Audio Passthrough not working on a N100 System

    • New

    Hi,

    I am on a GMKTEC G5. N100 CPU.

    All works except audio passthrough. The mediacenter is directly connected to my Hisense AX5125H soundbar (which supports up to Dolby Atmos, DTS-HD etc), and itself is connected to Hisense U8N via eARC.

    I always see that the soundbar only receives PCM despite DTS or DD+ Tracks.

    Here is debug log when running a DTS example.

    External Content pastebin.com
    Content embedded from external sources will not be displayed without your consent.
    Through the activation of external content, you agree that personal data may be transferred to third party platforms. We have provided more information on this in our privacy policy.

    The output HDMI Port seems to support the streaming options:

    2024-10-16 10:32:00.095 T:920 info <general>: m_deviceName : hdmi:CARD=PCH,DEV=0
    2024-10-16 10:32:00.095 T:920 info <general>: m_displayName : HDA Intel PCH
    2024-10-16 10:32:00.095 T:920 info <general>: m_displayNameExtra: HEC HISENSE on HDMI #0
    2024-10-16 10:32:00.095 T:920 info <general>: m_deviceType : AE_DEVTYPE_HDMI
    2024-10-16 10:32:00.095 T:920 info <general>: m_channels : FL, FR, LFE, FC, BC, BL, BR, FLOC, FROC, BLOC, BROC, TFC, TC, TFL, TFR, UNKNOWN1
    2024-10-16 10:32:00.095 T:920 info <general>: m_sampleRates : 32000,44100,48000,88200,96000,176400,192000
    2024-10-16 10:32:00.095 T:920 info <general>: m_dataFormats : AE_FMT_RAW,AE_FMT_S32NE,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_RAW
    2024-10-16 10:32:00.095 T:920 info <general>: m_streamTypes : STREAM_TYPE_AC3,STREAM_TYPE_DTSHD,STREAM_TYPE_DTSHD_MA,STREAM_TYPE_DTSHD_CORE,STREAM_TYPE_DTS_1024,STREAM_TYPE_DTS_2048,STREAM_TYPE_DTS_512,STREAM_TYPE_EAC3,STREAM_TYPE_TRUEHD

    From my limited understanding it looks like its not being passed through but reencoded into PCM:

    2024-10-16 10:31:49.309 T:1577 info <general>: CDVDAudioCodecFFmpeg::Open() Successful opened audio decoder dca

    2024-10-16 10:31:49.309 T:1577 info <general>: Creating audio thread

    2024-10-16 10:31:49.924 T:921 debug <general>: CActiveAESink::OpenSink - ALSA Initialized:
    2024-10-16 10:31:49.924 T:921 debug <general>: Output Device : HDA Intel PCH
    2024-10-16 10:31:49.924 T:921 debug <general>: Sample Rate : 48000
    2024-10-16 10:31:49.924 T:921 debug <general>: Sample Format : AE_FMT_S32NE
    2024-10-16 10:31:49.924 T:921 debug <general>: Channel Count : 6
    2024-10-16 10:31:49.924 T:921 debug <general>: Channel Layout: FL, FR, FC, LFE, SL, SR
    2024-10-16 10:31:49.924 T:921 debug <general>: Frames : 2400
    2024-10-16 10:31:49.924 T:921 debug <general>: Frame Size : 24


    I already read some other threads but couldnt come up with anything.


    Thanks

    • New

    Recommendation for the dev team: If someone enables passthrough then enable it for all formats by default...it makes no sense I have to go into Expert mode and enable them manually despite the main passthrough being enabled already. :)

    • New
    Quote from randorando

    Recommendation for the dev team: If someone enables passthrough then enable it for all formats by default...it makes no sense I have to go into Expert mode and enable them manually despite the main passthrough being enabled already. :)

    Not really.

    A TV supporting AC3 passthrough is quite common.

    A TV supporting DTS passthrough is quite rare.

    A TV supporting DTS-HD/TrueHD passthrough is almost unheard of.


    Enabling passthrough on a device that doesn't support it, will at best produce silence and possibly loud white noise.