[mythtv] DVD playback issues, patch

Davin McCall davmac at davmac.org
Sat Nov 14 23:15:05 UTC 2009


What do you mean by "off by 2x" ... 2x what? Do you mean video is 
playing twice as fast as audio (or the other way around)?
Or, does video lag audio by a consistent amount (2 frames, 2 seconds?) 
or the other way around?



On 15/11/09 04:36, Johnny Stenback wrote:
> 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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