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

Todd Freeman freeman at andrews.edu
Mon Oct 17 23:05:44 UTC 2005

I have had the same problem... xine plays the files fine without the "stutter" but both livetv and recordings stutter like mad.

I am using a AMD Athlon XP 2800 overclocked as a 3200
pcHDTV2000 card with stock kernel DVB drivers
Debian with kernel.org 2.6.13 kernel
GeForce4 MX 440 8X AGP w/NVidia 7676 drivers using XVMC
512mb memory

I never tried the 18 releases but it worked prior to 18 and has been broken for quite a few months now...  I could view with xine and no one else had mentioned the problem so it got back burnered.

Thanks for mentioning it so I could add my 'ME TOO!' :}

On Mon, Oct 17, 2005 at 04:47:16PM -0600, Chris Dos wrote:
> 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
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> mythtv-dev at mythtv.org
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Todd Freeman  Ext 6103                   .^.    Don't fear the penguins!
Programming Department                   /V\
Andrews University                      // \\    http://www.linux.org/
http://www.andrews.edu/~freeman/       /(   )\   http://www.debian.org/
                                        ^^ ^^
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