[mythtv] XvMC VLD extension (beginnings of fix)

[Michael Weber]

> > > > > I tried the mythtv-vid branch for Via SP13000 HDTV decoding and all I
> > > > > get is a blank screen with good audio when trying to play 1080i
> > > > > content.
> >
> > > Just an FYI:
> > > Same thing is happening to me.  Blank screen, smooth audio with the
> > > VID branch on 1080i content using very new SVN openchrome drivers on a
> > > CN400 (SP13000 as well as Commell 667-T).  720p stutters far too much
> > > to be watchable either, but I'm holding out, choosing which 'bugs' to
> > > file, 1 bug-per-project at a time preferably ;)
> >
> > After some work trying to understand the code, I have a patch for
> > 1080i playback on the CN400 (well at least for the SP13000).  I
> > haven't attached the patch to the trac yet because all this patch does
> > is get the video to display instead of the blue screen.  The display
> > is good, but now the decoder can't to keep.  I have spent some time
> > looking into this since xine can play 1080 pretty easily.
> >
> > I think the the problem may be with the communication with the
> > openchrome driver.  In the driver, a mutex locks each call.  So while
> > myth is placing the image with PutSurface, the decoder cannot access
> > PutSlice because of the mutex.  Now, xine accomplishes it with the
> > locks somehow, but I haven't figured out how yet.
> >
> > I already tried to move the SyncSurface from frame end to just before
> > the PutSurface.  This reduces the number of buffering pauses for 1080i
> > and eliminates them from 720p, but it creates other problems with
> > ffw/rew and skipping.
> >
> > Another note about HD playback on CN400s, with 720p, even in xine
> > (which doesn't not have the stuttering problem like myth), the video
> > is shuffled (repeated blocks of lines on the left and right).  I have
> > not started looking into this yet, but it seems like there is a
> > problem with they way the slices get to the CN400 in both xine and
> > myth.
> >
> > mike
> >
> >
> > _______________________________________________
>
> Haven't had a chance yet, but can you tell me where and how to apply
> this patch?  I'm not home yet, but will be later this evening and
> would like to roll it in to see the progress and give feedback.
>
> Thanks!
>
> -Chad
>

The latest SVN should work, and the patch should be applied in the
mythtv/libs/libmythtv directory.  I should have run the patch from the
SVN root, sorry for the confusion.

mike