[mythtv-users] PVR-250 slightly fuzzy picture?

Jarod C. Wilson jcw at wilsonet.com
Wed Jan 28 13:24:09 EST 2004

Hash: SHA1

On Wednesday 28 January 2004 06:17, papenfuss at juneau.me.vt.edu wrote:
> 	Hey all... I got my PVR-250 (rev1) last week, and succeeded in making
> it go in a PIII-800 box.  I have been playing with different
> resolution/bitrate combinations, but have concluded that the quality is
> just plain "not quite there."  The recorded quality (live tv or recorded)
> is a bit fuzzier than watching live tv on the same tv.  The tv is a
> midgrade Hitachi projection, but I'm sure that the tvout quality is not the
> problem (excellent quality with MythVideo or MythDVD).  The
> resolution/bitrate is not the problem (tried capturing at lots of
> sizes/bitrates up through 720x480 @ 8000-10000 Mbps). The tuner portion of
> the card is not the problem (tried capturing
> composite/svid directly from a dvd player).
> 	I'm just wondering if it's a software thing, or if the card itself is
> simply not capable of recording fairly high quality recordings.  I have
> downsized the capture resolution (keeping a very high bitrate), and the
> quality seems to level off at about 480x480.  I know that cable signal has
> about 320 lines (roughly what I'm seeing at 480x480), BUT the whole point
> is the tv looks better with the same signal.  If I oversample the hell out
> of it, I should get quality approaching the TV.
> 	Any thoughts?

I get picture quality with both my PVR-250 (rev2) and AVerMedia M179 in my 
main MythTV box that is at least on par with what gets fed off my Motorola 
DCT-5100 cable box, both hooked to a High-Def TV via component video. Now, I 
haven't used a rev1 PVR-250, so I can't say absolutely for certain, but the 
card *should* be capable of producing recordings that are on par with what 
you're seeing with the signal fed straight to the TV. You might need to tweak 
some of the dnr settings with ivtv's test_ioctl utility...

- -- 
Jarod C. Wilson, RHCE

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