FFmpeg 2.6.3 發布，多媒體處理工具

FFmpeg是一套可以用來記錄、轉換數字音頻、視頻，并能將其轉化為流的開源計算機程序。它包括了目前領先的音/視頻編碼庫libavcodec。 FFmpeg是在Linux下開發出來的，但它可以在包括Windows在內的大多數操作系統中編譯。這個項目是由Fabrice Bellard發起的，現在由Michael Niedermayer主持。可以輕易地實現多種視頻格式之間的相互轉換，例如可以將攝錄下的視頻avi等轉成現在視頻網站所采用的flv格式。

FFmpeg 2.6.3 發布，此版本現已提供下載：http://ffmpeg.org/releases/ffmpeg-2.6.3.tar.bz2。

該版本更新日志如下：

• 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 numtile* 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
  
  來自：http://www.oschina.net/news/62523/ffmpeg-2-6-3