发布于 2015-05-17 22:55:29 | 391 次阅读 | 评论: 0 | 来源: 网友投递
FFmpeg 多媒体处理工具
FFmpeg是一个开源免费跨平台的视频和音频流方案，属于自由软件，采用LGPL或GPL许可证（依据你选择的组件）。它提供了录制、转换以及流化音视频的完整解决方案。它包含了非常先进的音频/视频编解码库libavcodec，为了保证高可移植性和编解码质量，libavcodec里很多codec都是从头开发的。
FFmpeg是一个开源免费跨平台的视频和音频流方案，属于自由软件，采用LGPL或GPL许可证（依据你选择的组件）。它提供了录制、转换以及流化音视频的完整解决方案。它包含了非常先进的音频/视频编解码库libavcodec，为了保证高可移植性和编解码质量，libavcodec里很多codec都是从头开发的。
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