[mythtv] #7964: Predictively skip frames to smooth out timestretch

[Dan Wilga]

Being a frequent watcher of programs with timestretch, I decided to try 
backporting this series of changes to 0.24-fixes. I started with  
mythtv_smoothsync-24fixes-p0.patch, and added the remaining HEAD 
changesets that are not part of that patch. Only minor changes were 
needed, to get it to compile.

And the smoothing works very well. Thanks!

But, I'm now noticing a sort of artifact when skipping during playback, 
even at normal speed. Let's say I've reached point #1 in the recording. 
I press skip forward, bringing me to point #2. The video plays for a 
split second at point #2, then very briefly shows the last frame from 
point #1 again, then returns to playing from point #2 as expected. The 
result is pretty distracting. I'm using the VDPAU High Quality profile 
with a GT-220 card.

In all honesty, this could be unrelated to the patch. This is the first 
time I've compiled 0.24 myself, having previously used Mythdora's 
pre-built version. When I have the time, I'll try re-compiling without 
the patch. But I figured I'd mention it, in case it rings any bells.

-- 
Dan Wilga                                                        "Ook."