I have the AverMedia TV/FM98 dbxStereo.
And though I get stereo sound out, I haven't tried to capture at @
720x480@xxxxx for quite some time (since I had Celeron 550's, now I
have an Athlon 1800+, but I'm moving the cards to a P4 800 system)
I'd be playing with the sound options for the bttv driver. Possibly
wrong PLL detected or sumsuch.
Under Linux for whatever reason, I get noise from the audio loopback.
This isn't true for Win2K (Note that I'm not a Windows user
anymore--thanks to OpenOffice, Mozilla, VLC, GAIM, and others--but I use
Windows as a control for hardware that the vendor supports on Windows
before I try to get that hardware working under Linux.)
The other problem I'm having with the board occurs when I do a full
frame NTSC capture, 720x480@xxxxx fps. I get a narrow intermittent
horizontal line approximately 1/3 from the bottom of the frames. I
don't see this when I'm viewing the full 720x480 frame on the Windows
side of things. Also, I found that I could remove this line by running
yuvdenoise with the de-interlace option. However, the video is already
"de-interlaced." Consequently, running the de-interlacing filter has
the nasty side effect of making the capture blurrier.
Will I have better luck with a different BT878 board? Perhaps I should
use something completely different? Are people familiar with these
problems? Are there known solutions?
On a side note, I'm very pleased with Linux 2.4.x performance for doing
raw video capture. Capturing full frame NTSC video raw, according to
vmstat, I'm getting a sustained 20 MB/sec to my 5400 RPM hard drive. A
gigabyte per minute is just fine with the Linux disk subsystem (contrast
that with Win2K which chokes around a few megabytes per second.)
--
Michael O'Keefe | mokeefe@xxxxxxxxxxxxx
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My views are MINE ALONE, blah, blah, |Home:+1 858 748 5432 \`O'|
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