Don’t get too excited everyone, but I’ve found some mighty useful command line tools for processing certain files in Kubuntu - pictures and film to be specific. As this is the time of the year for photos and home videos, I post them here for reference.
For images
convert input.jpg -resize 800 -font /usr/share/fonts/truetype/freefont/FreeSans.ttf -pointsize 10 -draw "gravity SouthWest fill black text 1,1 'signature' fill white text 2,2 'signature'" output.jpg
Will resize and add a signature to input.jpg.
for img in `ls *.jpg`
do
convert $img -resize 800 -font /usr/share/fonts/truetype/freefont/FreeSans.ttf -pointsize 10 -draw "gravity SouthWest fill black text 1,1 'signature' fill white text 2,2 'signature'" sd\_$img
done
Will resize and add a signature to all jpg images in a directory appending sd_ to the filename for the exported images.
For film
mencoder -ovc lavc -oac copy -vf eq2=1:1.4:0.3:1,rotate=1 input.avi -o output.avi
Will re-encode input.avi with unchanged alpha, 140% the original contrast, 30% more brightness and retain the original saturation, i.e. a:c:b:s. It will also rotate the video on to it’s right edge (90° CW).
mencoder input.avi -of rawaudio -oac mp3lame -srate 8000 -ovc copy -o output.mp3
Will extract the audio from a movie file and convert it to mp3.
mencoder -audiofile "dye scene.wav" -o ~/dye_scene.avi "dye scene.m1v" -ovc xvid -oac mp3lame -lameopts abr:br=92 -xvidencopts fixed_quant=6
Conversely, this will ‘mux’ together a video and an audio file.
ls [0-9]*.avi |
while read file
do
mencoder -oac mp3lame -ovc xvid -xvidencopts fixed_quant=5 -mc 0 -noskip "$file" -o "xvid.$file"
done
Loop through a directory, re-encoding the avi’s which begin with a number, with the xvid codec for video and mp3lame for audio.
For archives
To make a tar.gz archive:
tar czvf myfolder.tar.gz abcfolder/