[FFmpeg-user] Encode single pictures to movies

[Tom Mackey]

Hi,
My first post to the list.  I have 6 jpg images named img1.jpg etc up to
img6.jpg.  I have tried to encode them to a single movie with a 5 second
display for each using the following command:
 ffmpeg -f image2 -r 1/5 -i img%d.jpg out.mp4

The output file has only the first 3 images in it and is obviously 15
seconds long.
Any suggestions as to why my command does not pick up images 4,5 and 6?
Jodel