@Sibshops @Tusky Every video I try cannot be played. With #Fedilab for example it works, in #Tusky not. So, it shouldn't be the phone, except Fedilab comes with codecs exclusively for the app, but I doubt it is so. So what else could be the reason? Thanks
Edit: And no, I can't see this video. After pressing the play button it seems it's loading, then comes a black screen with the message "cannot play this video" (screenshot shows the german message) and that's it. Always the same.