Native, with more features, filter is available.
Signed-off-by: NPaul B Mahol <onemda@gmail.com>

Signed-off-by: NPaul 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.

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

Native filter have reached similar performance.
Signed-off-by: NPaul B Mahol <onemda@gmail.com>

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

Except for the vintage preset, the values are defined by Lou Logan based
on the ones found in Adobe Photoshop CS6.
Signed-off-by: NClément Bœsch <ubitux@gmail.com>
Signed-off-by: NLou Logan <lou@lrcd.com>

It is supposed to be used with mencoder only and does
nothing when used with ffmpeg.
Signed-off-by: NPaul B Mahol <onemda@gmail.com>

This is more consistent with the naming in the rest of Libav.

This makes possible the raise of one picture if the input has less than
the number of frames to analyze.

Fixes Ticket1992.

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.

The filter has been natively integrated into libavfilter.
Signed-off-by: NPaul B Mahol <onemda@gmail.com>

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

Allow to select sample rates.

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

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