for i in $(seq 0 10); do convert -size 320x240 xc:white -font Palatino-Bold -pointsize 72 -fill black -draw "text 20,55 '`printf %02d $i`' " img`printf %02d $i`.png ; done
avconv -r 1 -i "img%02d.png" -r 1 -vcodec mpeg4 test.avi
where the two -r indicate the input rate (in fps) and the output rate
sources:
http://www.linuxandlife.com/2012/09/how-to-create-simple-text-image-with.html
http://superuser.com/questions/624567/ffmpeg-create-a-video-from-images#12160155
https://trac.ffmpeg.org/wiki/Create%20a%20video%20slideshow%20from%20images
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