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stefano_mbp · 28-10-2021, 12:10

… surely the raspberry is underpowered for HQPe, it is definitely better configured as NAA (endpoint for HQP/HQPe) and all the chain “rings” should be on a 1Gb/s LAN.

simoncn · 28-10-2021, 12:37

As HQPlayer Embedded supports Raspberry Pi 4, it is not unreasonable to expect it to work when running on this device. My RPi4 is wired to the switch using a 1 GB/s connection.

stefano_mbp · 28-10-2021, 13:43

(28-10-2021 12:37)simoncn Wrote: As HQPlayer Embedded supports Raspberry Pi 4, it is not unreasonable to expect it to work when running on this device. My RPi4 is wired to the switch using a 1 GB/s connection.

… of course, but with some constraint. It should work upsampling PCM to PCM, PCM to DSD is a very demanding task.
Just to get rid of curiosity try to upsample 16/44.1 to 24/176.4, if it works try then to upsample to 352.8

simoncn · 28-10-2021, 13:56

My tests were performed using 16/44.1 audio with no upsampling or transcoding. If gapless playback doesn't work in this situation, this is a significant issue.

stefano_mbp · 28-10-2021, 14:16

… I never tried with raspberries, in the next weekend I’ll try … I have two rpi4 … and report back to you

simoncn · 28-10-2021, 14:40

Thanks very much! I am using the default on-board audio. To make this work, it is necessary to change the PCM rate limit value to 48000.

stefano_mbp · 31-10-2021, 05:54

Hi Simon, I tried with two rpi4s, one with HQPe and the other with RoPieee XL as NAA connected to a usb dac.
As you experimented, the gap between the tracks is still there.
Then I switched NAA / rpi4 to an sMS200 Neo SOtM and everything works as expected with upsampling up to 24/192 without any gap.
I checked the NAA version but it is the same for both SOtM sMS200 and RoPieee XL and they are connected to the same network switch ... I can't understand this different behavior because the same NAA / rpi4 works correctly with HQPe installed on an Intel Nuc.
I will try to investigate deeper this issue and let you know

simoncn · 31-10-2021, 19:00

Thanks for the update. I didn't use a NAA for my tests, just the built-in RPi audio. Presumably this means the NAA (or equivalent software) for my tests is an internal component of HQPlayer Embedded.

stefano_mbp · 01-11-2021, 10:57

I didn’t realized you weren’t using a NAA, I’ll try and let you know.
If you use HPlayer OS (the bootable image) it includes the NAA sw.
You can turn HQPlayer OS into NAA-only by disabling HQPlayer Embedded - login as "root" without password:
systemctl disable hqplayerd ; systemctl stop hqplayerd

simoncn · 01-11-2021, 11:57

I am using the bootable image with embedded NAA. This is simpler for me to set up as a test environment.