ffmpeg2: Very late update to 2.8.15

version 2.8.15:
- avcodec/dvdsub_parser: Allocate input padding
- avcodec/dvdsub_parser: Init output buf/size
- avcodec/imgconvert: fix possible null pointer dereference
- swresample/arm: rename labels to fix xcode build error
- avformat/utils: fix mixed declarations and code
- libwebpenc_animencoder: add missing braces to struct initialization
- avformat/movenc: Check input sample count
- avcodec/mjpegdec: Check for odd progressive RGB
- avformat/movenc: Check that frame_types other than EAC3_FRAME_TYPE_INDEPENDENT have a supported substream id
- avformat/mms: Add missing chunksize check
- avformat/pva: Check for EOF before retrying in read_part_of_packet()
- avcodec/indeo4: Check for end of bitstream in decode_mb_info()
- avcodec/shorten: Fix undefined addition in shorten_decode_frame()
- avcodec/jpeg2000dec: Fixes invalid shifts in jpeg2000_decode_packets_po_iteration()
- avcodec/jpeg2000dec: Check that there are enough bytes for all tiles
- avcodec/escape124: Fix spelling errors in comment
- avcodec/ra144: Fix integer overflow in ff_eval_refl()
- avcodec/cscd: Check output buffer size for lzo.
- avcodec/escape124: Check buf_size against num_superblocks
- avcodec/mjpegdec: Check for end of bitstream in ljpeg_decode_rgb_scan()
- avcodec/aacdec_fixed: Fix undefined integer overflow in apply_independent_coupling_fixed()
- avutil/common: Fix undefined behavior in av_clip_uintp2_c()
- fftools/ffmpeg: Fallback to duration if sample rate is unavailable
- avformat/mov: Only set pkt->duration to non negative values
- avcodec/h264_mc_template: Only prefetch motion if the list is used.
- avcodec/xwddec: Use ff_set_dimensions()
- avcodec/wavpack: Fix overflow in adding tail
- avcodec/shorten: Fix multiple integer overflows
- avcodec/shorten: Sanity check nmeans
- avcodec/mjpegdec: Fix integer overflow in ljpeg_decode_rgb_scan()
- avcodec/truemotion2: Fix overflow in tm2_apply_deltas()
- avcodec/opus_silk: Change silk_lsf2lpc() slightly toward silk/NLSF2A.c
- avcodec/amrwbdec: Fix division by 0 in find_hb_gain()
- avformat/mov: replace a value error by clipping into valid range in mov_read_stsc()
- avformat/mov: Break out early if chunk_count is 0 in mov_build_index()
- avcodec/fic: Avoid some magic numbers related to cursors
- avcodec/g2meet: ask for sample with overflowing RGB
- avcodec/aacdec_fixed: use 64bit to avoid overflow in rounding in apply_dependent_coupling_fixed()
- avcodec/mpeg4videoenc: Use 64 bit for times in mpeg4_encode_gop_header()
- avcodec/mlpdec: Only change noise_type if the related fields are valid
- indeo4: Decode all or nothing of a band header.
- avformat/mov: Only fail for STCO/STSC contradictions if both exist
- avcodec/dirac_dwt: Fix integer overflow in COMPOSE_DD97iH0 / COMPOSE_DD137iL0
- avcodec/fic: Check available input space for cursor
- avcodec/g2meet: Check RGB upper limit
- avcodec/jpeg2000dec: Fix undefined shift in the jpeg2000_decode_packets_po_iteration() CPRL case
- avcodec/jpeg2000dec: Skip init for component in CPRL if nothing is to be done
- avcodec/g2meet: Change order of operations to avoid undefined behavior
- avcodec/flac_parser: Fix infinite loop
- avcodec/wavpack: Fix integer overflow in DEC_MED() / INC_MED()
- avcodec/error_resilience: Fix integer overflow in filter181()
- avcodec/h263dec: Check slice_ret in mspeg4 slice loop
- avcodec/elsdec: Fix memleaks
- avcodec/vc1_block: simplify ac_val computation
- avcodec/ffv1enc: Check that the crc + version combination is supported
- lavf/http.c: Free allocated client URLContext in case of error.
- avcodec/dsicinvideo: Fail if there is only a small fraction of the data available that comprises a full frame
- avcodec/dsicinvideo: Propagate errors from cin_decode_rle()
- avcodec/dfa: Check dimension against maximum
- avcodec/cinepak: Skip empty frames
- avcodec/cinepak: move some checks prior to frame allocation
- swresample/arm: remove unintentional relocation.
- doc/APIchanges: Fix typos in hashes
- avformat/utils: Check cur_dts in update_initial_timestamps() more
- avcodec/utils: Enforce minimum width also for VP5/6
- avcodec/truemotion2: Propagate out of bounds error from GET_TOK()
- avcodec/mjpegdec: Check input buffer size.
- lavc/libopusdec: Allow avcodec_open2 to call .close
- avcodec/movtextdec: Check style_start/end
- avcodec/aacsbr_fixed: Fix integer overflow in sbr_hf_assemble()
- swresample/swresample: Fix for seg fault in swr_convert_internal() -> sum2_float during dithering.
- avcodec/aacdec_fixed: Fix integer overflow in apply_independent_coupling_fixed()
- avcodec/cscd: Error out when LZ* decompression fails
- avcodec/imgconvert: Fix loss mask bug in avcodec_find_best_pix_fmt_of_list()
- avcodec/wmalosslessdec: Fix null pointer dereference in decode_frame()
- avcodec/tableprint_vlc: Fix build failure with --enable-hardcoded-tables
- avcodec/get_bits: Make sure the input bitstream with padding can be addressed
- avformat/mov: Check STSC and remove invalid entries
- avcodec/nuv: rtjpeg with dimensions less than 16 would result in no decoded pixels thus reject it
- avcodec/nuv: Check for minimum input size for uncomprssed and rtjpeg
- avcodec/wmalosslessdec: Reset num_saved_bits on error path
- avformat/mov: Fix integer overflows related to sample_duration
- avformat/oggparseogm: Check lb against psize
- avformat/oggparseogm: Fix undefined shift in ogm_packet()
- avformat/avidec: Fix integer overflow in cum_len check
- avformat/oggparsetheora: Do not adjust AV_NOPTS_VALUE
- avformat/utils: Fix integer overflow of fps_first/last_dts
- libavformat/oggparsevorbis: Fix memleak on multiple headers
- avcodec/bintext: sanity check dimensions
- avcodec/utvideodec: Check subsample factors
- avcodec/smc: Check input packet size
- avcodec/cavsdec: Check alpha/beta offset
- avcodec/diracdec: Fix integer overflow in mv computation
- avcodec/jpeg2000dwt: Fix integer overflows in sr_1d53()
- avcodec/diracdec: Use int64 in global mv to prevent overflow
- avformat/hvcc: zero initialize the nal buffers past the last written byte

(nia)