
I tried without adding this argument and QuickTime fails to play the output mp4 -pix_fmt yuv420p: In order to view the output mp4 in “dumb players” like quicktime, an additional argument of -pix_fmt yuv420p is required to translate the pixel format to QuickTime (and other media players)-compatible, see mentioned in ffmpeg documentation.


Here is my understanding of what each command does: Ffmpeg -r 6 -f image2 -i ele-%03d.jpg -pix_fmt yuv420p stack-up.mp4
