Ffmpeg

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ffpmeg is a conversion utility for various flavors of video to various other flavors, you can read about it here

[edit] ffmpeg

detect 

ffmpeg -i filename.avi

convert reference 

 ffmpeg -i tufftrucks1001.avi -ar 22050 -ab 32 -f flv -s 600x400 tufftruck1001.flv
 ffmpeg  -i 00304_VideoTraxx.mov -ar 22050 -ab 56 -b 200 -r 12 -f flv -s 600x400 -acodec mp3 -ac 1 00304.flv
 ffmpeg  -i 00299_VideoTraxx.mov -ar 43242 -b 200 -r 12 -f flv -s 600x400 -acodec mp3 -ac 1 00304.flv

this one works 

 ffmpeg  -i 00299_VideoTraxx.mov -ar 43242 -f flv -s 600x400 00304.flv

options 

 -ar audio sampling freq., default = 44100Hz
 -b bitrate, default = 200kb/s
 -f force format (output)
 -r frame rate fps
 -s size 
 -t time limit, how long of video you want to output
 -y overwrite the output file, if it exists

thumbnail 

 fmpeg -i tufftrucks1001.avi -s 174x116 -ss 5 -vframes 1 -f mjpeg -y test1.jpg
 ffmpeg -i tufftruck3.flv -s 174x116 -an -ss 4 -vframes 1 -f image2 -y test1.jpg
 ffmpeg -i swing.avi -s 320×240 -ss 5 -vframes 1 -f image2 swing.jpg
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