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 sizes - 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 id with contentType for the AdaptationSet element - 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 - id3v2: catch avio_read errors in check_tag - 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 size from aasc_decode_frame - 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 FFmpeg 2.6.3 发布，多媒体处理工具下载地址
