ffmpeg is an amazing piece of software.
Today I had to create a small video of a few Print-Screens (Screenshots) and this is how I did it:
I’ve renamed all my screenshot png files from a datetime format in their names, into a numeric order.
Screenshot_2017-01-25_13-16-31.png ---> Screenshot_01.png Screenshot_2017-01-25_13-17-12.png ---> Screenshot_02.png ...
after that everything was really easy:
~> ffmpeg -i Screenshot_%2d.png output.mp4
Be careful not to use * wildcard but %2d (two digits) for ffmpeg to iterate through all images.
If your images are something like: 001.png then use %3d (three digits) in your ffmpeg command.
The above command will show us 25 frames per seconds, so …. if you have less than 25 images, you will have a full second to see the entire video!!!
Now it’s time to add a duration delay:
~> ffmpeg -framerate 1/2 -i Screenshot_%2d.png -r 21 output.mp4
that means, convert 21 images with a 2 second delay into output.mp4 video