[mythtv-users] PVR 350 TV out
Chris Martin
council.tax at gmail.com
Tue Jan 18 07:28:41 EST 2005
On Tue, 18 Jan 2005 10:55:44 -0000, Nick <pvr at insidethex.co.uk> wrote:
> > I've been following Jarod's guide for FC3, and have got most things
> > working. Unfortunately I'm having great difficulty getting my PVR
> > 350's TV out to work.
> >
> > If I run the commands
> >
> > # /sbin/rmmod saa7127
> > # /sbin/modprobe saa7127 test_image=1
> >
> > I see the test pattern correctly, however if I try to pipe video
> > through the tv out, with the commands:
> >
> > # /usr/bin/ivtvfbctl /dev/fb1 -noglobalalpha -localalpha
> > # dd if=/dev/video0 of=/dev/video16 bs=64k
> > I just get what looks like a blank screen with a load of interference
> overlayed.
>
> First unload the test image. Which input have you selected for output - you
> may be seeing the tuner which is likely not yet tuned to a signal. Can you
> see any movement on the TV or just snow?
>
> Check to make sure your devices exist:
>
> # ls -l /dev/video*
>
> Also, check your system logs for the ivtv init output, this can provide
> useful info on what's happening.
>
> Now repeat these two commands, changing x in the first command for values
> between 0 and 9:
>
> # /usr/bin/ivtvctl -p x
> # dd if=/dev/video0 of=/dev/video16 bs=64k
>
> This will go through the card's inputs in turn - hopefully you'll see
> something on the TV on one of them - have you got a composite or S-Video
> source hooked up to the card?
>
> If /dev/fb1 is your ivtv framebuffer you can also try:
>
> # /usr/bin/ivtvfbctl /dev/fb1 -globalalpha -nolocalalpha
>
> or
>
> # /usr/bin/ivtvfbctl /dev/fb1 -alpha -on -globalalpha -nolocalalpha (I have
> to use this one)
>
> to try to get rid of the lines on the screen when ivtv loads.
>
> > I've also tried to run X through the tv out, using the appropriate
> > xorg.conf file. In this case I get a static screen made up of lots of
> > tiny dots that looks pink/purple/blue from a distance.
>
> Try and get normal TV-out working first, then X once this is working
> normally.
>
> Check here for ivtv help:
> http://www.gossamer-threads.com/lists/ivtv/devel/ - lots of valuable info.
>
> Nick
>
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>
Thanks for your reply,
Here's a better explanation of what happens:
# /sbin/rmmod saa7127 [completely blank screen on tv]
# /sbin/modprobe saa7127 test_image=1 [test image of coloured lines on tv]
# /sbin/rmmod saa7127 [back to blank screen]
# /sbin/modprobe saa7127 [black and white fuzzy background, overlaid
with 5-6 horizontal and diagonal flickering lines]
#/usr/bin/ivtvfbctl /dev/fb1 -noglobalalpha -localalpha [background
goes darker, still have flickering lines]
#dd if=/dev/video0 of=/dev/video16 bs=64k [sound comes out of the tv's
speakers. No change to the screen]
ctrl-c
# /usr/bin/ivtvfbctl /dev/fb1 -alpha -on -globalalpha
-nolocalalpha[background goes black, still have the flickering lines
but not so bad].
#dd if=/dev/video0 of=/dev/video16 bs=64k [sound comes out of the tv's
speakers. the background changes to something that could be a very
distorted black and white tv signal, but could not be, still have
those flickering lines]
ctrl-c
Just to check that my tv signal is ok
#cat /dev/video0 > /tmp/test_capture.mpg
#mplayer -vo xv /tmp/test_capture.mpg
results in a perfect picture through the monitor.
I couldn't find anything in the logs and # ls -l /dev/video* shows
that my devices exist. I'm in the UK, so I'm using an S Video ->
Scart cable going into a PAL TV. Am I right in thinking that as the
test patter displays ok, I can rule out a problem with my cable?
Thanks,
Chris
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