mp3enc: add an option for disabling the Xing frame.
mp3enc: allow omitting the id3v2 header with -id3v2_version 0
avconv: print a warning when falling back to default 25fps
yuv4mpeg: set average frame rate
buffersrc: handle non-refcounted frames in av_buffersrc_add_frame() correctly
avisynth: fix setting packet properties

Reviewed-by: Stephen Hutchinson <qyot27@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Prepare for 10_alpha2 Release
h264: reset first_field if frame_start() fails for missing refs

In this case we may not have a current frame, while first_field being
set implies we do.

Fixes invalid reads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
h264: limit allowed pred modes in ff_h264_check_intra_pred_mode() to 3

Higher modes are not allowed for 16x16/chroma, which is what this
function is used for. Otherwise this function would return 0 (vertical
prediction) for invalid higher modes, which could result in invalid
reads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
h264: do not call field_end if we do not have a current picture

Fixes invalid reads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
h264: prevent two matching fields from being both a short/long ref combination

Fixes possible access to freed memory.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
h264: reset ref count if decoding the slice header fails

Otherwise the ER code might try to use some already freed references.

Fixes possible access to freed memory.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
h264: reset num_reorder_frames if it is invalid

An invalid VUI is not considered a fatal error, so the SPS containing it
may still be used. Leaving an invalid value of num_reorder_frames there
can result in writing over the bounds of H264Context.delayed_pic.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
h264: check that an IDR NAL only contains I slices

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
ac3: set default matrix encoding modes in parse_frame_header.

Deduplicates some code.
(e)ac3: parse and store the Lt/Rt and LFE mix levels.
(e)ac3: clip surround mix level indexes.

Values 0-2 are reserved, 3 (-1.5dB) should be used instead.
eac3: cosmetics, re-indent.
lavc: allow the caller to override dimensions in ff_get_buffer()

This will be useful for allocating edges in the encoders.
mpegvideo: allocate edges when encoding.

Allocating edges will be removed from generic code, so the encoder must
handle this explicitly.