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VIA: http://martin-thoma.com/converting-files-with-linux/

Converting Files with Linux September 21st, 2011 No Comments

The following tipps work under a linux terminal: Image Files

If you want to change image files via terminal, ImageMagick is a good choice.

Resize Images to a maximum resolution

convert "YourOldPicture.jpg" -resize 1600x1600 "YourNewPicture.jpg"

Create a Black-and-white picture and compress it:

djpeg "YourOldPicture.jpg" | ppmtopgm | cjpeg -qual 70 >"YourNewPicture.jpg"

Rename Pictures:

rename -n ’s/\.jpg$/\.JPG/’ *.jpg

Audio Files

Give all mp3 songs the same sound level (it’s called Audio normalization):

mp3gain -a *.mp3

Merge many audio files to one:

mp3wrap merged.mp3 one.mp3 two.mp3

Convert all *.wav-files in one folder two *.mp3-files and remove the *.wav-files:

for i in *.wav;do lame "$i" "${i%wav}mp3"; rm "$i"; done

Video Files

For quite a lot purposes is the command line tool FFmpeg with its lots of options a good choice. For others might MEncoder be better. You might also want to install some codecs first:

sudo apt-get install libavcodec-extra-52 libavdevice-extra-52 libavformat-extra-52 libavutil-extra-50 libpostproc-extra-51 libswscale-extra-0 libavcodec-unstripped-52 ubuntu-restricted-extras

Merge many video files to one:

cat One.mpg Two.mpg Three.mpg | ffmpeg -f mpeg -i - -vcodec copy -acodec copy "Merged.mpg"

avi2mpg:

ffmpeg -i "Original.avi" "New.mpg"

mp42mpg:

ffmpeg -i "Original.mp4" -target ntsc-vcd "New.mpg"

mod2avi: ?

vcd2avi:

mencoder vcd://2 -o "New.avi" -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=2000

ogv2avi:

mencoder "Original.ogv" -ovc xvid -oac mp3lame -xvidencopts pass=1 -o "New.avi"

wmv2mpg: aspect=16/9 should eventually be changed to 4/3 or other aspects

mencoder -of avi -ofps 25 \

 -oac mp3lame -lameopts cbr:br=112:aq=3:mode=0:vol=0 \
 -vf hqdn3d,softskip,harddup \
 -ovc xvid \
 -xvidencopts bitrate=501:max_key_interval=37:aspect=16/9:turbo:nochroma_me:notrellis:max_bframes=0:vhq=0 \
 Original.wmv \
 -o New.avi

mkv2avi:

mencoder "Original.mkv" -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=6000 -oac mp3lame -lameopts vbr=3 -o "New.avi"