Came across the following subject, for those who want to use the sync playback to display;
http://forum.xbmc.org/showthread.php?t=58951
Video clock will cause jerks to keep a/v sync and drop/dupe will cause audio artifacts.
So it depends what bothers you the most.
In both cases you have to make sure your video can be played on the refreshrate without changing the speed, for example if you have 29.97 fps video your refreshrate will have to be exactly 59.94 hertz, if it’s a little bit higher your video will play slightly too fast and you’ll get jerks or skipped audiopackets.
If you want almost perfect sync you should set the synctype to drop/dupe, play a video for about an hour or so and examine the log for skipped or duplicated audiopackets, the length of the audiopackets together with the interval at which they’re dropped/duplicated will tell you how much the refreshrate is off.
This all doesn’t matter when using resample because the PI will keep perfect a/v sync all the time.
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