View source for Creating Moviegrams

First get the width, length and framerate of the movie you want to create a moviegram of:

 # mediainfo -f movie.avi | grep '\(Width\|Frame \(rate\|count\)\)'

Find out the ratio at which to play the movie:

 # echo '3 k ''<fps>'' ''<number of frames>'' ''<movie width>'' / / p' | dc

This will probably result in a number smaller than <code>1.0</code>.

Now cut the single frames out of the movie:

 # avconv -i movie.avi -vsync 1 -r ''rate'' image-%04.pnm

Cut a single column from all those frames:

 # for i in `seq 1 ''width''`; do f="$(seq -f %04g $i $i)"; pamcut -left "$(($i- 1))" -width 1 < "image-${f}.pnm" > "col-${f}.pnm"; done

Combine all the columns into a single image:

 # pnmcat -lr col-0*.pnm > part-1.pnm # pnmcat can only open 1024 files at once so we have to process it in smaller batches
 # pnmcat -lr col-1*.pnm > part-2.pnm
 # pnmcat -lr part-*.pnm | pnmtopng > moviegram.png