Skip to content
MappleCare Community ↗

MappleCare Community

[Solved] Apple TV 4K encountering Apple TV 4K eARC Audio Dropouts with Soundbar / AVR after update (tvOS 18.1)

Find answers from other Apple users or start a discussion about your device.

All Forum Rooms

Home › Forums › HomeKit, Apple TV & Smart Home › [Solved] Apple TV 4K encountering Apple TV 4K eARC Audio Dropouts with Soundbar / AVR after update (tvOS 18.1)

Viewing 2 posts - 1 through 2 (of 2 total)
  • Author
    Posts
  • November 14, 2026 at 8:59 pm #12250
    Frances Schmid
    Senior Specialist (Lvl 8)
    Diagnostic Hardware Specs: Apple TV 4K (3rd Gen) | OS Version: tvOS 18.1 | Archive Source: Apple Support Community #256477544

    I am running into a persistent issue on my Apple TV 4K (3rd Gen) running tvOS 18.1.
    Whenever the machine encounters HDMI 2.1 eARC bandwidth handshake failure and Dolby Atmos MAT audio payload truncation, the following diagnostic log appears in Console:

    audiouxd: [AudioFormat] eARC stream packet overflow: dropping Dolby Atmos metadata frame at 0xc3a1

    I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

    MacBook Air 15″ M3 (24GB) | LG UltraFine 5K | Apple Pencil Pro | Tokyo, JP
    Product Designer & Design Systems Lead | "Verified Apple Discussions Archive"
    November 14, 2026 at 8:59 pm #12251
    Owen Parker
    Apple Master (Lvl 10)
    Apple Recommended / Verified Community Solution
    This canonical solution was verified and marked as solved in the Apple Support Community archive.

    Replacing with certified 48Gbps Ultra High Speed HDMI cable and verifying eARC pass-through mode.

    Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

    1. Ensure HDMI cable is certified Ultra High Speed 48Gbps (HDMI 2.1); 18Gbps cables will dropout during Atmos MAT transmission.
    2. In tvOS Settings > Video and Audio > Audio Output, set Audio Format to Auto, Dolby Atmos.
    3. In TV HDMI CEC settings, ensure eARC is set to Pass-through / Bitstream, not PCM stereo.

    Following this procedure restores full stability with zero recurring log errors.

    iPhone 15 Pro | Apple Watch Series 10 | Denver, CO
    Apple Certified Support Professional (ACSP) | Field Photographer
  • Author
    Posts
Viewing 2 posts - 1 through 2 (of 2 total)
  • You must be logged in to reply to this topic.