ffmpeg

FFmpeg : http://ffmpeg.mplayerhq.hu/
Unofficial FFmpeg Win32 Builds :  http://arrozcru.no-ip.org/ffmpeg_builds/


flv 변환예제
ffmpeg.exe  -y -i input.wmv -ar 22050 -qmax 10 output.flv

-ar rate            set audio sampling rate (in Hz)
-qmax              <int>   E.V.. max video quantizer scale (VBR)


이미지 추출 예제
ffmpeg.exe -y -i "%1" -ss 0:0:10.0 -vframes 1 -vcodec png -y -f image2 "%1.png"

-ss time_off        set the start time offset
-vframes number     set the number of video frames to record
-vcodec codec       force video codec ('copy' to copy stream)