[mythtv] HD-3000 and changes from 18.1 to SVN

[Chris Dos]

After talking with some people on the IRC, they suggested that I post my message 
to the developer list since something has changed in the way the DVB code 
handles buffers.

Here is the post that I sent to the Users list:

I have a HD-3000 card that I got working using the 18.1 Debian packages.
However, upgrading to SVN resulted in the frontend spewing "A/V diverged by
<dropped frames number here (usually around 3-5 frames)> frames, extending frame 
to keep audio in sync" in
it's logs.

I guess I need to layout my system and what I've found out so far.

Relevant System Componets:
Debian Sid
AMD Sempron 64 1600+, overclocked to 2.0 ghz from 1.6 (lot of head room in that
chip, I read someone getting 2.6 ghz out of it)
512 MB PC2100 memory.
7200 RPM IDE 120 GB Drive.
HD-3000
PVR-350
nVidia FX5200 DVI Card (Using XvMC, This outputs to my DLP HDTV)
ivtv-.4.0
Kernel 2.6.13 using the DVB drivers for the HD-3000

It took me a good three weeks to the HD-3000 card to work properly.  I kept
getting the "A/V diverged by 4.28889 frames, extending frame to keep audio in
sync" errors whenever I had the sound enabled on MythTV.  Disable the sound and
720p and 1080i would play flawlessly.  Enabled sound, and the dropping frames
would occur again.

I tried a SB Live card and the on board VIA audio and still experienced the same
problems.  Everything pointed to the sound card being the problem.  I had
tweaked just about every setting possible to solve the problem.

Nothing worked, until I changed the DVB recording buffer options.  MythTV 
defaults with 8192 for "Per PID driver buffer size" and "Packet buffer".  I 
changed this to 16464 and HDVD played flawlessly (well, as good as XvMC and OSD 
can play nice together).  So the problem doesn't appear to be sound related, 
just how much buffer was available to fit the signal.

So now I upgraded to SVN on Friday, and the "A/V diverged" frames problem showed
back up.  Changing the "Per PID driver buffer size" and "Packet buffer" to as
high as 100000 and as low as 8192 made no difference.

Does SVN no longer use the buffer settings?

Any insight into finding out what this problem is would be greatly appreciated.

	Chris