Can FragmentedMP4 mode be used for Playback stream from the web SDK?

No, it is currently only available for Live.

Thank you, Teodor.

@Teodor Hadjistoyanov​ Might be a silly question, but why is it only available for live?

Because it is very hard to play backwards or with speed different from 1. We can easily implement it when you do a regular playback with play forward and speed 1 but the challenges comes when you are not in this scenario.