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[Problem]: sync errors when JACK running != 44100 Hz #1926

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2 tasks done
lucianoiam opened this issue Oct 29, 2024 · 16 comments
Closed
2 tasks done

[Problem]: sync errors when JACK running != 44100 Hz #1926

lucianoiam opened this issue Oct 29, 2024 · 16 comments

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@lucianoiam
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What happened?

  • Make sure everything runs smoothly when JACK is set to 44.1 KHz
  • Configure JACK at 192 KHz
  • Run jack_simple_client -> test tone audible
  • Set soxr_resample_quality = "quick" and start shairport_sync
  • Play Apple Music on iPhone
  • No music, multiple sync errors instead

Notes:

  • Also tried all soxr_resample_quality values with same result
  • Tried different values (and no value / default) for audio_backend_buffer_desired_length_in_seconds and resync_threshold_in_seconds (had them tuned for the working 44k1 setup).

Possibly related to #1917 ?

Relevant log output

$ mpstat
Linux 6.1.77-v8-16k+ (raspberrypi) 	10/29/2024 	_aarch64_	(4 CPU)

09:18:30 AM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle
09:18:30 AM  all    7.19    0.00   24.28    0.22    0.00    0.25    0.00    0.00    0.00   68.07


$ shairport-sync --verbose
         0.001137408 "shairport.c:2278" Startup in AirPlay 2 mode, with features 0x405c4a00,0x1c340 on device "2c:cf:67:34:66:42".
         0.000060241 "shairport.c:2317" Version String: "4.3.4-1-g910264e5-AirPlay2-smi10-alac-OpenSSL-Avahi-ALSA-jack-soxr-sysconfdir:/etc"
         0.000006555 "shairport.c:2336" Command Line: "shairport-sync --verbose".
         0.000131537 "shairport.c:2372" Log Verbosity is 1.
         0.000067000 "audio_jack.c:209" SOXR quality quick
         0.031668185 "shairport.c:2440" disable_resend_requests is off.
         0.000043871 "shairport.c:2441" diagnostic_drop_packet_fraction is 0.000000. A value of 0.0 means no packets will be dropped deliberately.
         0.000013666 "shairport.c:2445" statistics_requester status is 0.
         0.000003871 "shairport.c:2450" rtsp listening port is 7000.
         0.000002907 "shairport.c:2451" udp base port is 6001.
         0.000003130 "shairport.c:2452" udp port range is 10.
         0.000002870 "shairport.c:2453" player name is "Luc Soundsystem".
         0.000003259 "shairport.c:2454" backend is "jack".
         0.000003149 "shairport.c:2455" run_this_before_play_begins action is "(null)".
         0.000003444 "shairport.c:2456" run_this_after_play_ends action is "(null)".
         0.000003593 "shairport.c:2457" wait-cmd status is 0.
         0.000002944 "shairport.c:2458" run_this_before_play_begins may return output is 0.
         0.000003074 "shairport.c:2459" run_this_if_an_unfixable_error_is_detected action is "(null)".
         0.000003593 "shairport.c:2461" run_this_before_entering_active_state action is  "(null)".
         0.000002796 "shairport.c:2463" run_this_after_exiting_active_state action is  "(null)".
         0.000002982 "shairport.c:2465" active_state_timeout is  10.000000 seconds.
         0.000005018 "shairport.c:2466" mdns backend "(null)".
         0.000003056 "shairport.c:2468" interpolation setting is "auto".
         0.000002981 "shairport.c:2472" interpolation soxr_delay_threshold is 30000000.
         0.000002815 "shairport.c:2473" resync time is 0.010000 seconds.
         0.000003055 "shairport.c:2474" resync recovery time is 0.100000 seconds.
         0.000003260 "shairport.c:2475" allow a session to be interrupted: 0.
         0.000002796 "shairport.c:2476" busy timeout time is 120.
         0.000002741 "shairport.c:2477" drift tolerance is 0.002000 seconds.
         0.000003129 "shairport.c:2478" password is not set.
         0.000002630 "shairport.c:2479" default airplay volume is: -24.000000.
         0.000003278 "shairport.c:2480" high threshold airplay volume is: -16.000000.
         0.000003463 "shairport.c:2482" check for higher-than-threshold volume for new play session is disabled.
         0.000003111 "shairport.c:2488" ignore_volume_control is 1.
         0.000002963 "shairport.c:2492" volume_max_db is not set
         0.000002648 "shairport.c:2493" volume range in dB (zero means use the range specified by the mixer): 0.
         0.000003444 "shairport.c:2495" volume_range_combined_hardware_priority (1 means hardware mixer attenuation is used first) is 0.
         0.000003482 "shairport.c:2499" playback_mode is 0 (0-stereo, 1-mono, 1-reverse_stereo, 2-both_left, 3-both_right).
         0.000003685 "shairport.c:2501" disable_synchronization is 0.
         0.000002796 "shairport.c:2502" use_mmap_if_available is 1.
         0.000002778 "shairport.c:2503" output_format automatic selection is enabled.
         0.000002926 "shairport.c:2507" output_rate automatic selection is enabled.
         0.000003111 "shairport.c:2511" audio backend desired buffer length is 0.050000 seconds.
         0.000003593 "shairport.c:2513" audio_backend_buffer_interpolation_threshold_in_seconds is 0.250000 seconds.
         0.000003500 "shairport.c:2515" audio backend latency offset is 0.000000 seconds.
         0.000003389 "shairport.c:2517" audio backend silence lead-in time is "auto".
         0.000002685 "shairport.c:2521" zeroconf regtype is "_raop._tcp".
         0.000002981 "shairport.c:2522" decoders_supported field is 3.
         0.000002834 "shairport.c:2523" use_apple_decoder is 1.
         0.000002092 "shairport.c:2524" alsa_use_hardware_mute is 0.
         0.000002704 "shairport.c:2528" no special mdns service interface was requested.
         0.000018759 "shairport.c:2531" configuration file name "/etc/shairport-sync.conf" resolves to "/etc/shairport-sync.conf".
         0.000003815 "shairport.c:2561" loudness is 0.
         0.000005667 "shairport.c:2562" loudness reference level is -20.000000
         0.000691833 "shairport.c:2689" NQPTP is online.
         0.000628352 "audio_jack.c:173" Average maximum JACK latency across all ports: 0
         0.000980648 "audio_jack.c:173" Average maximum JACK latency across all ports: 0
         1.498147221 "shairport.c:255" "soxr" interpolation has been chosen.
         4.616326479 "rtsp.c:2896" Connection 1: AP2 PTP connection from 2a02:2455:856e:7500:71fd:4b58:1561:2c75:62798 ("iPhone von Luciano") to self at 2a02:2455:856e:7500::fc39:7000.
         0.637322537 "rtsp.c:3253" Connection 1: SETUP AP2 no Active-Remote information  the SETUP Record.
         0.000038685 "rtsp.c:3272" Connection 1: SETUP AP2 doesn't include DACP-ID string information.
         0.423285426 "rtp.c:2490" Flush completed while play_enabled is true.
         0.797727370 "player.c:2903" Large negative (i.e. early) sync error of -1069 frames (-0.024240 seconds), at frame: 1394452527.
         0.080969888 "player.c:2878" Large positive (i.e. late) sync error of 5481 frames (0.124286 seconds), at frame: 1394457103.
         0.342527111 "player.c:2903" Large negative (i.e. early) sync error of -1050 frames (-0.023810 seconds), at frame: 1394471183.
         0.080981130 "player.c:2878" Large positive (i.e. late) sync error of 5420 frames (0.122902 seconds), at frame: 1394475759.
         0.362421074 "player.c:2903" Large negative (i.e. early) sync error of -854 frames (-0.019365 seconds), at frame: 1394490543.
         0.080947259 "player.c:2878" Large positive (i.e. late) sync error of 4759 frames (0.107914 seconds), at frame: 1394495119.
         0.342375315 "player.c:2903" Large negative (i.e. early) sync error of -843 frames (-0.019116 seconds), at frame: 1394509199.
         0.141553148 "player.c:2878" Large positive (i.e. late) sync error of 4013 frames (0.090998 seconds), at frame: 1394516239.
         0.322116407 "player.c:2903" Large negative (i.e. early) sync error of -811 frames (-0.018390 seconds), at frame: 1394529615.
         0.141401203 "player.c:2878" Large positive (i.e. late) sync error of 3961 frames (0.089819 seconds), at frame: 1394536655.
         0.270179445 "player.c:2878" Large positive (i.e. late) sync error of 3204 frames (0.072653 seconds), at frame: 1394548975.
         0.314145833 "player.c:2903" Large negative (i.e. early) sync error of -838 frames (-0.019002 seconds), at frame: 1394561647.
         0.081008685 "player.c:2878" Large positive (i.e. late) sync error of 4708 frames (0.106757 seconds), at frame: 1394566223.
         0.322123092 "player.c:2903" Large negative (i.e. early) sync error of -1013 frames (-0.022971 seconds), at frame: 1394579599.
         0.080988723 "player.c:2878" Large positive (i.e. late) sync error of 5233 frames (0.118662 seconds), at frame: 1394584175.
         0.362462796 "player.c:2903" Large negative (i.e. early) sync error of -816 frames (-0.018503 seconds), at frame: 1394598959.
         0.080871926 "player.c:2878" Large positive (i.e. late) sync error of 4629 frames (0.104966 seconds), at frame: 1394603535.
         0.310784536 "player.c:2878" Large positive (i.e. late) sync error of 2339 frames (0.053039 seconds), at frame: 1394617615.
         0.261996945 "player.c:2903" Large negative (i.e. early) sync error of -1560 frames (-0.035374 seconds), at frame: 1394628527.
         0.113189833 "player.c:2878" Large positive (i.e. late) sync error of 5257 frames (0.119206 seconds), at frame: 1394633103.
         0.351506833 "player.c:2903" Large negative (i.e. early) sync error of -1484 frames (-0.033651 seconds), at frame: 1394648943.
         0.093019667 "player.c:2878" Large positive (i.e. late) sync error of 5651 frames (0.128141 seconds), at frame: 1394653519.
         0.463876296 "player.c:2903" Large negative (i.e. early) sync error of -860 frames (-0.019501 seconds), at frame: 1394672879.
         0.081085518 "player.c:2878" Large positive (i.e. late) sync error of 4781 frames (0.108413 seconds), at frame: 1394677455.
         0.330532778 "player.c:2903" Large negative (i.e. early) sync error of -1366 frames (-0.030975 seconds), at frame: 1394691535.
         0.101002074 "player.c:2878" Large positive (i.e. late) sync error of 1755 frames (0.039796 seconds), at frame: 1394696111.
         0.233837444 "player.c:2878" Large positive (i.e. late) sync error of 616 frames (0.013968 seconds), at frame: 1394706319.
         0.189858037 "player.c:2878" Large positive (i.e. late) sync error of 2222 frames (0.050385 seconds), at frame: 1394715471.
         0.274161037 "player.c:2903" Large negative (i.e. early) sync error of -983 frames (-0.022290 seconds), at frame: 1394726383.
         0.080937444 "player.c:2878" Large positive (i.e. late) sync error of 5186 frames (0.117596 seconds), at frame: 1394730959.
         0.330517870 "player.c:2878" Large positive (i.e. late) sync error of 2332 frames (0.052880 seconds), at frame: 1394745743.
         0.273923797 "player.c:2903" Large negative (i.e. early) sync error of -1032 frames (-0.023401 seconds), at frame: 1394756655.
         0.081006722 "player.c:2878" Large positive (i.e. late) sync error of 5355 frames (0.121429 seconds), at frame: 1394761231.
         0.362650518 "player.c:2903" Large negative (i.e. early) sync error of -829 frames (-0.018798 seconds), at frame: 1394776015.
         0.080836463 "player.c:2878" Large positive (i.e. late) sync error of 4670 frames (0.105896 seconds), at frame: 1394780591.
         0.322953926 "player.c:2903" Large negative (i.e. early) sync error of -972 frames (-0.022041 seconds), at frame: 1394793967.
         0.080887277 "player.c:2878" Large positive (i.e. late) sync error of 5212 frames (0.118186 seconds), at frame: 1394798543.
         0.362846982 "player.c:2903" Large negative (i.e. early) sync error of -1116 frames (-0.025306 seconds), at frame: 1394813679.
         0.080905240 "player.c:2878" Large positive (i.e. late) sync error of 5633 frames (0.127732 seconds), at frame: 1394818255.
         0.362657908 "player.c:2903" Large negative (i.e. early) sync error of -915 frames (-0.020748 seconds), at frame: 1394833039.
         0.080751814 "player.c:2878" Large positive (i.e. late) sync error of 4951 frames (0.112268 seconds), at frame: 1394837615.
         0.310123833 "player.c:2903" Large negative (i.e. early) sync error of -1629 frames (-0.036939 seconds), at frame: 1394850991.
         0.112942889 "player.c:2878" Large positive (i.e. late) sync error of 6032 frames (0.136780 seconds), at frame: 1394855567.
         0.362979185 "player.c:2903" Large negative (i.e. early) sync error of -1058 frames (-0.023991 seconds), at frame: 1394871407.
         0.081278352 "player.c:2878" Large positive (i.e. late) sync error of 5389 frames (0.122200 seconds), at frame: 1394875983.
         0.362821778 "player.c:2903" Large negative (i.e. early) sync error of -835 frames (-0.018934 seconds), at frame: 1394890767.
         0.080952314 "player.c:2878" Large positive (i.e. late) sync error of 4694 frames (0.106440 seconds), at frame: 1394895343.
         0.431471241 "player.c:2903" Large negative (i.e. early) sync error of -1470 frames (-0.033333 seconds), at frame: 1394913999.
         0.113032648 "player.c:2903" Large negative (i.e. early) sync error of -1062 frames (-0.024082 seconds), at frame: 1394918575.
         0.089110537 "player.c:2878" Large positive (i.e. late) sync error of 7894 frames (0.179002 seconds), at frame: 1394923151.
         0.362556407 "player.c:2878" Large positive (i.e. late) sync error of 2530 frames (0.057370 seconds), at frame: 1394939343.
         0.253669167 "player.c:2878" Large positive (i.e. late) sync error of 2668 frames (0.060499 seconds), at frame: 1394950255.
         0.282345129 "player.c:2903" Large negative (i.e. early) sync error of -804 frames (-0.018231 seconds), at frame: 1394961871.
         0.080835963 "player.c:2878" Large positive (i.e. late) sync error of 4583 frames (0.103923 seconds), at frame: 1394966447.
         0.310830241 "player.c:2878" Large positive (i.e. late) sync error of 1572 frames (0.035646 seconds), at frame: 1394980527.
         0.233830777 "player.c:2878" Large positive (i.e. late) sync error of 2579 frames (0.058481 seconds), at frame: 1394990383.
         0.282110963 "player.c:2903" Large negative (i.e. early) sync error of -904 frames (-0.020499 seconds), at frame: 1395001999.
         0.080725074 "player.c:2878" Large positive (i.e. late) sync error of 4913 frames (0.111406 seconds), at frame: 1395006575.
         0.302077685 "player.c:2878" Large positive (i.e. late) sync error of 3099 frames (0.070272 seconds), at frame: 1395019951.
         0.290369204 "player.c:2878" Large positive (i.e. late) sync error of 2317 frames (0.052540 seconds), at frame: 1395032975.
         0.274066407 "player.c:2903" Large negative (i.e. early) sync error of -1020 frames (-0.023129 seconds), at frame: 1395043887.
         0.081077241 "player.c:2878" Large positive (i.e. late) sync error of 5316 frames (0.120544 seconds), at frame: 1395048463.
         0.331058722 "player.c:2878" Large positive (i.e. late) sync error of 3805 frames (0.086281 seconds), at frame: 1395063247.
         0.303367648 "player.c:2878" Large positive (i.e. late) sync error of 3456 frames (0.078367 seconds), at frame: 1395076623.
         0.423779684 "player.c:2903" Large negative (i.e. early) sync error of -1466 frames (-0.033243 seconds), at frame: 1395094575.
         0.093197611 "player.c:2878" Large positive (i.e. late) sync error of 5524 frames (0.125261 seconds), at frame: 1395099151.
         0.342409111 "player.c:2903" Large negative (i.e. early) sync error of -912 frames (-0.020680 seconds), at frame: 1395113231.
         0.080806074 "player.c:2878" Large positive (i.e. late) sync error of 4945 frames (0.112132 seconds), at frame: 1395117807.
         0.322490222 "player.c:2903" Large negative (i.e. early) sync error of -1076 frames (-0.024399 seconds), at frame: 1395131183.
         0.080851834 "player.c:2878" Large positive (i.e. late) sync error of 6656 frames (0.150930 seconds), at frame: 1395135759.
         0.382783962 "player.c:2903" Large negative (i.e. early) sync error of -1047 frames (-0.023741 seconds), at frame: 1395151599.
         0.080890852 "player.c:2878" Large positive (i.e. late) sync error of 5401 frames (0.122472 seconds), at frame: 1395156175.
         0.362574741 "player.c:2903" Large negative (i.e. early) sync error of -851 frames (-0.019297 seconds), at frame: 1395170959.
         0.081037092 "player.c:2878" Large positive (i.e. late) sync error of 4750 frames (0.107710 seconds), at frame: 1395175535.
         0.322250278 "player.c:2903" Large negative (i.e. early) sync error of -1017 frames (-0.023061 seconds), at frame: 1395188911.
         0.080843444 "player.c:2878" Large positive (i.e. late) sync error of 5299 frames (0.120159 seconds), at frame: 1395193487.
         0.362216333 "player.c:2903" Large negative (i.e. early) sync error of -838 frames (-0.019002 seconds), at frame: 1395208271.
         0.080913130 "player.c:2878" Large positive (i.e. late) sync error of 4701 frames (0.106599 seconds), at frame: 1395212847.

System Information.

Linux raspberrypi 6.1.77-v8-16k+ #1730 SMP PREEMPT Thu Feb  8 15:30:42 GMT 2024 aarch64 GNU/Linux

Model		: Raspberry Pi 5 Model B Rev 1.0
Revision	: d04170

card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ Pro HiFi pcm512x-hifi-0 [HiFiBerry DAC+ Pro HiFi pcm512x-hifi-0]

Configuration Information.

$ shairport-sync --displayConfig 
>> Display Config Start.

From "uname -a":
 Linux raspberrypi 6.1.77-v8-16k+ #1730 SMP PREEMPT Thu Feb  8 15:30:42 GMT 2024 aarch64 GNU/Linux

From /etc/os-release:
 Debian GNU/Linux 12 (bookworm)

From /sys/firmware/devicetree/base/model:
 Raspberry Pi 5 Model B Rev 1.0

Shairport Sync Version String:
 4.3.4-1-g910264e5-AirPlay2-smi10-alac-OpenSSL-Avahi-ALSA-jack-soxr-sysconfdir:/etc

Command Line:
 shairport-sync --displayConfig

Configuration File:
 /etc/shairport-sync.conf

Configuration File Settings:
 general : 
 {
   name = "Luc Soundsystem";
   output_backend = "jack";
   audio_backend_buffer_desired_length_in_seconds = 0.05;
   resync_threshold_in_seconds = 0.01;
   volume_control_profile = "dasl_tapered";
   ignore_volume_control = "yes";
 };
 pw : 
 {
 };
 jack : 
 {
   soxr_resample_quality = "quick";
 };

>> Display Config End.
>> Goodbye!

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
@lucianoiam
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Also tried various buffer sizes for the JACK server, from 16 (works for 44k1) up to 512.

@mikebrady
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Owner

Thanks for the post. Not sure what might be happening here -- maybe some jack users could chime in.

It's probably worth checking how busy the computer gets -- something like htop, to see if any of the CPUs are being maxed out.

@lucianoiam
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Here's a 8s sample of CPU usage

Screen.Recording.2024-10-31.at.07.39.41.mov

@mikebrady
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Thanks. Am I right in thinking that this system is also running PulseAudio?

@lucianoiam
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That's correct. PulseAudio has its output configured to JACK instead of ALSA. The "owner" of the sound device on the Pi is JACK. PulseAudio is there for serving Bluetooth clients only.

$ jack_lsp
system:playback_1
system:playback_2
PulseAudio JACK Sink:front-left
PulseAudio JACK Sink:front-right
PulseAudio JACK Source:front-left
PulseAudio JACK Source:front-right
shairport-sync:out_L
shairport-sync:out_R
librespot:out_0
librespot:out_1
a2j:Midi Through (capture): Midi Through Port-0
a2j:Midi Through (playback): Midi Through Port-0

@mikebrady
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Thanks. Does Shairport Sync work if jack is set to 88,200 or 48,000?

@lucianoiam
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Just double checked, no audio for both sample rates. The buffer size was 256. jack_simple_client plays an audible tone in both cases.

The log shows the same sync errors, however at a much slower rate compared to 192Khz.

So the higher the sample rate is (> 44100), the more frequent the sync errors show up in the log.

@mikebrady
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Thanks -- that might be useful!

@mikebrady
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mikebrady commented Oct 31, 2024

So, I think I may have found an error: the latency was being reported back to Shairport Sync in terms of the number of frames at the Jack Audio server's rate (e.g. 192k) rather than Shairport Sync's own rate (i.e. 44.1k).

I think I've fixed this and pushed an update into the development branch.
Unfortunately, I can't easily test it, as I do not run Jack Audio normally.

Consequently, I'd be grateful if you would try it out and report back...

@lucianoiam
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Thanks, just tried b221e13. Still no audio, but now only two sync errors pop up immediately upon playing play on the sender, no matter what's the sample rate. Then log is clean. Looks like an improvement.

48000

         0.893320147 "player.c:2883" Large positive (i.e. late) sync error of 1372 frames (0.031111 seconds), at frame: 269780839.
         0.229316834 "player.c:2908" Large negative (i.e. early) sync error of -1249 frames (-0.028322 seconds), at frame: 269790695.

88200

         1.416964666 "player.c:2883" Large positive (i.e. late) sync error of 1070 frames (0.024263 seconds), at frame: 1552577949.
         0.213334666 "player.c:2908" Large negative (i.e. early) sync error of -1006 frames (-0.022812 seconds), at frame: 1552587453.

192000

         1.085103129 "player.c:2883" Large positive (i.e. late) sync error of 1068 frames (0.024218 seconds), at frame: 507018661.
         0.221539296 "player.c:2908" Large negative (i.e. early) sync error of -1370 frames (-0.031066 seconds), at frame: 507028165.

@lucianoiam
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Wait... it works! but I had to reboot the Pi before trying 192000, weird.

So far I've been restarting JACK, recompiling shairport-sync, starting with --verbose and stopping with Ctrl+C. Then repeating the cycle.

@lucianoiam
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I repeated the test with master branch and a reboot in the middle to double check, and audio is broken. So yes this definitely fixes the problem.

Wondering what the reboot is doing... JACK is started via D-Bus so there might be something there.

SoX resampling quality is set to very high and the Pi still shows < 10% CPU load. Awesome.

Thanks a lot!

@mikebrady
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Yikes, that's all a bit weird, but it's good to see that it's working. I'm not any kind of expert on Jack Audio, I'm afraid, so I don't know if a D-Bus restart is completely "clean".

Is it too soon to declare victory, I wonder? 🙂

@lucianoiam
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Oops... just realized the test cycle was flawed, shaiport-sync doesn't automatically connect to the JACK output ports on startup, that has to be done manually. That is achieved on the Pi by a startup script -- explains why the reboot. So the observations about output being silent were wrong. When there are multiple sync errors, audio stutters but it is not silent.

Auto connection of ports would be a nice addition, some JACK apps do it.

The lonely sync errors three comments ago were caused by resync_threshold_in_seconds being too low for 192KHz. Also fixed.

So now everything is under control, I will test this more (aka listen to music for an extended period) and report back. Thanks.

@lucianoiam
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Flawless, this issue report can be closed.

@mikebrady
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Great -- thanks for improving Shairport Sync!

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