I've been off the list for a while, so I'm sending an update. Gerd,
Gunther please read. There's info for both of you here.
Robert W. Fuller wrote:
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.)
Gunther, my neighbor finally got a camera phone, so I might be able to
get you a picture of this board as you requested.
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.
Gerd, because of this particular problem, I have been capturing in
704x480 and scaling down to 352x240 to make standard video CD's. Well,
I finally found a solution to this problem. Gerd, the answer is to use
your new 0.9.11 driver. Those intermittent horizontal lines at 720x480
are GONE with 0.9.11. This gives me a nice capture for scaling down to
Super VCD at 480x480.
Of course, I now have a new problem. Although I can capture from
Composite1 fine with streamer and 0.9.11, xawtv-3.88 does not seem to
work. I get no video and a bunch of messages like this:
ioctl:
VIDIOC_S_FMT(type=VIDEO_OVERLAY;fmt.win.w.left=93;fmt.win.w.top=121;fmt.win.w.width=384;fmt.win.w.height=288;fmt.win.field=INTERLACED;fmt.win.chromakey=0;fmt.win.clips=0x80b0ea4;fmt.win.clipcount=0;fmt.win.bitmap=(nil)):
Invalid argument
If I try to capture from Television source, then I get a bunch of weird
green gobbledygook.
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?
I tried the ATI TV Wonder VE and it had the same horizontal line issue
with 720x480 so I suspect a combination of my motherboard/BT8x8. As I
said though, 0.9.11 seems to address that particular problem.
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.)
This remains true. I have no problem capturing at 704x480x29.97 fps. I
do have to set gbuffers to 32.
Thanks for any advice on the xawtv-3.88/bttv-0.9.11 issue.
Regards,
Rob
