You can see on this page, that people are pretty happy with a CX2388x
family
chip. It is the successor to the BT848/878. The nice thing about this
chip,
is you can get a card for dirt cheap. And since you aren't using the TV
tuner, it doesn't matter if a cheap card has a bad tuner or not.
http://www.videohelp.com/capturecards.php?CaptureCardRead=322&orderby=Comments
There are a ton of capture products out there. If you click on this link,
you'll end up on one of the largest web pages I've ever seen. Don't
click on this if you are on dialup. I can fix a coffee and sandwich
while this loads over ADSL.
http://pvrhw.goldfish.org/bttv/
In terms of card types, there are roughly three types for analog capture.
There are uncompressed cards (like the CX2388x based products or the
BT848/BT878 based products). There are cards that record in compressed
format, but have no hardware decompression (means processor load during
preview or playback). The third kind has compression in capture, and
decompression in viewing, and maybe even an output plug to connect
directly to a TV set.
The uncompressed card will either eat disk like there is no tomorrow.
Or eats processor, during capture, if the processor has to compress
the uncompressed stream on the fly.
A card that captures compressed, means less bus traffic, and no processor
load during plain capture. But if you want to preview or playback, the
processor does the decompression. The compression methods used, tend
to be lossy, meaning the image will be softer than the original. If
the compression format happens to be the same as the final output format,
there might be no further losses by transcoding. Otherwise, some software
would have to decompress and recompress again for the final render.
A card with both compression and decompression, removes the penalty of
previewing during capture. But otherwise, the issues of quality (softness)
versus bandwidth, remains.
This is an example of a card with both compression and decompression
$136.94:
http://www.amazon.com/Hauppauge-WinTV-PVR-350-Personal-Recorder-990/dp/B00008OOWC
This is the cheapest CX2388x family chip from Newegg (where they at least
mention which chip is used). There are some cheaper 713x based cards, but
for a first experiment, I'd try the CX2388x as it is newer:
PROLINK PV-TV304P+FMRC PCI Interface TV/FM Tuner Card - Retail CX23883
$32
http://www.newegg.com/Product/Product.asp?Item=N82E16814144307
The $32 card is cheap enough for a one-off experiment.
There are all sorts of bits and pieces of software out there. This
is just a random selection. You need to find a piece of software
that will support the card, preferably without having to rely on
the drivers that come with the hardware. So it is a complicated
purchase experience, if you go super-cheap. The PVR-350 will have
some software you can use, but it still might not be the best
software for the job. Researching the software is a lot harder
than selecting a crap capture card
Read the customer reviews for
the capture card, before you buy - Newegg has such reviews for most
products. For really cheap hardware, occasionally you will see a
"customer review" that was written by someone from the factory
in Taiwan. The really negative reviews are the honest ones.
http://en.wikipedia.org/wiki/SageTV
http://www.virtualdub.org/
http://virtualvcr.sourceforge.net/
http://www.dscaler.org/about.htm
Paul