Kodi encoding to LPCM 24 bits multichannel Audio / Amlogic S905/905X

hundrakg · September 12, 2018 at 8:30 AM

Letting Kodi encode DTS HD MA and True HD to LPCM 5.1/7.1 channel Audio with Amlogic S905/905X will always downgrade to 16 bits instead of the orginal 24 bits.

From what I understand there is a vesion now that will decode to LPCM 24 bits, and that is LibreELEC-S905.arm-8.2.5-Chroma.422.10bit.

IS this the only one that will do this? Or is there more version that can do this?

hundrakg · September 13, 2018 at 10:18 AM

nobody?

the problem is there is no way to confirm 24 bits in a receiver, you need special hdmi analyzer for that.

I guess I have to accept that LibreELEC-S905.arm-8.2.5-Chroma.422.10bit probably is the only version supporting 24 bits LPCM 5.1 sound...

Tim_Taylor · September 13, 2018 at 10:33 AM

Most people will use passthrough and let AVR decode

**wrxtasy** · September 13, 2018 at 11:35 AM

Quote from hundrakg

Letting Kodi encode DTS HD MA and True HD to LPCM 5.1/7.1 channel Audio with Amlogic S905/905X will always downgrade to 16 bits instead of the orginal 24 bits.

From what I understand there is a vesion now that will decode to LPCM 24 bits, and that is LibreELEC-S905.arm-8.2.5-Chroma.422.10bit.

IS this the only one that will do this? Or is there more version that can do this?

Just keep following the version number as they increase, all previous additions are included in subsequent versions.

Otherwise look at the file dates:

ie v8.2.5.1 is the version after 8.2.5

v8.2.5.2 will be the next version after 8.2.5.1 and so on...

You need specialist audio equiptment to actually test bit perfect 24bit audio output as detailed in this Vero 4K development thread:

24-bit output - Vero 4K / Vero 4K + - OSMC Forums

And yes the 24bit Kernel HDMI output signalling changes talked about in that thread are in the LE v8.2.5.x versions onwards.

hundrakg · September 13, 2018 at 3:14 PM

thanks !!!!!!! sounds great...

hundrakg · September 13, 2018 at 3:15 PM

Quote from Tim_Taylor

Most people will use passthrough and let AVR decode

If I could I would

My receivers only accepts LPCM in lossless sound formats, It dont do DTS HD MA or Dolby TRUE HD...

Thats why its important to me to get LPCM 5.1 in 24 bits....

hundrakg · September 13, 2018 at 3:26 PM

Quote from wrxtasy

Just keep following the version number as they increase, all previous additions are included in subsequent versions.

Otherwise look at the file dates:

ie v8.2.5.1 is the version after 8.2.5

v8.2.5.2 will be the next version after 8.2.5.1 and so on...

You need specialist audio equiptment to actually test bit perfect 24bit audio output as detailed in this Vero 4K development thread:

24-bit output - Vero 4K / Vero 4K + - OSMC Forums

And yes the 24bit Kernel HDMI output signalling changes talked about in that thread are in the LE v8.2.5.x versions onwards.

Display More

One thing more:

What is the difference between:

LibreELEC-S905.arm-8.2.5-Chroma.422.10bit.img.gz

downloaded 2018-08-20, size: 125 833 107 byte

LibreELEC-S905.arm-8.2.5-Chroma.422.10bit.img.gz

downloaded 2018-09-01, size: 125 842 349 byte

Same namne, different sizes.....

I cant see the later one is called 8.2.5.1