yum方式安装ffmpeg步骤

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1、安装所需软件

yum install -y automake autoconf libtool gcc gcc-c++

2、安装第三方更新源

rpm -ivhhttp://apt.sw.be/redhat/el6/en/i386/rpmforge/RPMS/rpmforge-release-0.5.3-1.el6.rf.i686.rpm

3、安装ffmpeg

yum install ffmpeg ffmpeg-devel

会自动安装众多解码器，ffmpeg版本为0.6.5-1.el6.rf。看了下yum安装的解码器版本还不是很旧，但是ffmpeg版本较老。

4、测试一下
将一个.avi视屏转为.flv格式

ffmpeg -i Destination.avi -y -ab 56 -ar 22050 -r 15 -sameqtest2.flv

转换前后两个文件的格式比较：
转换前

Destination.avi
   General
     Complete name : E:PVDestination.avi
     Format : AVI
     Format/Info : Audio Video Interleave
     Format/Family : RIFF
     File size : 79.5 MiB
     PlayTime : 4mn 1s
     Bit rate : 2754 Kbps
     StreamSize : 469 KiB
     Subject : doobie (2007)
     Writing application : VirtualDubMod 1.5.10.2 (build2540/release)
     Writing library : VirtualDubMod build 2540/release
   Video #0
     Codec : XviD
     Codec/Family : MPEG-4
     Codec/Info : XviD project
     Codec profile : Streaming Video Profile/Level 1
     Codec settings/PacketBitStream : Yes
     Codec settings/BVOP : Yes
     Codec settings/QPel : No
     Codec settings/GMC : 0
     Codec settings/Matrix : Default
     PlayTime : 4mn 1s
     Bit rate : 2556 Kbps
     Width : 640 pixels
     Height : 480 pixels
     Display Aspect ratio : 4/3
     Frame rate : 29.976 fps
     Resolution : 8 bits
     Chroma : 4:2:0
     Interlacement : Progressive
     Bits/(Pixel*Frame) : 0.277
     StreamSize : 73.5 MiB
   Audio #1
     Codec : MPEG-1 Audio layer 3
     Codec profile : Joint stereo
     PlayTime : 4mn 1s
     Bit rate : 190 Kbps
     Bit rate mode : CBR
     Channel(s) : 2 channels
     Sampling rate : 48 KHz
     Resolution : 16 bits
     StreamSize : 5.47 MiB
     Writing library : Gogo (after 3.0)

转换后

test2.flv
   General
     Complete name : E:PVtest2.flv
     Format : Flash Video
     File size : 45.0 MiB
     PlayTime : 4mn 1s
     Bit rate : 1564 Kbps
   Video
     Codec : Sorenson H263
     PlayTime : 4mn 1s
     Bit rate : 195 Kbps
     Width : 640 pixels
     Height : 480 pixels
     Display Aspect ratio : 4/3
     Frame rate : 15.000 fps
     Bits/(Pixel*Frame) : 0.042
   Audio
     Codec : MPEG-1 Audio Layer 3
     Bit rate : 55 bps
     Channel(s) : 2 channels
     Sampling rate : 22 KHz
     Resolution : 16 bits

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