Factors for scale filter
Fixed factor for scale filter
Documentation for scale filter factor
Documentation for scale filter factor
Merge branch 'scale-filter-factor' of https://github.com/lkiesow/FFmpeg

* 'scale-filter-factor' of https://github.com/lkiesow/FFmpeg:
  Documentation for scale filter factor
  Documentation for scale filter factor
  Fixed factor for scale filter
  Factors for scale filter

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_scale: do aspect ratio and scale factor compensation together

Fixes rounding error

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_scale: simplify alignment code

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