[mythtv-users] How to improve capture quality
Jay Mallar
jaymallar at gmail.com
Mon Oct 22 17:11:05 UTC 2007
Steve Peters - Priority Electronics wrote:
> What is your recording bitrate set at?
>
> -----Original Message-----
> *From:* mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org] *On Behalf Of *Jay Mallar
> *Sent:* Monday, October 22, 2007 9:46 AM
> *To:* Discussion about mythtv
> *Subject:* [mythtv-users] How to improve capture quality
>
> My machine:
>
> Intel Quad Core (Q6600)
> Asus P5N32-Plus MB
> EVGA GeForce 6200-LE
> Hauppauge PVR-250
>
> My video card is connected to my monitor via the VGA port and to
> my TV. The TV connection is S-video out to an RF Modulator to my
> TV's cable input.
>
> The quality of video captured via the PVR-250 isn't what I'd hoped
> for. I thought at first that the video card or the connection to
> my TV had been the problem, but that isn't the case. I've watched
> DVDs and AVIs on the machine via the same video connection to my
> TV and the images are sharp and clean.
>
> However when I capture video and replay it, it is grainy at best.
> When the image changes rapidly, I get what I can only hope to
> describe as problems with refresh timing; I see this big
> horizontal lines where it looks like the image was painted to a
> certain point and then repainted again before it finished. It's
> worse with high-contrast, fast action.
>
> I suspect I need to tweak the capture settings, but I'm curious
> what the best values are. I tried using the settings from the
> Wiki (http://www.mythtv.org/wiki/index.php/Recording_Parameters),
> but those don't seem to be getting me where I'd hoped to be.
>
> At the very least, shouldn't I be able to get the quality I see
> when I hook my TV directly to the satellite STB or to the output
> from my TiVo (Are these TiVo values accurate?
> http://alfter.us/tivo2svcd.shtml?)
>
> Setting the resolution to anything higher than width of 480 seems
> to have no effect. Myth won't let me change height above 480.
> I got a bit lost the settings for bitrate etc.. Not sure if
> bitrate is avg or min or both, and not sure if Myth uses VBR or
> CBR. From what I've read avg bitrate should be set below max
> bitrate, but I'm not getting good results trying to tweak on my own.
>
>
>
>
>
>
>
> ------------------------------------------------------------------------
>
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>
Right now It's set to 480x480, MPEG-2 PS, 4:3, BR 5800, MBR 8000, but
I've also used the defaults of 480x480, MPEG-2 PS, 4:3, BR 4500, MBR
6000 as well and honestly can't tell the difference between them.
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