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I thought that something like this may work: ffmpeg -r 1/5 -i y-01.png -r 1 -i y-02.png -c:v mpeg4 -vf "fps=2,format=yuv420p" out.mp4 It does not. The first image is displayed, only. Kind regards from Poland, zb.
zb, You could create a short, temporary intermediate video for each frame: ffmpeg -r 1/5 -i y-01.png -c:v mpeg4 -vf "fps=2,format=yuv420p" out.mp4 ffmpeg -r 1/10-i y-02.png -c:v mpeg4 -vf "fps=2,format=yuv420p" out.mp4 5seconds for the first and 10seconds for the second ( and so on and so forth... ) Then concatenate each video: FFmpeg FAQ: How can I join video files? <http://ffmpeg.org/faq.html#How-can-I-join-video-files_003f> FFmpeg Wiki: How to concatenate (join, merge) media files <https://trac.ffmpeg.org/wiki/How%20to%20concatenate%20%28join%2C%20merge%29%20media%20files> This will allow you to do what you need to from the command line but this is a very awkward and cumbersome way. Probably be much easier to use a video editor.