currently I have again many pictures, which I want to bring to the same size/length (e.g. 30 frames).
Currently I select one after the other and size them by mouse, that is good, works fine, but takes a lot of time.
Is there a possibility to select one and that there is a menu (or so): Bring to size 30 frames?
If you don’t mind using another application to do the work you can use autohotkey to trim your images to the exact length you want.
This script will do it. Set the number of loops = to the number of images, the script is set to 5. Set the number of frames, the script is set to 30. Put the images on the timeline.
Position the play head at home position. Run the script. Activate the script using Ctrl + Q.