ffmpeg timelaps

ffmpeg timelaps reading files in natural order instead of lexicographic:
```sh
cat $(find photos/ -maxdepth 1 -name "*.jpg" -print  | sort -V) | ffmpeg -framerate 30 -i - -s:v 1280x720 -c:v libx264 -crf 17 -pix_fmt yuv420p timelapsv2.mp4
```