I have a series of screenshots from a demo that I want to put in a video. I am using ffmpeg for this purpose. The command is ffmpeg -f image2 -i screenshot_%5d.png -vcodec mpeg4 demo.avi. However, the video length is shorter than what I want, and it moves very fast. How do I specify how many images per second I want? I tried the -r argument but that did not work.

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