2012-04-{0x--1x}

Good settings for H264 encoding.
The "presets", requesting a video "quality" of e.g. 1 (enormously high) to 50 (abysmal),
for type "film" or "animation" appear a better choice than demanding a mean bitrate
as we've done earlier.

For large, sharp HQ video, a quality of 25 gives very large files, and somewhere 
between 26 and 28 seems reasonable.  But for low-quality input (typical smallish avi Xvid)
the output even at 26 is considerably worse than the input and has very small size 
(e.g. ~620x350 28 mins, ~50--70MB video).  It seems a single "quality" setting isn't
really what we're after.