In filter init, there's a division by nb_frames but value isn't checked.

A fade out (usually at the end of a video) can easily start beyond
INT32_MAX (about 36 minutes).  Regression since d40dc641.

When slice_h is rounded up due to chroma subsampling, there's
a risk that jobnr * slice_h exceeds frame->height.

Prior to a638e918, this wasn't an issue for the last slice
of a frame, since slice_end was set to frame->height for the last
slice.

a638e918 tried to fix the case where other slices than the
last one would exceed frame->height (which can happen where the
number of slices/threads is very large compared to the frame
height).

However, the fix in a638e918 instead broke other cases,
where slice_h * nb_threads < frame->height. Therefore, make
sure the last slice always ends at frame->height.

CC: libav-stable@libav.org
Signed-off-by: NMartin Storsjö <martin@martin.st>

AVFilterLink.frame_count is supposed to count the number of frames
that were passed on the link, but with min_samples, that number is
not always the same for the source and destination filters.
With the addition of a FIFO on the link, the difference will become
more significant.

Split the variable in two: frame_count_in counts the number of
frames that entered the link, frame_count_out counts the number
of frames that were sent to the destination filter.

CC: libav-stable@libav.org

Libav, for some reason, merged this as a public API function. This will
aid in future merges.

A define is left for backwards compat, just in case some person
used it, since it is in a public header.
Signed-off-by: NDerek Buitenhuis <derek.buitenhuis@gmail.com>

Fixes Ticket4321
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

Signed-off-by: NPaul B Mahol <onemda@gmail.com>

Fixes Ticket #1822.

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

Signed-off-by: NPaul B Mahol <onemda@gmail.com>

Signed-off-by: NPaul B Mahol <onemda@gmail.com>

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

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

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

This more evenly distributes the load between threads

This also fixes the chroma filtering where the filter was applied twice
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

This is shorter and consistent across filters.

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

This should fix several issues with odd dimensions inputs.

lut, vflip, pad and crop video filters also need to be checked for such
issues. It's possible sws is also affected.

Conflicts:

	libavfilter/avfilter.c
	libavfilter/vf_drawtext.c
	libavfilter/vf_lut.c
	libavfilter/vf_select.c
	libavfilter/vf_setpts.c
	libavfilter/vsrc_color.c
	libavfilter/vsrc_movie.c
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

Deprecate AVFilterBuffer/AVFilterBufferRef and everything related to it
and use AVFrame instead.

Remove alpha_pix_fmts[].
Signed-off-by: NPaul B Mahol <onemda@gmail.com>

Signed-off-by: NPaul B Mahol <onemda@gmail.com>