duration properties are basically required for the redaktor client.
We do not want to disrupt/tatter/break the aspect ratios of esteemed users images by putting them in a square and for a masonry layout, we need at least to know, if it is “landscpe”, “square”, “portrait” – and:
For performance benefits (e.g. in card stream or row overview), the media is loaded via Intersection Observer.
So, for a pleasant visual experience it is required that the concrete aspect ratio is known in order to paint the box.
If we have media without metadata like in WebVTT, we can also load
Video by Intersection Observer and setting
preload="none" – but we would still like to show the duration above the post …
If any of those arrives at redaktor server, it can measure and enhance the object.
It might be supernice, if we know it in advance (I agree with 99.9% of the protocol but this would have been a must for me …)