ffmpeg  -r 24 -start_number 32 -i DSC_%04d.JPG -s hd1080 -vcodec libx264 timelapse.mp4

# -r 24 - output frame rate
# -start_number 32 - if filenames don't start at 0000, then specify start number
# -i DSC_%04d.JPG - e.g. DSC_0397.JPG
# -s hd1080 - 1920x1080 resolution