[FFmpeg-user] lenscorrection and vignette filters
astroelectronic at t-online.de
Wed Feb 3 08:53:16 CET 2016
I found a bug in the documentation of the lenscorrection filter:
It's written there "0.5 means no correction" for the coefficients k1 and
This can't be right, or the formula is wrong. It's obvious that the
formula makes no correction if k1=k2=0.
For positive k1 and k2, r_tgt is always smaller than r_src. That means
in the target image there are undefined pixels at the edges. Which color
is used to fill these pixels? There should be a "fillcolor" parameter as
in the rotate filter.
Which formula is used for the vignette filter?
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