[mythtv-users] MacOSX frontend & 1080i

Todd Ignasiak ignasiak at gmail.com
Tue Mar 13 15:21:24 UTC 2007

On 3/13/07, Andrew Gallatin <gallatin at cs.duke.edu> wrote:
> What *does* make a difference is displaying on an external monitor,
> rather than using the builtin 1680x1050 flat panel.  When using a Dell
> 2001FW (1600x1200, 60Hz), 1080i video is much, much, much more smooth.
> I expect that this has something to do with the refresh rate of the
> Dell LCD being 60Hz, while the refresh rate for the builting LCD is
> 150Hz (according to myth, refresh is N/A according to the Display Pref
> pane).  I guess I'll have to haul the computer downstairs and try
> actually hooking it to the TV before I know if it will work.

I tried Myth on my MacBook Pro, with a 1440x900 display, and it worked
on that display.  I got a few of the "out of sync" messages, about
very 7-10 seconds or so, but the video display looked good.      I
have an old CRT monitor that can do fairly high resolutions..  I'll
have to dig it out of the basement and test some more resolutions to
see if I can replicate what you're seeing.

Also, I doubt the LCD is being run at 150Hz, where does Myth show
that?   I think LCDs are set to 60Hz by default, although it's hard to
tell for sure.   I installed SwitchResX control panel & output the DDC
data for the display, and it showed it was running 1440x900 @ 60Hz.

> I have only 2 problems left that I know about right now:
> - Myth seems to want to enable/disable deinterlacing at random leading
>   to motion artifacts:
> 2007-03-13 08:47:40.763 NVP: interlaced frame seen after 85 progressive frames
> 2007-03-13 08:47:40.846 Enabled deinterlacing
> 2007-03-13 08:47:41.780 NVP: progressive frame seen after 29 interlaced  frames
> 2007-03-13 08:47:41.847 Disabled deinterlacing
> 2007-03-13 08:47:41.948 NVP: interlaced frame seen after 5 progressive frames
> 2007-03-13 08:47:42.014 Enabled deinterlacing
> 2007-03-13 08:47:42.431 NVP: progressive frame seen after 14 interlaced  frames
> 2007-03-13 08:47:42.498 Disabled deinterlacing

I sometimes get messages with a many frames (e.g. progressive frame
seen after 11 interlaced frames), but I don't get any "Disabling
deinterlacing" messages.  Are you switching to different channels and
maybe showing a 720p station (ABC, Fox)?     You can override the
interlacing detection in the menu during playback.

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