I’m trying to play home made video’s (Apple Final Cut Pro X) in surround mode via my Human 5200. Video file is in m4v format and has a AC3 (Dolby Digital) codec included. When streamed via my AppleTV the amplifier switches to Dolby Digital mode, when copied to- and played via the Human it stays in stereo mode.

Already tried to rename the extension to mp4 as this is a more common standard but still no difference.

Can anybody advice on possibilities to play in surround mode?

Thanks!