[mythtv-users] HDTV With Motion Not Smooth

Steve Adeff adeffs at gmail.com
Thu Dec 29 23:07:53 EST 2005

On Thursday 29 December 2005 23:02, Buechler, Mark R wrote:
> The more I look at HDTV the more I have to agree with you. HDTV seemed very
> smooth under 7607 but under 8417 it seems to be on and off jerky at VERY
> regular intervals about every 3-5 seconds. Audio is flawless, however. I'm
> also seeing this in some SD channels. Not sure what's changed recently..
> - Mark.
> -----Original Message-----
> From: Steve Adeff [mailto:adeffs at gmail.com]
> Sent: Thursday, December 29, 2005 9:33 PM
> To: mythtv-users at mythtv.org
> Subject: Re: [mythtv-users] HDTV With Motion Not Smooth
> On Thursday 29 December 2005 15:21, Michael T. Dean wrote:
> > Michael Haan wrote:
> > > So, Iknow it's somewhat subjective, but watching Lost, the motion
> > > seems to be fine.  I'm wondering if 720p vs 1080i might me the issue.
> > > Does anyone know what Lost is broadcast in, vs My Name is Earl?
> >
> > Lost is on ABC and ABC is 720p.  My Name is Earl is on NBC and NBC is
> > 1080i.
> >
> > TTBOMK, it can be broken down as:
> >
> > ABC/Fox = 720p
> > CBS/NBC/PBS/UPN*/WB = 1080i
> >
> > *at least those UPN stations owned by CBS (don't know about the other
> > UPN stations, but some may be in 720p)
> >
> > Also, all cable/satellite premium networks (HBO, Showtime, Discovery HD,
> > HDNet, HDNet Movies, INHD) use 1080i for movies/special programs
> > (because it's better for "not fast"-moving scenes).  ESPN HD (which,
> > like ABC, is owned by Disney) uses 720p (because it's better for
> > fast-moving scenes as exist in sports).  Strangely enough, NBA TV uses
> > 1080i (maybe they have the players run slowly :).
> >
> > Mike
> I don't know if 720p is better for fast moving scenes as much as
> progressive
> images allow for more visual depth and are easier on the eyes (lack of
> interlace effect). Since 1080i is twice the field rate of 720p, motion on a
> good monitor should be more or less the same for both. Do you have a way of
> feeding your TV HD signal without going through Myth(internal tuner,
> cablebox, etc)? See if you notice the same issue.
> When I was using my TV's internal ATSC tuner for HD I noticed no motion
> issues
> (my TV is 1080i native, so no way to test 720p vs 1080i). I do however
> notice
> motion issues running through Myth SVN occasionaly, dunno if its cause I'm
> taking 1080i signal, outputting at 720p and then the tv scaling to 1080i
> (quite backwards I know, need to get a better TV.... or get the right
> combinatino of hardware/software to get proper interlace output on DVI). I
> also can't seem to use XvMC working, so I haven't compared that. My next
> issue to tackle...

Revert to 7607 and check =)


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