#time lapse the images
ffmpeg -f image2 -i %04d.jpg -r 30 -s hd1080 -vcodec libx264 time-lapse.mp4
#2x video speed
ffmpeg -i time-lapse.mp4 -filter:v "setpts=0.5*PTS" time-lapse-fast.mp4
https://www.ffmpeg.org/faq.html#How-do-I-encode-single-pictures-into-movies_003f
https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video
Rename the images into sequential numbering with Thunar’s built in batch rename feature.