[mythtv] AVSync2 Improvements

[Peter Bennett]

On 2/17/19 2:03 PM, David Engel wrote:
> 2. I have my fast forward speeds set to 10x, 20x, 60x and 180x.  10x
> and 20x work normally.  60x and 180x have problems.  A video frame is
> displayed and then there is a very long pause before another video
> frame is displayed.  Basically those speeds are useless.  Like above,
> the problem goes away completely after I turn off avsync2.  I can
> provide logs for this if you want.
I have committed a fix for FF/REW. At 120X it now works the same in 
avsync and avsync2. On the shield with software decode and with h264 
there are still delays of up to 1 second between frames, because it 
seems to take a long time to decode each piece, which can be seen in the 
logs. It is much better at this with mediacodec. With mpeg2 it is also 
much better at 120x with software decode.

I suggest set the playback profile to only select software decode for 
mpeg2 - to cater for the pixellating problem, and use mediacodec for others.

If this is OK I will cherry-pick it to v30 in a few days.

Peter