Posts by akostadinov

  • HEVC 10bit on amlogic s905W

    Hello,

    maybe I'm late to the party but found an old box and tried to make something useful out of it.

    I know that the hardware or at least the PRIMEDRM implementation doesn't support h265 10bit hardware acceleration but I wanted to try decode in software.

    Here comes the first issue: configuration is all or nothing. I cannot force software decoding only for HEVC. It would be nice to be able to.

    But then comes the other issue. When I disable hardware acceleration but keep PRIMEDRM, kodi still fails and I see in the log

    Code
    error <general>: CDVDVideoCodecDRMPRIME::GetFormat - no supported pixel formats: yuv420p10le

    When I disable PRIMEDRM entirely, playing the file doesn't lock kodi anymore, I hear the audio but I see no video. The log shows:

    Code
    2026-08-30 07:50:59.652 T:9691    error <general>: virtual bool KODI::WINDOWING::GBM::CWinSystemGbmEGLContext::SetVideoOutput(const VideoPicture*): failed to choose EGL config for 10-bit
2026-08-30 07:50:59.652 T:9691  warning <general>: LinuxRendererGLES::Configure: SetVideoOutput failed
2026-08-30 07:50:59.665 T:9691     info <general>: GLES: Selecting YUV 2 RGB shader

    So my question is how to disable hardware acceleration only for particular formats (could be in some config file, no need to be in the UI), and how to make sure the 10bit format is converted to 8bit before displaying as apparently 10bit output is not supported.

    This can probably make the box much more useful for its intended purpose.

    Thank you!

    P.S. alternatively, if I can still view such videos directly with ffmpeg somehow as a workaround, this I will also appreciate. Now watching so often, if I have a reasonable way to play such files, that will not bother me much.

    -- LibreELEC (chewitt) 12.95.1, AMLGX.aarch64