Oh, I tried again some config changes and finally figured it out. Constrain ALL videos to default aspect ratio (Default Width: 1920 Height: 1080) did it. I know that I had changed width and height. But I must have missed to choose “ALL”.
Sorry to bother you and thanks for the great plugin!
I haven’t found any solution yet. I set up a small test website with two sample videos so that you can have a look:
https://tinyurl.com/videopacktest
As configuration changes haven’t been successful I kept all default values within this test website. I only chose a thumbnail and added a caption.
One additional information: I use the block editor and add the videos by putting the videopack shortcode in a html-Block. Is that a problem?
Your help is very much appreciated!