doc/demuxers: fix image2 examples

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avfilter/vf_rotate: use vsub for output plane height calculation

Output plane height used horizontal instead of vertical subsampling.
This is just cosmetic change as filter does not support formats where
vertical subsampling does not match horizontal one.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
avcodec/tiff_common: fix bprint max sizes

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>