[theora] Black borders on resized videos

[Torrance]

Hi there,

I've been playing around with Beta 2 of ffmpeg2theora, or rather the  
macosx build provided at http://firefogg.org/nightly/

Thanks for all the hard work - its great to see some really noticeable  
improvements.

I have one bug to report: upon resizing (down) all manner of content  
(all h.264, however) I am noticing thin black borders - about 4 or 5  
pixels large, sometimes just on one border, sometimes on more than  
one, and apparently random in the side on which they appear. Besides  
being annoying, the presence of the borders also destroys the feeling  
of 'crispness' of the transcoded video by introducing a fuzzy external  
border.

Is this bug known?

Thanks,
Torrance

P.S. I can provide examples both of the commands given and the  
resulting videos if necessary.