More > JRiver Media Center 26 for Linux
Raspberry Pi4 8GB - does it handle multi-channel FLAC / DSF files
Kimota:
--- Quote from: bob on August 20, 2020, 11:20:19 am ---You should be able to use the hw: audio output device 2 lines above the one you are using (no conversions) since you are encoding everything to 48k dolby digital anyway but it likely doesn't matter since the plughw one shouldn't be doing any conversions in this case.
I'm using a similar setup to you in the one case where I have to output multichannel out a Optical port and it works fine. I'm doing it on an Intel NUC though (an Id). I've not tried in on a Pi.
What's your cpu load on the Pi when it's doing the conversion to Dolby from the multichannel DSF files?
--- End quote ---
Thanks for the feedback, Bob!
I tried the HW audio device you suggested, but it doesn't give me any playback. It just sits there when I hit the "play" button.
The load on the CPU during playback is around 20% using 355MB of memory out of 4GB decoding a DSF 6-channel file and converting to 5.1 Dolby Digital Surround Sound PCM. See the attached screenshot.
bob:
--- Quote from: Kimota on August 20, 2020, 12:53:19 pm ---Thanks for the feedback, Bob!
I tried the HW audio device you suggested, but it doesn't give me any playback. It just sits there when I hit the "play" button.
The load on the CPU during playback is around 20% using 355MB of memory out of 4GB decoding a DSF 6-channel file and converting to 5.1 Dolby Digital Surround Sound PCM. See the attached screenshot.
--- End quote ---
Thanks for the reply,
I'm going to try that setup here... I'm really interested why the hw: device didn't work.
stevemac:
performed an adhoc search for kernel updates for the Pi and the ability for it to handle multi-channel via HDMI and looks like it may have been addressed on the Model 3B & perhaps the Model 4
Posts from DIYaudio on multichannel via HDMI
* https://www.diyaudio.com/forums/pc-based/334443-2-8-dsp-platform-using-raspberry-pi-hats-post6390068.html
* https://www.diyaudio.com/forums/pc-based/334443-2-8-dsp-platform-using-raspberry-pi-hats-post6390271.html
& from github
* https://github.com/raspberrypi/linux/pull/3933
Will pull out my old model 3B, update it and report back. Have purchased a Model 4. Will work out how to update the kernel to raspberrypi:rpi-5.9.y and test there too.
Given my lack of skill in this area - it'd be great if others would also review
thanks,
Steve
stevemac:
Found the model 3B. updated it, updated the kernel to Linux raspberrypi 5.10.14-v7+
It is able to do multichannel audio over HDMI - 16bit 48000hz.
* some crackling on rear channels.
* think channel mapping is wrong
updated .asoundrc with entry to correct channel mapping. Test file is now OK, but cannot play MC to that device
Will upgrade PI to MC 27, test and post on the v27 board. Have not started testing with the model 4 yet
regards,
Steve
bob:
--- Quote from: stevemac on February 14, 2021, 08:21:53 pm ---Found the model 3B. updated it, updated the kernel to Linux raspberrypi 5.10.14-v7+
It is able to do multichannel audio over HDMI - 16bit 48000hz.
* some crackling on rear channels.
* think channel mapping is wrong
updated .asoundrc with entry to correct channel mapping. Test file is now OK, but cannot play MC to that device
Will upgrade PI to MC 27, test and post on the v27 board. Have not started testing with the model 4 yet
regards,
Steve
--- End quote ---
Can't play to the hdmi: device??
Run /usr/lib/jriver/Media\ Center\ 27/alsacap and post the results here please.
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