lavfi/cropdetect: add support for named options
yadif: restore speed of the C filtering code

Always use the special filter for the first and last 3 columns (only).

Changes made in 64ed397 slowed the filter to just under 3/4 of what it
was.  This commit restores the speed while maintaining identical output.

For reference, on my Athlon64:
1733222 decicycles in old
2358563 decicycles in new
1727558 decicycles in this

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
tiff: fix handling of metadata with refcounted frames

Since the conversion to refcounted frames, the tiff decoder
only wrote the metadata into its internal "picture" in its own context,
never exposing the metadata to the user, and eventually leaking the
metadata.

Instead, properly store the metadata directly into the frame being decoded into.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavfi/avcodec: cleanup includes

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavfi/avcodec: fix API version checks

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