FFmpeg is a complete, cross-platform solution to record, convert and stream audio and video. It includes libavcodec - the leading audio/video codec library.Video Examples:
* Converting MOV to FLV using FFMPEG
ffmpeg -i movie1.mov movie1.flv
This will convert movie1.mov file to movie1.flv
* Converting Mpeg to FLV using FFMPEG
ffmpeg -i movie1.mpeg movie1.flv
This will convert movie1.mpeg file to movie1.flv
* Converting AVI to FLV using FFMPEG
ffmpeg -i movie1.avi -s 500×500 movie1.flv
This will convert movie1.avi file to movie1.flv and will resize the video resolution to 500×500
* Converting 3GP to FLV using FFMPEG
ffmpeg -i movie1.3gp -sameq -an movie1.flv
This will convert movie1.3gp file to movie1.flv and will keep the original file settings and will disable the audio content
* Converting MPEG to 3GP using FFMPEG
ffmpeg -i movie1.mpeg -ab 8.85k -acodec libamr_wb -ac 1 -ar 16000 -vcodec h263 -s qcif movie2.3gp
* FFV1 Encoding
ffmpeg -i
* Converting flv to mpg using FFMPEG
ffmpeg -i myvideo.flv -ar 22050 -b 500 -s 320x240 myvideo.mpg
Audio Examples:
* Converting aac to mp3 using FFMPEG with MetaData
ffmpeg -i audio1.aac -ar 22050 -ab 32 -map_meta_data audio1.mp3:audio1.aac audio1.mp3
This will convert audio1.aac to audio1.mp3 having audio rate 22.05 Khz and Audio BitRate 32Khz and will copy the meta data from .aac file to .mp3 file
* Converting WMV to MP3 using FFMPEG
ffmpeg -i audio1.wmv audio1.mp3
This will convert audio1.wmv file to audio1.mp3
* Converting WMV to FLV using FFMPEG
ffmpeg -i audio1.wmv audio1.flv
This will convert audio1.wmv file to audio1.flv, this will generate only audio content
* Converting AMR to MP3 using FFMPEG
ffmpeg -i audio1.amr -ar 22050 audio1.mp3
This will convert audio1.amr file to audio1.mp3 having audio rate 22.05 Khz
* Converting aac to mp3 using FFMPEG
ffmpeg -i audio1.aac -ar 22050 -ab 32 audio1.mp3
This will convert audio1.aac to audio1.mp3 having audio rate 22.05 Khz and Audio BitRate 32Khz
* Rip MP3 From Video
ffmpeg -i movie.flv -vn -acodec copy movie.mp3
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source:http://linuxpoison.blogspot.com/2009/08/135781757116119.html