[mythtv-users] 50Hz PAL over 60Hz VGA (again x2) - OpenGL Video Renderer? Custom resolutions for playback?
Ben Lancaster
lists at benlancaster.co.uk
Mon Jun 11 09:57:26 UTC 2007
Hi all,
I'm one of the unfortunate ones using a Samsung LCDTV over VGA @ 60Hz
to play a 25/50Hz PAL source (DVB-T), and getting quite annoying
frame jitter from the deinterlacer duplicating frames. Solutions
discussed thus far:
1) Switch to DVI/HDMI - not an option for me; my TV doesn't have HDMI
2) Get a graphics card with component out and use that -
unfortunately, it seems that the refresh rate on nVidia cards is
hardware-locked to 60Hz for component out
3) Use a modeline that has a refresh rate that's a multiple of 25 -
this looks most promising. My TV supports 1024x768 @ 75Hz (native
resolution is 1280x720/1360x768), so with Kernel deint I do get a
much better picture, however since my TV is 16:9, the UI etc are all
stretched to fit; not ideal. I came accross the different resolutions
for playback setting, but noticed that I couldn't set arbitrary
resolutions in there, only standard TV resolutions - is there any way
to add custom resolutions, namely 1024x768 at 75Hz?
The other thing that looks promising is using the new OpenGL video
renderer mentioned here - http://cvs.mythtv.org/trac/ticket/2649
Specifically:
> Quality of the progressive scan deinterlacers is pretty good. They
> cope very well with low to moderate movement but less well with
> fast motion. (Also seem to handle frame rate discrepancies better
> than bobdeint - eg PAL at 60Hz)
and:
> TODO: Framerate conversions e.g. PAL to NTSC rates
I tried adding the "UseOpenglVideo=1" switch to my mythfrontend
command, but it seems to have no effect - I'm using latest mythtv-
trunk RPMS from atrpms-bleeding; I'm guessing that it's because this
hasn't made it in to SVN yet? Does anybody have any news on whether
this is in trunk, and how to use it? I have an nVidia 6200 card, so
from what the post says my hardware should cope with it OK.
Thanks,
Ben
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