[mythtv-users] Video Quality

[D Banerjee]

You can get very good quality, I'd contend better than broadcast but that's
an opinion other would counter I assume ;)

Use the filters for recording , read the documentation on how to enable them

kerneldeint, crop, (both low cpu), then either quickdnr or denoise3d,
depending on how good your processor is. Also use mpeg4 with all the high
quality options (HQ & 4MV) turned on.

I have livetv set to kerneldeint, crop, denoise3d, 640x480 at 5000kbits
(excessive because it's temporary, and I can) and it looks better than
broadcast. Mostly because it scrubs out reception problems and
high-frequency noise, looks only slightly worse that HDTV->xvid rips, which
are amazing quality at usually around 1000kbits, but also usually 2-pass.

The downside is all of this needs some serious CPU. The PVR cards do support
dnr filters at a minimum, with no cpu usage. I could have spent $120-200 on
a pvr card, but I spent $170 on a new cpu. It's much more versatile this
way. Also transcoding between lossy formats has real signal degredation, so
bitrate-to-bitrate pvr mpeg2->mpeg4 will always look worse than raw->mpeg4

-Debabrata

----- Original Message ----- 
From: "Adrian Byng-Clarke" <adrianbc at MIT.EDU>
To: <mythtv-users at mythtv.org>
Sent: Thursday, March 11, 2004 11:25 AM
Subject: [mythtv-users] Video Quality


Hello,

I am in the process of ironing out a few kinks with my mythtv but I was
wondering about what type of quality people are experiencing with their
recordings off of digital cable/cable TV. I'm using an Osprey 200, an entry
level video card.

How much of a video quality upgrade does one get by moving from a basic card
like that to one of the PVR cards like the Hauppauge PVR 350. For example
does the on board Mpeg 2 make that much of a difference? After all can't one
just compress the signal after capture (sacrificing time and HD space for
$$$) or is there more to it than that.

Perhaps people could post samples of video captured. I don't want to get
anyone in trouble - maybe they could just post something off of public TV
etc... I just want to get a sense of the quality. For example Tivo's high
quality setting looks to my eye exactly like the broadcast signal coming in
- there are no artifacts on a TV.  Is this possible with a Linux PVR rig?
Also is it only possible with the higher end capture cards?

Personally I probably won't want to use mythtv to actually watch my
recordings. I'm perfectly content saving them to DVD-R and watching them on
my DVD player. I'm just wondering if that will look as good as the original
broadcast or will it look strange. How successful is mythtv as a digital
VCR?

Thanks,

Adrian





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