This is especially useful to debug queue overflow issues.

Ideally we should be able to set the debug message at the
dualinput/framesync level, but they do not have the information related
to the filter context and the inlink, so cannot access much useful
information.

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

The image size of the destination image was used to determine if a source
image was positioned outside the destination image, that no intersection
could occur.  Actually for these two cases the size of the source image
has to be used!

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

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

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

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

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

This is shorter and consistent across filters.

With the introduction of AVFilterContext->is_disabled, we can simplify
the custom passthrough mode in filters.

This commit is technically a small compat break, but the timeline was
introduced very recently.

Doxy by Stefano Sabatini.

This is mostly automated global search and replace

The deprecated aconvert filter is disabled, if it still has users
it should be updated

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

Based on vf_hue.c code.

Wanted-By: ubitux

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

This expression is useful to enable/disable overlaying on the fly.

Note that this can't be easily done relying on the filtergraph structure,
since this implies caching issues or a null frame overlaying in the best
case, which is better avoided for performance and convenience reasons.

Add support for dynamic x, y expressions evaluation.

Also add support for an evaluation mode which allows to disable per-frame
evaluation, so that there is no speedloss in case the expression does not
depend on frame variables.

The PTS of the input frames must be interpreted according to the input
timebase, which is not the same as the output timebase.

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

Partially rework the iteration logic, in order to limit iteration only
for the clipped overlay region.

Also ensure that format is valid in query_formats

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

In particular, fix misbehavior in case main and overlay input formats
mismatch (e.g. YUV420 and YUV444).

Force termination when the overlay stream ends. Simplify scripting logic,
for example when an infinite source is used to generate a background for
a composite video.

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

EAGAIN is used internally in the code; it currently does not make
sense as a return code from the next filter.

Should fix CID966655.

Simplify.

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

Simplify.

Any alleged performance benefits gained from the split are purely
mythological and do not justify added code complexity.

Same calculation as for RGBA etc to create unpremultiplied output.
Useful for creating an intermediate "Mix/Effects bank", in vision mixer
(switcher) terminology.

Example command:

ffmpeg -i input.mov -vf
"[in]scale=iw:ih:interl=1,format=yuv420p[bg];movie=BBC_blocks_watermark.png,scale=iw:ih:interl=1,format=yuva420p[dog];movie=Kickabout_strap.mov,scale=iw:ih:interl=1,format=yuva420p[strap];[strap][dog]overlay=0:0[me1];[bg][me1]overlay=0:0,scale=0:0:interl=1[out]"
-b:v 3M -an output.mov

Fix trac ticket #549.

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>