More > JRiver Media Center 26 for Linux
Raspberry Pi4 8GB - does it handle multi-channel FLAC / DSF files
stevemac:
Bob and Kimota - thanks for the updates
bob:
--- Quote from: Kimota on August 18, 2020, 11:53:17 pm ---I have a Pi 4 with 4GB memory running Linux, and I can confirm that it can play back multi-channel DSF and send multi-channel 5.1 Surround PCM over HDMI. It's NOT in native DSD format over HDMI, however. The MC26 converts the bits into PCM before sending it over HDMI. I've also been able to play back DVD-Audio and Blu-ray 5.1 Surround Sound Audio I've ripped from disks ("The Yes Album" and "Fragile"). However, I have NOT tried playing back multi-channel FLAC files.
I just now was listening to these DSF files I ripped from SACD: "Life in the Fast Lane" from the Eagles ("Hotel California") and "Walk Between Raindrops" by Donald Fagen ("The Nightfly"). They have really nice instrument separation that makes the stereo versions sound flat in comparison.
A couple notes on my set up:
* The Pi 4 is hooked up to a 2TB music file disk directly via USB 3.0
* The MC26 is acting as the NAS and DLNA server so I can hook other apps (like MC26 I have running on my Mac) up to the Pi 4 server
* I use JRemote on an iPhone and iPad to control MC26
So, in my opinion, if you have a robust hardwired network, I would guess that the Pi 4 will be able to handle the decoding and playback over HDMI.
--- End quote ---
Would you mind running
/usr/lib/jriver/Media\ Center\ 26/alsacap
and posting the output here?
Mine doesn't show more than 2 channel support over HDMI.
Also the kernel version would be nice to know
cat /proc/version
Thanks.
bob:
--- Quote from: bob on August 20, 2020, 09:46:33 am ---Would you mind running
/usr/lib/jriver/Media\ Center\ 26/alsacap
and posting the output here?
Mine doesn't show more than 2 channel support over HDMI.
Also the kernel version would be nice to know
cat /proc/version
Thanks.
--- End quote ---
Oh hang on, you are still using the Dolby Output encoding, right?
Kimota:
--- Quote from: bob on August 20, 2020, 10:12:27 am ---Oh hang on, you are still using the Dolby Output encoding, right?
--- End quote ---
Yes! I'm using the Dolby Digital Surround 5.1 encoding. That was the only way I got it to work. So that makes me think that all the decoding/encoding is being done by the SW engine. It's pretty surprising to me that the Pi 4 has the horsepower to do all that!
Check out the driver option and DSP output setup I used, and let me know what you think is happening to make the multi-channel playback work (see attached images).
bob:
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?
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