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DAC+ ADC Pro XRUN "overrun!!!" during recording

aaronlpeterson

March 02, 2021 01:57

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After some period of time, about 5 minutes of recording via the adc I get these errors:

####### + | 14%overrun!!! (at least 573.479 ms long)
Status:
state : XRUN
trigger_time: 3652.078278
tstamp : 0.000000
delay : 0
avail : 48000
avail_max : 48000

My command was this:

arecord -D plughw:CARD=sndrpihifiberry,DEV=0 -f S32_LE -r 96000 -c 2 -vv TEST3.wav

# cat /proc/device-tree/model
Raspberry Pi 4 Model B Rev 1.1

This is a very fresh image of pi os:

#uname -a

Linux raspberrypi 5.4.83-v7l+ #1379 SMP Mon Dec 14 13:11:54 GMT 2020 armv7l GNU/Linux

I found this:

https://community.blokas.io/t/overruns-with-arecord-at-192-khz-2-channel/575/3

However, still getting "Xruns:5" after about 5 minutes.

In his settings I modified it to 96k not 192 even.

Lastly, I haven't gotten this far and wanted to check here first because maybe recording more than 5 min just isn't possible on a pi.

https://www.alsa-project.org/main/index.php/XRUN_Debug

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3 comments

• 0
  
  HiFiBerry team March 02, 2021 05:39

  Try increasing the buffer size.

• 0
  
  aaronlpeterson March 02, 2021 06:04

  I forgot to mention even the highest buffer-size I could set caused xruns at ~5 minutes in.  Found something in the pi forums about arecord requiring an XFS partition.  Have you tested recording longer than 5 min?

  https://www.raspberrypi.org/forums/viewtopic.php?p=524305#p524305 

   

  Edited by aaronlpeterson March 02, 2021 06:05
• 0
  
  aaronlpeterson March 02, 2021 17:11

  Awesome.  I can confirm that simply recording to an attached USB formatted to XFS solved this problem.  Quick instructions in case you haven't mounted a usb flash drive to a pi and are tired of searching...

  1. Attach usb drive and make sure you have xfs tools: sudo apt-get -y install xfsprogs
  2. Find your usb drive (probably /dev/sda1?) and note UUID: lsblk -fp
  3. If your usb drive is already mounted, unmount it: sudo umount /the/mnt/path
  4. Make the filesystem: sudo mkfs.xfs -f /dev/sda1 -L "USB Audio Drive"
  5. Make a mount target dir: sudo mkdir /mnt/audio
  6. Mount it: sudo mount /dev/sda1 /mnt/audio

  To make this drive mount on startup add it to /etc/fstab. I have it mount by UUID and have the timeout reduced to 30 seconds in case it isn't attached.  sudo nano /etc/fstab and add this line at the end.  (You'll need to change your UUID and mount point to whatever you have/used.)

  UUID=5467f825-9730-4818-b6b9-272208a9ee06 /mnt/audio xfs defaults,auto,users,rw,nofail,x-systemd.device-timeout=30 0 0