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。
视频转码工具FFmpeg 2014-07-15发布2.3正式版.新的产品系列。之前产品线为2.2.5 2.1.4,1.2.6.上个产品系列是2014-03-24的2.2 FFmpeg在视频网站应该是必用的转码工具。
完全改进：
- version 2.3:
- - AC3 fixed-point decoding
- - shuffleplanes filter
- - subfile protocol
- - Phantom Cine demuxer
- - replaygain data export
- - VP7 video decoder
- - Alias PIX image encoder and decoder
- - Improvements to the BRender PIX image decoder
- - Improvements to the XBM decoder
- - QTKit input device
- - improvements to OpenEXR image decoder
- - support decoding 16-bit RLE SGI images
- - GDI screen grabbing for Windows
- - alternative rendition support for HTTP Live Streaming
- - AVFoundation input device
- - Direct Stream Digital (DSD) decoder
- - Magic Lantern Video (MLV) demuxer
- - On2 AVC (Audio for Video) decoder
- - support for decoding through DXVA2 in ffmpeg
- - libbs2b-based stereo-to-binaural audio filter
- - libx264 reference frames count limiting depending on level
- - native Opus decoder
- - display matrix export and rotation api
- - WebVTT encoder
- - showcqt multimedia filter
- - zoompan filter
- - signalstats filter
- - hqx filter (hq2x, hq3x, hq4x)
- - flanger filter
- - Image format auto-detection
- - LRC demuxer and muxer
- - Samba protocol (via libsmbclient)
- - WebM DASH Manifest muxer
- - libfribidi support in drawtext
http://ffmpeg.org/releases/ffmpeg-2.3.tar.bz2
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