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ffmpeg is a multiplatform, open-source library for video and audio files. It is usualy available in your distribution repositories, so search for it and install it. For Ubuntu:
sudo apt-get install ffmpeg
Because certain codecs are not activated for FFmpeg in Ubuntu Jaunty, I suggest you download and install these ffmpeg fixed packages (unfortunately they are available for 32bit only).

Now that you have installed ffmpeg, you can start trying these commands which cover almost all needs: video conversion, sound extraction, encoding file for iPod or PSP, and more:

Getting info from a video file
ffmpeg -i video.avi


Turn X images to a video sequence
ffmpeg -f image2 -i image%d.jpg video.mpg
This command will transform all the images from the current directory (named image1.jpg, image2.jpg, etc...) to a video file named video.mpg.


Turn a video to X images
ffmpeg -i video.mpg image%d.jpg
This command will generate the files named image1.jpg, image2.jpg, ...

The following image formats are also available : PGM, PPM, PAM, PGMYUV, JPEG, GIF, PNG, TIFF, SGI.


Encode a video sequence for the iPpod/iPhone
ffmpeg -i source_video.avi input -acodec aac -ab 128kb -vcodec mpeg4 -b 1200kb -mbd 2 -flags +4mv+trell -aic 2 -cmp 2 -subcmp 2 -s 320x180 -title X final_video.mp4
Explanations :

* Source : source_video.avi
* Audio codec : aac
* Audio bitrate : 128kb/s
* Video codec : mpeg4
* Video bitrate : 1200kb/s
* Video size : 320px x 180px
* Generated video : final_video.mp4


Encode video for the PSP
ffmpeg -i source_video.avi -b 300 -s 320x240 -vcodec xvid -ab 32 -ar 24000 -acodec aac final_video.mp4
Explanations :

* Source : source_video.avi
* Audio codec : aac
* Audio bitrate : 32kb/s
* Video codec : xvid
* Video bitrate : 1200kb/s
* Video size : 320px x 180px
* Generated video : final_video.mp4


Extracting sound from a video, and save it as Mp3
ffmpeg -i source_video.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 sound.mp3
Explanations :

* Source video : source_video.avi
* Audio bitrate : 192kb/s
* output format : mp3
* Generated sound : sound.mp3


Convert a wav file to Mp3
ffmpeg -i source_song.wav -vn -ar 44100 -ac 2 -ab 192 -f mp3 final_song.mp3


Convert .avi video to .mpg
ffmpeg -i source_video.avi final_video.mpg


Convert .mpg to .avi
ffmpeg -i source_video.mpg final_video.avi


Convert .avi to animated gif (uncompressed)
ffmpeg -i source_video.avi animated_gif.gif


Mix a video with a sound file
ffmpeg -i song.wav -i source_video.avi final_video.mpg


Convert .avi to .flv
ffmpeg -i source_video.avi -ab 56 -ar 44100 -b 200 -r 15 -s 320x240 -f flv final_video.flv


Convert .avi to dv
ffmpeg -i source_video.avi -s pal -r pal -aspect 4:3 -ar 48000 -ac 2 final_video.dv
Or:
ffmpeg -i source_video.avi -target pal-dv final_video.dv


Convert .avi to mpeg for dvd players
ffmpeg -i source_video.avi -target pal-dvd -ps 2000000000 -aspect 16:9 final_video.mpeg
Explanations :

* target pal-dvd : Output format
* ps 2000000000 maximum size for the output file, in bits (here, 2 Gb)
* aspect 16:9 : Widescreen


Compress .avi to divx
ffmpeg -i source_video.avi -s 320x240 -vcodec msmpeg4v2 final_video.avi


Compress Ogg Theora to Mpeg dvd
ffmpeg -i source_video.ogm -s 720x576 -vcodec mpeg2video -acodec mp3 final_video.mpg


Compress .avi to SVCD mpeg2

NTSC format:
ffmpeg -i source_video.avi -target ntsc-svcd final_video.mpg
PAL format:
ffmpeg -i source_video.avi -target pal-svcd final_video.mpg


Compress .avi to VCD mpeg2

NTSC format:
ffmpeg -i source_video.avi -target ntsc-vcd final_video.mpg
PAL format:
ffmpeg -i source_video.avi -target pal-vcd final_video.mpg


Multi-pass encoding with ffmpeg
ffmpeg -i source_file -pass 2 -passlogfile ffmpeg2pass final_file-2


You may also want to read about the audio/video encoding guide.

Source korben
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