FFmpeg thinks the metadata is invalid

[dancingmirrors]

According to ffprobe, FFmpeg thinks the metadata we inject for SBS video is invalid, yet this injection is required for VLC to switch to 360 mode. Any idea what's up with that? Is there an actual spec for this?

[SeeRich]

Is this what you were seeing?

#335

[dancingmirrors]

IIRC it says "Invalid spherical metadata found while processing input".

[SeeRich]

Ah ok, that isn't what I was seeing. Probably unrelated.