No sound output via AirPlay

Posts: 2
Joined: Sun Mar 05, 2017 1:56 pm

No sound output via AirPlay

Sun Mar 05, 2017 2:30 pm

I've got a Vocore2 + audio dock via IGG.

I've already updated it to Firmware (2016.12.24) (md5:2a6b06ee7ec7b3fa6fd3e9eeb5c83531).
Code: Select all
# uname -a
Linux OpenWrt 3.18.29 #32 Sat Dec 24 22:01:05 CST 2016 mips GNU/Linux

When I copy an MP3 to the VoCore2 via SSH I can play it with madplay file.mp3 and I can hear the sound on my stereo. So I know my audio wiring is working correctly.

When connecting my laptop to the VoCore2 SSID I can select it as an AirPlay target in iTunes and start playing music. I can see the network connections to to the VoCore2.

On the VoCore2 I can see the system load rise from about 4% to around 15% which tells me that audio data is being decoded. Load immedeately drops when I pause music playback.

The problem is that I cannot hear the music when playing via AirPlay.

I've tried setting up audio via alsamixer which tells me there is nothing to configure, the 0 mt7628-audio-card is recognised. I can also see the device being selected.

Code: Select all
root@OpenWrt:/tmp# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: mt7628audiocard [mt7628-audio-card], device 0: audio-card es8388-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
root@OpenWrt:/tmp# aplay -L
    Discard all samples (playback) or generate zero samples (capture)
    Default Audio Device
    Default Audio Device

I've also tried setting the audio card as output device in /etc/shairport-sync.conf which did not make any difference. (The setting does stick after a reboot but doesn't seem to remedy the problem.)

Even though it seems I'm also suffering from the PCB airport antenna interference causing a crackling in the audio output. But I can probably solve that with an external antenna. My main problem is that AirPlay doesn't output sound at all.

What else could I try to get AirPlay to output sound?

Posts: 720
Joined: Sun Oct 19, 2014 6:00 am

Re: No sound output via AirPlay

Wed Mar 08, 2017 2:41 pm

This is really weird.
Please check shairport config.
If audio output is normal, wireless transfer is normal, the only problem is shairport setting is wrong.

PS: But default setting works on every vocore as we tested. :)

Posts: 2
Joined: Sun Mar 05, 2017 1:56 pm

Re: No sound output via AirPlay

Sat Mar 18, 2017 8:43 pm

Thanks, that was what I was expecting. For some reason it did not work.

I got it fixed by reflashing the current firmware two more times. Now AirPlay is working. :)

I also do get the crackling and occasional break ups of the audio, like already mentioned in another thread. Touching the onboard antenna does help sometimes but not always.

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