[mythtv-users] mythfrontend on host segfaults when kvm guest plays sound
Eyal Lebedinsky
eyal at eyal.emu.id.au
Mon Jul 12 00:24:06 UTC 2021
[Changed subject to better describe the problem]
Also, what is the recommended mythtv audio (on host) setup these days?
vlc, for example, uses Audio Device "Built-in Audio Digital Stereo [HDMI 3]".
$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC887-VD Digital [ALC887-VD Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 10: HDMI 4 [HDMI 4]
Subdevices: 1/1
Subdevice #0: subdevice #0
TIA
On 11/07/2021 20.40, Eyal Lebedinsky wrote:
> Thunderbird is running in a kvm/libvirt guest.
> mythfrontend runs on the host.
> Both are up-to-date f34.
>
> When mail arrives (at the guest) it pings, and mythfrontend (on the host) segfaults.
> This is consistent.
>
> later: even vlc playing in the guest crashes mythfrontend . vlc on the host is fine.
> So this is a general audio issue.
>
> If it matters: mythfrontend setup "Audio Device" is "JACK:". Other devices have issues:
> PulseAudio:default has volume control sync a bit off
> ALSA:default no volume control sync good
> ALSA:pipewire no volume control sync good
> ALSA:sysdefault:CARD=PCH no sound
> ALSA:iec958:CARD=PCH,DEV=0 no sound
> ALSA:hdmi:CARD=PCH,DEV=0 no sound
> ALSA:hdmi:CARD=PCH,DEV=3 no sound
> JACK have volume control sync good
>
> "has volume control" means vol up/down/mute works.
> Sound is through HDMI to the screen.
>
> ALSA:default does not crash
> ALSA:pipewire does not crash
>
> Looks like interaction with JACK so am now using ALSA:default.
--
Eyal Lebedinsky (eyal at eyal.emu.id.au)
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