On Fri, 8 Feb 2019 at 02:46, Ted Park <kumowoon1025 at gmail.com> wrote: > ffmpeg -i pipe:3 -filter:v loop=loop=25*3:size=1 -c:v mpeg4 -r 25 video.mp4 3<input.jpg It works, thanks. Using "loop=loop=-1:size=1" to loop infinitely also worked for me.