Change the mappings separator from comma to '|' to avoid excessive
escaping, since comma is already used for separating filters in the
filtergraph description.

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

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

Based on patch by Anton Khirnov
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

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

Also reorder some other #include when applicable.

A number of compilers, for example those from TI and IBM, choke on
these initialisers.  The current style is also quite ugly.
Signed-off-by: NMans Rullgard <mans@mansr.com>

Signed-off-by: NMans Rullgard <mans@mansr.com>

Signed-off-by: NMartin Storsjö <martin@martin.st>

This allows the iteration callbacks to discover the internal class and
options, and show them when required.

Signed-off-by: NMartin Storsjö <martin@martin.st>

This reduces from 3 to 2 messages for the same syntax error in ffprobe,
and from 4 to 3 in filters.

The warning silenced was:
libavfilter/af_join.c: In function ‘join_request_frame’:
libavfilter/af_join.c:451:9: warning: ‘nb_samples’ may be used uninitialized in this function [-Wuninitialized]

It is not used in any filters currently and is inherently evil. If
passing binary data to filters is required in the future, it should be
done with some AVOptions-based system.

It joins multiple input streams into one multi-channel output.