FFmpeg 2.6.3 发布，多媒体处理工具

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#深圳# 6月10日 亚马逊AWSome Day云计算免费培训报名中
　　FFmpeg是一套可以用来记录、转换数字音频、视频，并能将其转化为流的开源计算机程序。它包括了目前领先的音/视频编码库libavcodec。 FFmpeg是在Linux下开发出来的，但它可以在包括Windows在内的大多数操作系统中编译。这个项目是由Fabrice Bellard发起的，现在由Michael Niedermayer主持。可以轻易地实现多种视频格式之间的相互转换，例如可以将摄录下的视频avi等转成现在视频网站所采用的flv格式。
　　FFmpeg 2.6.3 发布，此版本现已提供下载：http://ffmpeg.org/releases/ffmpeg-2.6.3.tar.bz2。
　　该版本更新日志如下：
　　- avcodec/libtheoraenc: Check for av_malloc failure
　　- ffmpeg_opt: Fix -timestamp parsing
　　- hevc: make avcodec_decode_video2() fail if get_format() fails
　　- avcodec/cavsdec: Use ff_set_dimensions()
　　- swr: fix alignment issue caused by 8ch sse functions
　　- avcodec/mjpegdec: fix len computation in ff_mjpeg_decode_dqt()
　　- avcodec/jpeg2000dec: fix boolean operator
　　- avcodec/hevc_ps: Explicitly check num_tile_* for negative values
　　- avformat/matroskadec: Cleanup error handling for bz2 & zlib
　　- avformat/nutdec: Fix use of uinitialized value

　　- tools/graph2dot: use larger data types than int for array/string>　　- avformat/matroskaenc: Check ff_vorbiscomment_length in put_flac_codecpriv()
　　- avcodec/mpeg12dec: use the correct dimensions for checking SAR
　　- xcbgrab: Validate the capture area
　　- xcbgrab: Do not assume the non shm image data is always available
　　- avfilter/lavfutils: disable frame threads when decoding a single image
　　- avformat/mov: Do not read ACLR into extradata for H.264
　　- ffmpeg: remove incorrect network deinit
　　- OpenCL: Avoid potential buffer overflow in cmdutils_opencl.c
　　- libvpxenc: only set noise reduction w/vp8
　　- vp9: remove another optimization branch in iadst16 which causes overflows.
　　- lavf: Reset global flag on deinit
　　- network: Do not leave context locked on error
　　- vp9: remove one optimization branch in iadst16 which causes overflows.
　　- fate: Include branch information in the payload header
　　- avformat/utils: Ensure that AVFMT_FLAG_CUSTOM_IO is set before use
　　- avformat/img2dec: do not rewind custom io buffers
　　- avcodec/alsdec: Use av_mallocz_array() for chan_data to ensure the arrays never contain random data
　　- avcodec/atrac3plusdsp: fix on stack alignment
　　- swresample/swresample-test: Randomly wipe out channel counts
　　- swresample: Check channel layouts and channels against each other and print human readable error messages
　　- swresample: Allow reinitialization without ever setting channel layouts (cherry picked from commit 80a28c7509a11114e1aea5b208d56c6646d69c07)
　　- swresample: Allow reinitialization without ever setting channel counts

　　- dashenc: replace attribute>　　- avformat/matroskaenc: Use avoid_negative_ts_use_pts if no stream writes dts
　　- avformat/mux: Add avoid_negative_ts_use_pts
　　- tests/fate-run: do not attempt to parse tiny_psnrs output if it failed
　　- cafdec: free extradata before allocating it
　　- imgutils: initialize palette padding bytes in av_image_alloc
　　- aacdec: don't return frames without data

　　->　　- avi: Validate sample_size
　　- aacsbr: break infinite loop in sbr_hf_calc_npatches
　　- diracdec: avoid overflow of bytes*8 in decode_lowdelay
　　- diracdec: prevent overflow in data_unit_size check
　　- avformat/matroskadec: Use tracks[k]->stream instead of s->streams[k]
　　- matroskadec: use uint64_t instead of int for index_scale
　　- pngdec: don't use AV_PIX_FMT_MONOBLACK for apng
　　- pngdec: return correct error code from decode_frame_common
　　- nutdec: fix illegal count check in decode_main_header
　　- nutdec: fix memleaks on error in nut_read_header
　　- apedec: prevent out of array writes in decode_array_0000
　　- apedec: set s->samples only when init_frame_decoder succeeded
　　- swscale/ppc/swscale_altivec.c: POWER LE support in yuv2planeX_8() delete macro GET_VF() it was wrong
　　- alac: reject rice_limit 0 if compression is used
　　- alsdec: only adapt order for positive max_order
　　- bink: check vst->index_entries before using it
　　- mpeg4videodec: only allow a positive length
　　- aacpsy: correct calculation of minath in psy_3gpp_init
　　- alsdec: validate time diff index
　　- alsdec: ensure channel reordering is reversible
　　- ac3: validate end in ff_ac3_bit_alloc_calc_mask
　　- aacpsy: avoid psy_band->threshold becoming NaN

　　- aasc: return correct buffer>　　- matroskadec: export cover art correctly
　　- mxfenc: don't try to write footer without header
　　- mxfenc: fix memleaks in mxf_write_footer
　　- rtpenc_mpegts: Set chain->rtp_ctx only after avformat_write_header succeeded
　　- rtpenc_mpegts: Free the right ->pb in the error path in the init function