[mythtv] Video Problems with BT848

[Torbjörn Jansson]

mythtv-dev-bounces at mythtv.org <> wrote:
> Hello,
> Just wondering if anyone else is having problems with the
> video with the
> cvs version for the last couple of weeks.
> After a random amount of time the video capture/compression
> falls into a
> failure mode. (Very dark image, everything else normal.) This can take
> from one second to over an hour from the time of the
> recording start, if
> at all. Also the failure only seems to occur when the MPEG4 codec is
> selected, I have not seen this failure with RTJPEG.
> 
> -Neil Whelchel-

This is not a mythtv problem, it's some kind of driver or kernel problem.
I've had this for a very long time.

If you take a look at /var/log/messages you probably have lines similar to:
kernel: bttv0: SCERR @ 077c101c,bits: HSYNC OFLOW SCERR*
last message repeated 12 times
kernel: bttv0: timeout: drop=0 irq=17829229/17829229, risc=077c101c, bits:
HSYNC OFLOW
kernel: bttv0: reset, reinitialize
kernel: bttv0: PLL: 28636363 => 35468950 . Ok

I think it's when the "reset, reinitialize" part happends the picture is all
black.
I get this problem maybe a few times a week.
I've always thought it was the crappy via chipset that caused it, but i'm
not sure.

When i was using linux 2.4 kernel instead if theese messages the computer
locked up hard.
But with 2.6 kernel it creates black picture instead.

I've never found a solution to the problem.