Date: Tue, 18 Apr 2006 09:53:19 -0600
From: Mark Lehrer <[EMAIL PROTECTED]>
There is one product that doesn't exist - a Linux compatible hardware
media decoder. XvMC is about as close as we get, and that was
obsolete years ago...
Second that. Also an ability to genlock OGD/OGA master clock to something
external would be something to see. The problem is quite well explained
at:
http://linuxtv.org/wiki/index.php/The_DVB_Decoder_Challenge#Screen.2FDecoder_Sync_Aliasing
In that particular case software pll would work just fine by altering card
pll registers on the fly. I've been trying to seek information about the
possibility of doing the same on existing hw, but got to a conclusion
that hw way is easier (IMHO). Just put some low-Q inductance and a varicap
diode in series with the crystal and some DA to steer it. Then it's
usually possible to 'bend' the frequency about one permille or so. I've
only made some crude experiments on an old Matrox by using tvtime as
source and external sync separator ic (LM1881) to get the sync out of the
incoming video. Then monitor vsync and separated fieldsync are compared in
4046... No missed fields, field jitter or redundant motion resampling :)
DVB/DVD/DV on Xine is above my skills though.
The best way might be a dedicated DDS clock generator like one of these
http://www.analog.com/en/subCat/0,2879,770%255F843%255F0%255F%255F0%255F,00.html
Please remember that I'm just another hw-guy waiting for the OGA and can't
at the moment much help.
Keep up the good work!
-Vesa
PS. Some fine publications online: http://www.ics.ele.tue.nl/~dehaan/
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