Video & Audio

Take screenshot of the desktop

import -window root [fileName]
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Take webcam photo

uvccapture -d/dev/video0 -oscreenURC.jpg -m
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Play text by computer voice

spd-say "I am a robot"
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Play sound file in wav format

aplay /usr/share/sounds/alsa/Noise.wav
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play /usr/share/sounds/alsa/Noise.wav
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The classical way to play a beep sound through the PC speakers

beep
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Mute volume

amixer set Master mute
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pactl set-sink-mute 0 1
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Turn images to a video sequence

ffmpeg -f image2 -i image%d.jpg [fileName].mpg
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Turn a video to images

ffmpeg -i video.mpg image%d.jpg
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Convert sound from a video to mp3

ffmpeg -i source_video.avi -vn -ar 44100 -ac 2 -ab 192k -f mp3 sound.mp3
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Convert mpg to avi

ffmpeg -i video_origine.mpg video_finale.avi
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Convert avi to mpg

ffmpeg -i video_origine.avi video_finale.mpg
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Convert avi to flv

ffmpeg -i video_origine.avi -ab 56 -ar 44100 -b 200 -r 15 -s 320x240 -f flv video_finale.flv
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Convert avi to animated gif

ffmpeg -i video_origine.avi gif_anime.gif
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Convert gif to webp

gif2webp [inputFile] -o [outputFile]
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Convert png/jpg to webp

img2webp [inputFile] -o [outputFile]
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