[mythtv-commits] Ticket #1822: XvMC: Initial DVD menu not shown

MythTV mythtv at cvs.mythtv.org
Fri Jun 2 15:14:32 UTC 2006

#1822: XvMC: Initial DVD menu not shown
 Reporter:  skamithi  |        Owner:  danielk
     Type:  defect    |       Status:  new    
 Priority:  minor     |    Milestone:  0.20   
Component:  mythtv    |      Version:  head   
 Severity:  medium    |   Resolution:         
Comment (by danielk):

 I'm punting this for now.

 It appears the problem is that XvMC pause consumes frames, so we try to
 get the displayed frame rather than the used frame, so we end up with the
 still frame previous to the one we really want. If we try to get a used
 frame instead, then we consume it show it will just flash on screen and
 then go away.

 If I'm right about the problem, there are four ways to go about fixing
  1. Change the avlib decoding so that it redecodes the still frame as if
 it were a video.
  2. Implement a pause frame implementation for XvMC which copies the
 frame. This might be doable by with BLEND_SUBPICTURE compositing, by
 compositing the frame with a blank OSD, with BACKEND_SUBPICURE I don't
 know how you would do it.
  3. Use another decoder to decode still frames, and use the XvImage
 supported by all XvMC implementations I know of; or simply use X11 paint
 calls and block XvMC display. This will problably require some additional
 hacking to get OSD to work.
  4. Implement some special UpdatePauseFrame for still frames which avoids
 consuming frames by some kind of VideoBuffers frame accounting trickery.

 None of these are very simple. If #2 is possible it is probably the best

 There is another possible hack, which is to just disable XvMC for DVDs. If
 no one else is interested in fixing this, I can apply that hack as the

Ticket URL: <http://svn.mythtv.org/trac/ticket/1822>
MythTV <http://www.mythtv.org/>

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