want to convert a avi file to flv? extract the sound from a flv file and save it as mp3? see below:

1. Getting info from a video file

ffmpeg -i video.avi

2. Turn a sequence of images into video

ffmpeg -f image2 -i image%d.jpg video.mpg

3. Turn a video into a sequence of images

ffmpeg -i video.mpg image%d.jpg

4. Encode video for Ipod/IPhone

ffmpeg -i source_video_file.avi -acodec aac -ab 128kb -vcodec mpeg4 -b 1200kb -mbd 2 -flags +4mv -trell 1 -aic 2 -cmp 2 -subcmp 2 -s 320×180 -title X output_file.mp4

5. Encode video for PSP

ffmpeg -i source_video_file.avi -b 300 -s 320×240 -vcodec xvid -ab 32 -ar 24000 -acodec aac output_file.mp4ORffmpeg -i “OriginalFile.avi” -f psp -r 29.97 -b 768k -ar 24000 -ab 64k -s 320×240 “OutputFile.mp4”

6. Extract audio from a video file and save it as mp3 format

ffmpeg -i source_video_file.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 output_file.mp3

7. Convert a wave file to mp3

ffmpeg -i original_audio_file.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 output_file.mp3

8. Convert a avi video to mpeg

ffmpeg -i original_movie.avi output_file.mpg

9. Convert a mpeg video to avi

ffmpeg -i original_movie.mpg output_file.avi

10. Convert a avi video to uncompressed animated gif

ffmpeg -i original_movie.avi output_file.gif

11. Add audio to an existing video-only file (mix audio and video)

ffmpeg -i son.wav -i original_movie.avi output_file.mpg

12. Convert a avi video to flv (flash video)

ffmpeg -i original_movie.avi -ab 56 -ar 44100 -b 200 -r 15 -s 320×240 -f flv output_file.flv

13. Convert a flv video to mpeg

ffmpeg -i myFile.flv -ab 56 -ar 22050 -b 500 -s 320×240 myFile.mpg

14. Convert a avi video to dv

ffmpeg -i original_movie.avi -s ntsc -r ntsc -aspect 4:3 -ar 48000 -ac 2 output_file.dvORffmpeg -i original_movie.avi -target ntsc-dv output_file.dv

15. Convert a avi video to mpeg specifically for DVD creation

ffmpeg -i source_video.avi -target ntsc-dvd -ps 2000000000 -aspect 16:9 finale_video.mpeg

16. Compress a avi video to Divx

ffmpeg -i original_movie.avi -s 320×240 -vcodec msmpeg4v2 output_file.avi

17. Convert a Ogg Theora video to mpeg specifically for DVD creation

ffmpeg -i original_movie.ogm -s 720×576 -vcodec mpeg2video -acodec mp3 output_file.mpg

18. Convert a avi video to mpeg2 for SVCD creation

ffmpeg -i original_movie.avi -target ntsc-svcd output_file.mpg

19. Convert a avi video to mpeg2 for VCD creation

ffmpeg -i original_movie.avi -target ntsc-vcd output_file.mpg