HEVC playback issues

[Mateusz Krawczyński]

HEVC video files fail to render videos on my tablet with Core M-5y10c and HD 5300. Sound works and so do subtitles, but instead of a video, there is a grey background.

On my desktop PC with i5 and GTX 970 everything works, so I think here is an issue with software rendering fallback, since GTX 970 supports hardware HEVC decoding, but HD 5300 doesn't.

Since usually weaker devices lacks HEVC decoding support (so software one is a no-go), temporary solution could be to enforce HEVC transcoding, like in Kodi.

[Fredrik Zetterlund]

I'm adding a option to UserPreferences -> Playback to Force Hevc transcoding until MS has an API to detect hardware support

[Fredrik Zetterlund]

Option to disable HEVC Fixes issue #96: HEVC playback issues

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