[vdr] Re: Audio & Video not syncron

[Marcus Kuba <marcus@kuba4u.de>]

Am 28.04.2002 22:38:51, schrieb "valshare" <valshare2000@gmx.net>:

Hello...

>i have made a record with my both DVB-S Cards at the same time. The Sound is
>not syncron with the video signal. How can i fix it in the future ? My
>Hardware is the follog: Celeron 700, 128 MB Ram. 60 Gig HD.

since I switched to the Mediaportal-Hardware, I've got the same problem,
and I believe you also use a Mediaportal as base-system?
I have 2 DVB-S Rev. 1.3, two HDs (80 + 120 GB), 128MB and the original
Celeron 433. The OS is the same I used before with a Duron 1000, I simply
put the Harddisk with all the (until then) working software in the Mediaportal
and since then not a single recording is OK. I'm running Suse 7.3 with the
2.4.16 kernel-update.
Recordings sometimes are OK for the first 15-25 minutes and then they start
to 'jump' and the sound goes async (several seconds after the picture).
Old recordings don't show the effect, so it's no problem of playback.
The jumping always starts at the same place, so I'm quite sure the problem
is IN the recording.
A strange side-effect is that when I pause and go into slow-motion, I can't
see any more jumping effects.
The jumping also appears when watching premiere in transfer-mode...
after 20 minutes or so the jumping/async sound begins and I get lots of
'kernel: buffer empty'-messages. Switching to another channel and back
cures the problem for another 20 minutes.
The messages don't appear while recording.
Since the problem also exists in transfer-mode and not only while recording
to disk, I'm sure it can not be a problem with the harddisk-performance.
Memory also can not be a problem, the problem exists even if there is no
swapspace in use and 40megs cached. It is also unlikely a cpu-problem,
since the system is 80 or more percent idle and VDR uses no more than
15%. According to the sensors-package the voltages in the system are
also in the desired ranges and the temperatures are OK, too.
Also with the change to that hardware, I very often get the 'OSD-color'-
problem. In the bios I turned off ACPI and all power-management-stuff
I found.. no change yet.
A friend of mine has the suspicion that it might be a problem with interrupts.
The cards don't share any interrupts, but the dvb-s generate much more
interrupts than for example the timer.. several 1000 per second from the 
replaying card while in transfer-mode. Is it possible that the Mediaportal-
hardware has problems with that? I know that a single-card-system does
work without recording-problems...
Anybody any idea? What does the "buffer empty" mean, where does it
come from? Currently it looks like that MP-stuff wasn't really the perfect
solution... but I'll keep trying.. next will be a kernel without any APM-stuff
in it and if that doesn't help I'm going to try another power-supply.

Greetings,   Marcus