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。
2013-10-28发布2.1.之前产品线为2.0.2 1.2.4,1.1.5,1.0.7.FFmpeg在视频网站应该是必用的转码工具。
完全改进:
version 2.1: - aecho filter - perspective filter ported from libmpcodecs - ffprobe -show_programs option - compand filter - RTMP seek support - when transcoding with ffmpeg (i.e. not streamcopying), -ss is now accurate even when used as an input option. Previous behavior can be restored with the -noaccurate_seek option. - ffmpeg -t option can now be used for inputs, to limit the duration of data read from an input file - incomplete Voxware MetaSound decoder - read EXIF metadata from JPEG - DVB teletext decoder - phase filter ported from libmpcodecs - w3fdif filter - Opus support in Matroska - FFV1 version 1.3 is stable and no longer experimental - FFV1: YUVA(444,422,420) 9, 10 and 16 bit support - changed DTS stream id in lavf mpeg ps muxer from 0x8a to 0x88, to be more consistent with other muxers. - adelay filter - pullup filter ported from libmpcodecs - ffprobe -read_intervals option - Lossless and alpha support for WebP decoder - Error Resilient AAC syntax (ER AAC LC) decoding - Low Delay AAC (ER AAC LD) decoding - mux chapters in ASF files - SFTP protocol (via libssh) - libx264: add ability to encode in YUVJ422P and YUVJ444P - Fraps: use BT.709 colorspace by default for yuv, as reference fraps decoder does - make decoding alpha optional for prores, ffv1 and vp6 by setting the skip_alpha flag. - ladspa wrapper filter - native VP9 decoder - dpx parser - max_error_rate parameter in ffmpeg - PulseAudio output device - ReplayGain scanner - Enhanced Low Delay AAC (ER AAC ELD) decoding (no LD SBR support) - Linux framebuffer output device - HEVC decoder, raw HEVC demuxer, HEVC demuxing in TS, Matroska and MP4 - mergeplanes filter
下载:http://ffmpeg.org/releases/ffmpeg-2.1.tar.bz2