On Tue, 22 Jun 2004, Steven Ellis wrote:
> Well thanks for the interesting tip. Already considered this angle and
> there are a couple of issues.
Welcome!
> 1. Can't really build a PVR around this, which is part of the long term
> goal.
You most certainly can. Might be an extra (S-Video or composite)
cable or two involved but that shouldn't be an insurmountable problem.
> 2. Its too expensive here in NZ (NZ$ 600)
Can't help with that (the ADVC100 is just $250 or less here) but there
are the other models such as the 55 that might be suitable. Also,
there are other brands such as Datavideo that are slightly less
expensive.
BUT - out of quality, speed and cheap you can specify two but NOT all
three.
> Wonder if anyone has played with realtime capture to DV from an analog
> card?
Quite cpu intense.
You might try splicing/striping two discs together into a RAID-0
setup (each disc on its own IDE channel) - perhaps that'd be
sufficient.
For casual viewing (i.e. view and delete or discard) the analog
cards are "adequate". For archival purposes, well, quality isn't
free/cheap ;( The other gotcha is that the analog cards (at least
the Bt878 based ones) going thru the v4l layer yield square pixels
which means you need to scale the data (to 10:11 pixels for NTSC,
to 59:54 pixels for PAL) before encoding or the aspect and/or frame
size will be wrong. Maybe that's better/different since the last
time I checked.
The main drawback of the PVR cards that go directly to MPEG-2 is that
they don't give you a chance to run the data thru any filters to
clean the picture up - and VHS sources are always (that I've seen)
in dire need of filtering. After seeing what 'y4mdenoise' can do
to a noisy VHS source I decided it was worth the extra hours of
encoding time. Dual cpu systems are pretty much a requirement though
when using a pipeline of filters but I haven't had a single cpu system
since 1998 or so (except for the notebooks ;)).
Cheers,
Steven Schultz
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