DiaporamaFormatError: Timeline item can't be understood as a segment.

[Lauwisme]

I'm trying to add a video in an generated slideshow. But every way I try, if the video is in de json I get this error.

{ "generator": { "version": "0.6.0", "url": "https://github.com/gre/diaporama-maker" }, "timeline": [ { "duration": 1500, "transitionNext": { "duration": 1000 }, "image": "fPuLkQNXRUKI6HQ2cMPf_IMG_4761.jpg" }, { "duration": 2500, "transitionNext": { "duration": 1000 }, "video": { "video/mp4": "bbb_sunflower_1080p_30fps_normal.mp4" } }, { "duration": 5100, "transitionNext": { "duration": 1000 }, "image": "photo-1421930451953-73c5c9ae9abf.jpg" }, { "duration": 4000, "transitionNext": { "duration": 1000 }, "image": "photo-1423483641154-5411ec9c0ddf.jpg" } ] }