avframe: note that linesize is not the usable data size
lavfi: allow user-provided execute() callbacks
Merge commit '38e15df1489d86c016515223ee693e7d0326c56a'

* commit '38e15df1489d86c016515223ee693e7d0326c56a':
  avframe: note that linesize is not the usable data size

Conflicts:
	libavutil/frame.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  lavfi: allow user-provided execute() callbacks

Conflicts:
	libavfilter/avfilter.h
	libavfilter/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Convert multiplier for MV from int to ptrdiff_t.

This prevents emulated_edge_mc from not undoing mvy*stride-related
integer overflows.

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