True HD Atmos as PCM Stereo instead of Multichannel

I found a funky bug (with a workaround) with this update relating to files containing Dolby TrueHD Atmos / 7.1 audio tracks.

Bug: When launching a title (shared via SMB) that uses Dolby TrueHD Atmos / 7.1, normal behavior would have Infuse output the audio track in Multi-Channel LPCM, but instead what happens is Infuse down-mixes to Stereo instead.

Workaround: Files with multiple audio tracks have the advantage of the ability to change to an EAC-3 or AC3 audio track, changing the output to Multi-Channel LPCM. If I switch back to the Dolby TrueHD track the audio remains in Multi-Channel LPCM.

Caveat: If a file only contains a single audio track (Dolby TrueHD), there is no way to “repair” this Stereo bug, unless the user plays another file with multiple audio tracks, one must be Dolby TrueHD, with secondary AC3 or EAC-3 tracks to change to. After doing so, changing back to play the original file properly plays Dolby TrueHD in Multi-Channel LPCM.

If a user doesn’t have multiple audio tracks to flip to & fro, or another file to play with multiple tracks, they’re out of luck, and stuck with a Dolby TrueHD track playing only in Stereo, instead of Multi-Channel LPCM.

  • AppleTV 4K (A2843): tvOS 17.4
  • Infuse v7.7.3
  • LG C1 65 (Input Audio Format: Bitstream, Digital Sound Output: Auto, eARC Support: Enabled)
  • Samsung Q930B to eARC