[Problem]: Audio silent after track switching by Apple Music Automix

[th0u]

What happened?

Hi,
now and then, audio gets lost when playing a playlist with auto mix active.
I need to stop restart play to get Audio back.
The issue is not directly reproducible but it happens regularly.
It happened with latest shairport-sync version and also earlier.

I have a shairport Logfile captured and I know quite well the time when it happened.
It happened between Feb 18 18:45:00 - 18:45:59. Perhaps 15 sec earlier. Unfortunately the log is too long to paste

shairportsync.log.txt.zip

Relevant log output

System Information.

HifiBerry DAC+

OS: Raspbian GNU/Linux 11 (bullseye) armv7l
Host: Raspberry Pi 3 Model B Rev 1.2
Kernel: 6.1.21-v7+
Uptime: 89 days, 8 hours, 12 mins
Packages: 855 (dpkg)
Shell: bash 5.1.4
CPU: BCM2835 (4) @ 1.200GHz
Memory: 48MiB / 922MiB

Configuration Information.

my config  
From "uname -a":
  Linux traspberry 6.1.21-v7+ #1642 SMP Mon Apr  3 17:20:52 BST 2023 armv7l GNU/Linux

 From /etc/os-release:
  Raspbian GNU/Linux 11 (bullseye)

 From /sys/firmware/devicetree/base/model:
  Raspberry Pi 3 Model B Rev 1.2

 Shairport Sync Version String:
  5.0.0-1-gc956d763-AirPlay2-smi10-OpenSSL-Avahi-ALSA-soxr-sysconfdir:/etc

 Command Line:
  shairport-sync --displayConfig

 Configuration File:
  /etc/shairport-sync.conf

 Configuration File Settings:
  general :
  {
    name = "HifiBerry Audio1";
    interpolation = "auto";
    volume_control_profile = "dasl_tapered";
  };
  sessioncontrol :
  {
    run_this_before_entering_active_state = "/xxxx.sh before_entering_active_state";
    run_this_after_exiting_active_state = "/xxxxx.sh after_exiting_active_state";
    active_state_timeout = 300.0;
    run_this_before_play_begins = "/xxxx.sh before_play_begins ";
    run_this_after_play_ends = "/xxxx.sh after_play_ends";
    session_timeout = 300;
  };
  alsa :
  {
    output_device = "hw:0";
    mixer_control_name = "Digital";
  };
  diagnostics :
  {
    log_verbosity = 3;
  };

 >> Display Config End.

PulseAudio or PipeWire installed?

• Check if your system uses a Sound Server.

How did you install Shairport Sync?

Built from source

Check previous issues

• Confirm

[mikebrady]

Thanks for the report. This seems to be like #2107. Thanks for the great log file, which we'll take a long look at.

Once again, if we could actually reproduce these situations easily, it would make all the difference.

[th0u]

BTW, when the issue happened, I used my iPhone to quickly capture screenshot just to preserve the current time of the issue.
For the issue above the time the screenshot was taken at 18:45:44. I am not really sure if I clicked the screenshot after skipping to next title or before. So the issue may very well be 10-30 sec earlier.
But next time (likely on weekend) I try to instantly click a screenshot to capture current time "hhmmss" as soon as issue happens.

[mikebrady]

BTW, when the issue happened, I used my iPhone to quickly capture screenshot just to preserve the current time of the issue. For the issue above the time the screenshot was taken at 18:45:44. I am not really sure if I clicked the screenshot after skipping to next title or before. So the issue may very well be 10-30 sec earlier. But next time (likely on weekend) I try to instantly click a screenshot to capture current time "hhmmss" as soon as issue happens.

Very useful, thanks.

[mikebrady]

Oops — closed by mistake!

[th0u]

Hi,
yesterday I was able to spot the "silence" issue 5 times. Still the same setup as above. No other services on the device which could generate disturbing load.
The iPad played the Apple Music Playlist "British Invasion" via Airplay to Shairport-sync.
Automix was disables during 1h of playing - no issue (logs available but not attached here).
At about 18:00 I turned on Automix. Each time the issue occurred, I took a screenshot on iPhone to record exact time. Between recognising the issue and creating, there can be 2-3 seconds.
Below are the times when the screenshot was taken. the Issue happened seconds before.

Feb 21 19:02:15
Feb 21 19:03:56
Feb 21 20:02:47
Feb 21 20:24:28
Feb 21 20:45:53

For each issue, there is a dedicated log file. Each contains the log entries from same minute (eg. Feb 21 19:02:* or Feb 21 20:02:*).

Also - but this may be a red herring - I spotted some 2sec gaps. Typically during music playing, there are log lines in each second. There are some instances were there are not log lines for more than 1 sec.
e.g. there are no log lines one Feb 21 20:24:27 but plenty before and after. As said, maybe red herring.

Hope it helps.
Cheers, T

i-Feb21-20_45_53-1.txt.gz

i-Feb21-20_24_28-1.txt.gz

i-Feb21-20_02_47-1.txt.gz

i-Feb21-19_03_56-1.txt.gz

i-Feb21-19_02_15-1.txt.gz

[mikebrady]

Thanks again.

[mikebrady]

So, here's a question I asked another user with a similar problem: are you asking for lossless audio? In other words, is your Apple Music Audio Quality setting set to Lossless? If so, could you turn off Lossless and see if the problem continues?

[th0u]

I just verified, the issue happened while Lossless was disabled on iPad.

[mikebrady]

There a quite a few playlists called “British Invasion”. Can you be more specific?

[th0u]

https://music.apple.com/de/playlist/british-invasion-essentials/pl.3041e43dff234643b9066a1b069e82fa?l=en-GB
also
https://music.apple.com/de/playlist/madness-essentials/pl.0d436f1910934fbc9be376c3bde03a42?l=en-GB