c=1; while [[ "$(date +"%T")" < '22:00:00' ]]; do out=$(printf "/pathto/%06d.png" $c); ((c++)); /ffmpeg -i http://livestream_url -vframes 1  -vf \ drawtext=fontfile=/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Bold.ttf: \ text=%{localtime:%T}: fontcolor=white@0.8: x=7: y=460 $out; sleep 15; done;