Media

Videos

ffmpeg -i input.mpg -ar 22050 -ab 64 -f flv -s 320x240 -r 29.970 -b 1000k -y output.flv

-ar -- is the Audio sample rate ie, 11050, 22050, 44144, and 48000
-ab -- is the Audio Bitrate ie, 64Kbits, 128Kbits, 384Kbtis, etc.
-r ---- is the Frame Rate or fps of the finished video, ie 24, 25, 29.970 etc.
-b ---- is the Bitrate you want to set the flv video to ie, 360k, 1000k etc.

# better
mencoder input.mpeg -ovc lavc -lavcopts vcodec=mpeg4:mbd=2:trell -oac copy -vf scale=360:240 -o output.avi

# worse
ffmpeg -i input.avi -b 1000 -s 640x480 -vcodec mpeg4 -r 30000/1001 output.avi

# or
ffmpeg -i M2U00009.MPG  -ar 44100 -ab 128k -s 720:480 -padtop 46 -padbottom 50 -padcolor 000000 -ss 00:00:40 -t 00:02:55  -f mp4 grok3.avi

# for android
https://help.ubuntu.com/community/AndroidVideoEncoding

Images

convert -resize '320x240!' 002.jpg thmb_002.jpg

Screenshot

sudo apt-get install scrot
scrot
# or
sleep 10 && scrot
# or
scrot -e 'mv $f /your/pictures'