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Audio dropouts on Raspberry Pi 3

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beard:
I recently upgraded my master license from MC21 to MC24, and just performed a clean upgrade/install on my Raspberry Pi 3 model B (2016) following Awesome Donkey's stickied post (completely removed the MC21 installation). I should note that aside from periodic crashes to desktop on the Pi, MC21 was performing perfectly and completely filled my needs. Unfortunately, I am now getting 2 to 3 audio dropouts per track -- very brief, millisecond drops. 

Here's my setup:

- RPi 3 Model B running Raspian Jessie, up to date
- Phantom YoYo PCM2704 USB DAC using S/PDIF to audio receiver (hw:card=DAC,DEV=0 [ALSA])
- Windows 10 MC24 running as a dumb client for remote control (but please note this issue occurs whether or not the Windows client is running)
- Mixed library of MP3 and FLAC running from a powered external USB drive

As I mentioned, I never had this problem with MC21 running the same setup. I have tried various suggestions from searching the forum, such as increasing buffering in Options > Audio > Device settings, and increasing pre-buffering in Options > Audio > Prebuffering. I found no other relevant suggestions for my setup (most suggestions are for Windows or Mac systems).

I'd really rather not revert back to MC21, but the daily crash to desktop was much less bothersome than the audio dropouts.

Thanks in advance for the support. Please let me know if more information is required to debug.

Awesome Donkey:
It might be a long shot, but you could see if setting up thread priorities helps any.

https://yabb.jriver.com/interact/index.php/topic,115349.msg797319.html#msg797319

beard:
Thank you for the swift reply. I successfully set up thread priorities, but the issue remains. That said, it does seem to have slightly reduced the frequency of dropouts -- from 2 to 3 per track, down to 1 or 2.

bob:

--- Quote from: beard on May 11, 2018, 03:41:36 pm ---Thank you for the swift reply. I successfully set up thread priorities, but the issue remains. That said, it does seem to have slightly reduced the frequency of dropouts -- from 2 to 3 per track, down to 1 or 2.

--- End quote ---
It might be because of background thumbnailing.
Set that option to Low priority for the Pi and see if that helps.
Also, check to make sure you are using a hardware device in the audio settings. You can also tinker with the buffer settings under the audio device specific settings.

erviv:
I had similar problems on MC23. However once I upgraded my rpi to stretch from Jessie the audio dropouts disappeared. I have since also upgraded to MC  24 and continue to have clean performance.

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