RK3229 box - can not select SPDIF as passthrough device.

    Hello,

    I am trying to set up a MXR 4K box with a RK3229 chip,

    I am running community build LE9.20 (Kodi 18.5)

    I have a Logitech Z-5450 Speaker/amp set with Dolby Digital (AC3) and DTS support with SPDIF optical and Coax input

    I also have a Samsung LCD (2011)


    The problem is getting passthrough to work with my SPDIF (COAX) out.

    In the audio devices I can select SPDIF and by doing so I can get stereo to work (because the Kodi transcode's the audio to PCM and with SPDIF coax that means I only get two channels (stereo)

    The problem is that , at the passthrough options I can NOT select another device (greyed out) also , changing the Audio device itself does NOT change anything at passthrough.

    When I enable passthrough now and use my Samsung LCD also to passthrough I can get Dolby Digital to work (goes from Kodi HDMI to my Samsung and than passthrough to the optical SPDIF from my logitech (say's Dolby Digital than)

    I can sadly not use that methode for DTS because my samsung (like most TV's) wont passthrough DTS)

    What could be the reason I can not select my SPDIF as an output device for passthrough ?

    what would cause this to be greyed out ?

    I dont think there is anything wrong with the libreelec install since my SPDIF works as normal output device, and passthrough is also working for HDMI, I just cant select any other output for passthrough :(


    I am probably doing something stupid , so have fun pointing that out to me and help me out :) :) :)


    thank you,

    Hans

    Some screenshots ;

    Quote from mo123

    LibreELEC doesn't support passthrough for Rockchip devices.

    Ok, that explains alot :)

    Would be nice if the "passthrough" option would be greyed out than :(

    I am guesing it is do to missing rockchip drivers (from rockchip themselves) and wont be fixed until rockchip brings out drivers ??


    thank you for your answer.

    Quote from mo123

    LibreELEC doesn't support passthrough for Rockchip devices.

    But what does it mean for future ?
    1. no patch for LE is possible
    2. it is a matter of patching "rk3399-rock-pi-4.dtb"
    3. it is not hardware possible

    Please comment - this functionality is really awaited for as it changes sound experience vastly nowadays.

    Quote from tuhajbej6

    But what does it mean for future ?
    1. no patch for LE is possible
    2. it is a matter of patching "rk3399-rock-pi-4.dtb"
    3. it is not hardware possible

    Please comment - this functionality is really awaited for as it changes sound experience vastly nowadays.

    It is hardware possible.

    A LibreELEC developer just has to add a working patch for Rockchip devices, test it and build a new image.

    Eg. for Allwinner devices these patches add audio passthrough - Allwinner: WIP audio passthrough · jernejsk/LibreELEC.tv@87cbddb · GitHub

    So something similar with a few changes could work on Rockchip devices too.

    But they first want to improve video playback I heard so audio passthough will likely take the back seat for another couple of months unless independent developers can do tests and create a patch.

    Quote from mo123

    It is hardware possible.

    A LibreELEC developer just has to add a working patch for Rockchip devices, test it and build a new image.

    Eg. for Allwinner devices these patches add audio passthrough - Allwinner: WIP audio passthrough · jernejsk/LibreELEC.tv@87cbddb · GitHub

    So something similar with a few changes could work on Rockchip devices too.

    But they first want to improve video playback I heard so audio passthough will likely take the back seat for another couple of months unless independent developers can do tests and create a patch.

    Thanks for clarifying.

    I see it was commited in July.. So nobody willing took care of it yet for Rockchip?
    Not sure how the development goes - where can we put request in this case ?