choppy video when upgraded to alpha 3

[martinl]

Hello!

I have some mkv files with 720p video (H264, ac3) which all previous versions of xbian played great. When I have switched to alpha 3 I get the following behavior:

- Video becomes choppy or pauses while audio stays fine
- After the video is choppy for a bit, it does a strange 'fast forward' to catchup to the audio.

What has changed? Is there some update or setting change which has now causing this choppiness?

I have never changed any of the video settings. I have always left everything as default except for changing the overscan stuff from within xbmc.

I am not sure it is related, but one other big change I noticed was that with alpha3 the subtitles are now much cleaner. Before they had extra timing info and junk displayed in them (the same thing mplayer used to do a few years ago) but now they are nice and clean and formated around the display properly.

Any suggestions on what I could try to get rid of the choppiness?

(Note that on all the other RaspberryPi XBMC distributions these same mkv files always have had the above choppy behavior.)

Thanks!