which made it using default quality settings which are really bad for camera
tracking (and perhaps for CSE too).
haven't found Jpeg quality setting for FFmpeg which will behave in the same way
as quality setting for image sequence, but seems that mapping image quality
from 1..100 UI range to 31..1 range of qmin/qmax gives expected result.
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svn merge -r44228:44230 ^/branches/soc-2011-tomato