lavf: default .ogg audio to libvorbis if we can

Since 2007, the Xiph.org Foundation recommends that .ogg only be used
for Ogg Vorbis audio files.

Source: http://wiki.xiph.org/index.php/MIME_Types_and_File_Extensions

However we only do it if we have libvorbis available because the
built in vorbis encoder is not as good.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
dnxhddec: return proper error code

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
arm: Remove a stray .fpu directive

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
asvenc: free avctx->coded_frame on codec close
mxfdec: free descriptor extradata in .read_close()

Fixes memleak in fate-mxf-demux.
vp8: fix PPC assembly to work if src_stride != dst_stride

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Janne Grunau <janne-libav@jannau.net>
dnxhd: Support DNx444

Bug-Id: 99
Bug-Id: videolan/9620
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
hevc: Conceal zero td

It was done only in check_mvset(), while mv_scale() is called also by
dist_scale().

Sample-Id: 00001579-google
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org