting interlaced, and I expect that's common in
other cities.  More to the point they have, as far as I can tell, all
decided not to ever switch formats.   SDTV shows are upscaled to 1080i,
24fps movies, sports etc. are shown at 1080i.   They also do SD sub-channels
at 480i, I have not seen anybody do 480p.    It's possible the 720p stations
may switch from 30fps to 60fps, as I have seen some 720p recordings myth
stutters on, and some it displays more easily than 1080i, but I haven't
examined them for  frame rate.