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[SOLVED] 24 bit Output to HDMI downsamples to 16 bit - Printable Version

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24 bit Output to HDMI downsamples to 16 bit - CoppolaVH - 03-11-2021

We are looking at options for 24 bit output over HDMI.

Currently the pi downsamples to 16 bit.   

We understand the Openmax (https://www.khronos.org/openmaxil) is a possible solution that can play 24 bit.  Does anybody have any success in doing so with Openmax, or other solutions to output at 24 bit, please.


RE: 24 bit Output to HDMI downsamples to 16 bit - Tim Curtis - 03-11-2021

What company are you referring to when you say "We"?


RE: 24 bit Output to HDMI downsamples to 16 bit - CoppolaVH - 03-11-2021

(03-11-2021, 01:16 PM)Tim Curtis Wrote: What company are you referring to when you say "We"?

No company, my friend and I who are retired audio enthusiasts.


RE: 24 bit Output to HDMI downsamples to 16 bit - Tim Curtis - 03-11-2021

You should post the issue on raspberry pi linux git.
https://github.com/raspberrypi/linux/issues


RE: 24 bit Output to HDMI downsamples to 16 bit - CoppolaVH - 03-11-2021

(03-11-2021, 02:03 PM)Tim Curtis Wrote: You should post the issue on raspberry pi linux git.
https://github.com/raspberrypi/linux/issues

Yes and I have done so.


RE: 24 bit Output to HDMI downsamples to 16 bit - Tim Curtis - 03-11-2021

Please post the link to the issue so users can track its progress.


RE: 24 bit Output to HDMI downsamples to 16 bit - CoppolaVH - 03-11-2021

(03-11-2021, 02:49 PM)Tim Curtis Wrote: Please post the link to the issue so users can track its progress.
Ok.  Here are the links to issues I posted at github and the pi forum.

https://github.com/raspberrypi/linux/issues/4204

https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=306656&p=1834565#p1834565


RE: 24 bit Output to HDMI downsamples to 16 bit - CoppolaVH - 03-25-2021

(03-11-2021, 03:17 PM)CoppolaVH Wrote:
(03-11-2021, 02:49 PM)Tim Curtis Wrote: Please post the link to the issue so users can track its progress.
Ok.  Here are the links to issues I posted at github and the pi forum.

https://github.com/raspberrypi/linux/issues/4204

https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=306656&p=1834565#p1834565

Was able to get the Justboom Digi Hat hooked up via optical cable, and that solved the 2 channel 24 bit out issue as outlined below:

Encoded at24 bit, 192 kHz, Stereo FLAC
Decoded to24 bit, 192 kHz, Stereo, 3.486 Mbps
DestinationLocal
Output rate24 bit, 192 kHz, Stereo, 9.216 Mbps


RE: 24 bit Output to HDMI downsamples to 16 bit - jcucurull - 09-24-2021

Same problem here with a Raspberry Pi 3b...

For me the solution proposed is not acceptable, because I have many 24/96 files with 5.1 channels, which cannot be output via SPDIF, but only via HDMI. So, any other solution?


RE: 24 bit Output to HDMI downsamples to 16 bit - CoppolaVH - 10-01-2021

I know what you mean, and I feel the same way, but given Moode Audio is a LINUX kernel 5.4 branch I don't think we have a way to solve this issue.  I am decidedly not the technical person, but I understand later kernels may have a way to address this, but frankly I gave up as has the github link I posted gotten no solve.