I need to synchronize events to an mp4/aac file.  I'm using MediaPlayer for
playback and checking elapsed time from start in order to determine when it
is time for successive events.  I also periodically synchronize the elapsed
time with MediaPlayer getCurrentPosition.

>From what I'm seeing, accuracy of getCurrentPosition can vary significantly
- i.e. I'm finding a case now (Xperia M2 on 4.4.2) where what I actually
hear is about 800 ms delayed from what is reported by getCurrentPosition,
but on a different device and OS version (Nexus 7 on 4.2) it's right on.

What could be causing the inaccuracy?  Is there anyway to calibrate to
eliminate it? If not, is there a better way to synchronize events to
mp4/aac files?

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