[mythtv-users] Got smooth playback? please post your setup & configuratio

Sun Aug 6 17:00:10 UTC 2006

> -----Oorspronkelijk bericht-----
> Van: mythtv-users-bounces at mythtv.org [mailto:mythtv-users-
> bounces at mythtv.org] Namens Joe Votour
> Verzonden: zondag 6 augustus 2006 18:42
> Aan: Discussion about mythtv
> Onderwerp: Re: [mythtv-users] Got smooth playback? please post your setup
> & configuratio
> 
> > OK, I think the trouble is my graphics card (the nvidia 6150), which is
> > built onto my motherboard. The only thing stopping me from switching to
> a
> > card like the nvidia 7300GS, is that the only reason I bought my
> > motherboard
> > (an MSI mini-atx thing with PCI-E, and DVI out) was because it has
> onboard
> > DVI. And I can't find a 5300FX anywhere (I need a PCI Express GFX card).
> >
> > I don't surpose you know what the TV setting does in mythtv-setup, I can
> > select multiple different types of PAL, but it doesn't seem to make any
> > difference.
> >
> > You said your refresh rate is 60Hz, is that "exactly" 60 or close, like
> > 60.02
> >
> > thanks so far, James
> >
> > On 06/08/06, Joe Votour <joevph at yahoo.com> wrote:
> >>
> >> > (sorry if this was posted twice, didn't know if it sent properly...)
> >> >
> >> > Hi, I am having great trouble getting smooth playback (live tv or
> >> > recorded).
> >> > I've tried everything (that I can think of), and still can't get TV
> to
> >> > look
> >> > anything like as good as Sky. The ticker tape on BBC news (I'm in the
> >> UK)
> >> > is
> >> > really jerky compared to any set-top-box output of the same channel.
> >> >
> >> > Could anyone who's got smooth playback (and I mean as smooth as a
> >> > set-top-box gives out), please post there setup and configuration.
> >> >
> >> > I'm looking for:
> >> > - what kind of tv link are you using (dvi, component etc...)
> >> > - what refresh rate you are using (ie, 50Hz, 60Hz)
> >> > - what settings do you use for playback (Deinterlacer, opengl sync
> >> etc..)
> >> >
> >> > I would like to know so that I'm sure I'm not missing something
> vital.
> >> > Also,
> >> > I'm mostly interested in HDTV capable setups, i.e. people who are
> >> using
> >> > resolutions which are capable of HDTV.
> >> >
> >> > I have a pretty powerful Rig (AMD 3500+, 1gig of RAM, 200gb hdd), and
> >> am
> >> > using a DVI->DVI connection to my TV (which gives out a correct
> >> modeline
> >> > (1360x768), but only for a 75Hz refresh). My graphics card is an
> >> > intergrated
> >> > nvidia 6150. Everything seems to work (except XvMC, don't know why,
> >> but
> >> > shoudn't be required with this rig), but when I watch any TV it's
> real
> >> > jerky.
> >> >
> >> > Not meaning to make this like a survey, just I've been trying since
> >> Easter
> >> > to get this thing to work (was an Easter project), and I'm beginning
> >> to
> >> > give
> >> > up.
> >> >
> >> > Thanks in advance, James Buckley
> >> > _______________________________________________
> >> > mythtv-users mailing list
> >> > mythtv-users at mythtv.org
> >> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >> >
> >>
> >>
> >> I don't mean to discourage you, but having actually worked on a set-top
> >> box, I'll say this up front - with MythTV (or any other Windows/Linux
> >> program), it will be very difficult to get set-top box quality.  Set-
> top
> >> boxes have video output chips that are optimized for MPEG-2 playback,
> >> and
> >> they also take into account all the little things that are necessary,
> >> such
> >> as perfect vertical sync timing (for page flipping without tearing).  A
> >> general purpose Linux system just can't get *that* good, but it can get
> >> pretty close.  A lot of good discussion can be found here:
> >>
> >> http://www.gossamer-
> threads.com/lists/engine?do=post_view_flat;post=116194;page=1;sb=post_late
> st_reply;so=ASC;mh=25;list=mythtv
> >>
> >> That said, I get pretty good quality output on my system, especially
> >> using
> >> HD.  I only get the odd noticable jitter when I'm watching a ticker on
> >> CNN
> >> or ESPN (ESPN has fast tickers, so any artifacting in the display is
> >> really noticable).
> >>
> >> Here's what I've got:
> >> - GeForce 5200FX connected to an HDTV monitor running at 720p
> (1280x720)
> >> via VGA (60Hz)
> >> - Using XvMC because my CPU (an Athlon64 3200+) can barely keep up
> >> - OpenGL Vsync enabled
> >> - Bob deinterlacing enabled
> >>
> >> -- Joe
> >>
> >>
> >> ___________________________________________________________
> >> $0 Web Hosting with up to 200MB web space, 1000 MB Transfer
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> >>
> >> _______________________________________________
> >> mythtv-users mailing list
> >> mythtv-users at mythtv.org
> >> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >>
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> 
> I certainly hope that the 6150 isn't the problem (and I somehow doubt that
> it is), because I plan to move to an Asus motherboard that hasa built-in
> 6150 on it.  There's an attraction to having the graphics built-in, and
> having VGA, DVI, S-Video, Composite and Component all available to me
> (although, not necessarily at the same time).
> 
> Since I live in the United States, I pick "NTSC" for my TV-standard.
> (Technically, it would be "NTSC-M", but I suppose it's left as NTSC, since
> they have a "NTSC-JP" for Japan, which should be "NTSC-J".)  Nonetheless,
> you need to pick the standard appropriate for the area that you're living
> in - there are slight changes in the different PAL modes, and they are
> geography specific.  I believe (but am not totally sure) that this setting
> is used for programming an analog capture card (in the case that the tuner
> supports multiple variants of PAL, for instance).
> 
> My TV (and the manual that come with it) indicate that I am running at
> exactly 60.0Hz in 720p (but it only shows one decimal place of accuracy).
> However, one thing to keep in mind is that this is a CRT HDTV, and I
> believe that it's more of a VGA monitor than it is a real TV (although it
> does have standard TV connections like an RF in for an antenna/cable
> connection and component/S-Video inputs)
> 
> -- Joe
> 
> 
> ___________________________________________________________
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Hi James

Before you buy any new hardware. You have to know that if you living in the
UK your are in pal area, so that means 50Hz video content. So if you want
that to look smooth your refresh rate has to be 50Hz or a multiple. (basicly
50 or 100hz)
If you play 50Hz video content on a 60Hz refresh rate screen it will never
look smooth.
Altough it is very easy to make a modeline with 1360 x 768 at 50hz with for
example the following modeline calculator.
http://xtiming.sourceforge.net/cgi-bin/xtiming.pl
Modeline "1360x768 at 50" 67.86 1360 1392 1648 1680 768 784 791 807

Most LCD tv sets don't accept 50Hz at there native resolution.

So you probably have to use a HDTV compatible modeline @50Hz.
For example 1280x720p50
Modeline "1280x720 at 50" 59.42 1280 1312 1536 1568 720 735 741 757

What brand and type of LCD TV are you using?

Wim