I have been playing with this on my N800 recently and have noticed some issues. With the default settings and in high motion scenes I see some skipping back and forth a couple frames at a time. As if someone in the scene was putting their foot forward then back again, then they keep walking.

I tried with -ao esd -ac ffmp3, and while a lot more frames get dropped, the skipping back and forth isnt there anymore which i think is more bearable.