log: Have function parameter names match between .c and .h file

This fixes two related Doxygen warnings.
buffersrc: Have function parameter names match between .c and .h file

This fixes two related Doxygen warnings.  Also document one parameter.
aacdec: set AVFrame sample_rate

AVFrame.sample_rate is set in ff_get_buffer, but aacdec calls
ff_get_buffer before the samplerate is known. So it needs to be
set again before returning the frame.
asfdec: check ff_get_guid() return values during seeking

Hitting EOF during seeking is quite likely. Fixes use of uninitialized
data during fate-seek-lavf-asf.
asfdec: short-circuit seeking to the start of stream

Bug-id: 43

Signed-off-by: Janne Grunau <janne-libav@jannau.net>
asfdec: fix seeking with fragmented packets

After seeking fragments with an offset > 0 must be skipped to correctly
assemble packets.

Bug-Id: 43
Add libx265 encoder

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
vp9: add fate sample for parallelmode.

This disables backward probability updates, which makes the codec more
friendly for frame-level multi-threading.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
vp9: add a new segmentation sample.

The old one didn't use segmentation. One uses segmentation in all frame
types (--aq-mode=1), and the other uses all segmentation features, but
only in inter frames (mbgraph).

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