[mythtv] mythweb/mythbackend not generating previews

[Chris Petersen]

> I think this is related to an issue I am seeing where the total time
> for the program is jumping about wildly.
> I looks like its only happing on shows that have been automaticaly
> transcoded to mpeg4 from mpeg2

Mine are all mpeg4 original sources.. Although I've transcoded out the 
commercials.  (just checked -- a fresh recording isn't showing up, either).

> I am about to update to cvs now to see if it resolves the issue I am a
> few days behind, if not I will post more info.

Keep me posted.

-Chris