[mythtv-users] 1080p choppy playback

Andrew Gallatin gallatin at cs.duke.edu
Mon Jan 14 19:18:42 UTC 2008


Yeechang Lee [ylee at pobox.com] wrote:
> Andrew Gallatin <gallatin at cs.duke.edu> says:
> > I thought the problems with Bob were only present when running a
> > display at 1080i, not 1080p.  Bob seems to work for me with my 5200 at
> > 1080p.
> 
> Unless your 5200 is capable of a 60Hz refresh rate at 1920x1080--a
> possibility I can't dismiss--Bob won't be effective, and you haven't
> seen just how jaw droppingly-smooth its output can look on a CRT or a
> 1080p-capable flat panel.
> 
> Here is my modeline:
> 
> ModeLine     "1920x1080-mine" 148.35
> 	      1920 1960 2016 2200
> 	      1080 1082 1088 1125
> 
> My 6200, with this modeline, outputs over DVI very nice
> 59.94Hz-refresh 1920x1080 video to my 47" 1080p-capable flat
> panel. Mythfrontend is happy because of a refresh rate of 16683,
> exactly half (or less) of the 33366 frame interval. This, in turn,
> permits Bob to work, because Bob doubles the frame rate on 24/30Hz
> interlaced content.
> 
> My 5300 (a PCI Express-compatible 5200) can't handle this modeline,
> because the dot clock, 148.35MHz, is too high. It *can* handle lower
> values. If I pass it the same mode rate but with a dot clock half this
> value--74.175MHz--then the card puts out 29.97Hz 1920x1080
> video. Again, no problem for the panel, but Bob doesn't work because
> it can't increase the frame rate on interlaced content.

Strange.  I'm running the modeline obtained via EDID, which
is 1920x1080 at 60Hz, and my old AGP 5200 has no problem with
it:

(--) NVIDIA(0): Connected display device(s) on GeForce FX 5200 at PCI:1:0:0:
(--) NVIDIA(0): Sony TV (CRT-0)
(--) NVIDIA(0): Sony TV (CRT-0): 350.0 MHz maximum pixel clock
(--) NVIDIA(0):
(--) NVIDIA(0): --- EDID for Sony TV (CRT-0) ---
(--) NVIDIA(0): EDID Version : 1.3
(--) NVIDIA(0): Manufacturer : SNY
(--) NVIDIA(0): Monitor Name : Sony TV
(--) NVIDIA(0): Product ID : 9985

<....>

(--) NVIDIA(0): Detailed Timings:
(--) NVIDIA(0): 1920 x 1080 @ 60 Hz
(--) NVIDIA(0): Pixel Clock : 148.50 MHz
(--) NVIDIA(0): HRes, HSyncStart : 1920, 2008
(--) NVIDIA(0): HSyncEnd, HTotal : 2052, 2200
(--) NVIDIA(0): VRes, VSyncStart : 1080, 1084
(--) NVIDIA(0): VSyncEnd, VTotal : 1089, 1125
(--) NVIDIA(0): H/V Polarity : +/+

This is driver 1.0.8776 via VGA.  

Drew


More information about the mythtv-users mailing list