ffmpeg image to video frame length

hi i am useing ffmpeg to convert images into videos but images loads very fast and movie end very shortly how can i add a delay in images

开发者_运维百科

i am useing this command

ffmpeg -r 10 -b 1800 -i %03d.jpg  -vframes 100 abc.avi

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Lower the -r value, you have it currently set to 10 frames per second.