Broken playback of VP9 in webm

MobileVLCKit version: 3.0.0a51.

Example project and videos (SFW): https://gitlab.com/Chupik/broken-webm-example (Podfile included).

Xcode version: 9.2.

Devices: iPhone SE (iOS 11.2.2), iPhone Simulator x86-64 (iOS 11.2).

Build schemes: debug, release.

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