[mythtv] DVD playback issues, patch

Johnny Stenback mythtv-dev at jstenback.com
Sat Nov 14 17:36:16 UTC 2009

Hello David,

Thanks for digging in here. I haven't been able to test your patch on my 
primary system where I use VDPAU for playback yet, but I did test using 
software decoding and software rendering and it does not seem like your 
patch fixes the problem I'm seeing, and in a way it seems to make it 
worse :(

Without your patch, if I fast forward for just a second after starting 
DVD playback, the audio/video speeds sync up and remains in sync from 
then on, but with your patch I can't seem to get audio and video to ever 
be in sync, it's always off by what looks like ~2x.

I wish I could help more here, but I don't know this code at all and I'm 
unable to spend any serious time on this in the foreseeable future.

Davin McCall wrote:
> Here's an updated patch. The main change is that it avoids advancing the
> vsync trigger if a frame is dropped. Otherwise, WaitForFrame will
> effectively wait for the frame anyway, so dropping it has no effect.
> This caused problems on some media files I have.
> Davin.
> On 13/11/09 23:35, Davin McCall wrote:
>> Hi all,
>> Regarding the DVD playback issues I mentioned earlier. This is
>> (possibly) related to the following tickets:
>> http://svn.mythtv.org/trac/ticket/7067
>> http://svn.mythtv.org/trac/ticket/7349
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