[kde] [Bug 455092] New: Surround 5.1 channels are mixed/mapped-up incorrectly using pulseaudio
Frank Haferkorn
bugzilla_noreply at kde.org
Thu Jun 9 17:42:14 BST 2022
https://bugs.kde.org/show_bug.cgi?id=455092
Bug ID: 455092
Summary: Surround 5.1 channels are mixed/mapped-up incorrectly
using pulseaudio
Product: kde
Version: unspecified
Platform: Debian stable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: unassigned-bugs at kde.org
Reporter: OGIS.eu at gmail.com
Target Milestone: ---
SUMMARY
***
Surround 5.1 channels are mixed/mapped-up incorrectly using pulseaudio
This can be fixed by a unusual tweak of the channel-mapping.....
This is related to interfacing pulseaudio via surround 5.1
***
This is a duplicate of: https://forum.kde.org/viewtopic.php?f=305&t=175181
STEPS TO REPRODUCE
1. to get 6 channel audio output it is necessary to modify file
"/etc/pulse/daemon.conf" by adding 6 channel-map;
default-channel-map =
front-left,front-right,rear-left,rear-right,front-center,lfe
2.) to beware of recall of last restored card or device info best un-comment
all "load-module module-*restore*"
lines in pulseaudio file /etc/pulse/ default.pa
HINT: the channel-counts MUST NOT be set explicitly,
;;;; default-channels = 6
is default-channels are set, the resulting channel-map is completely weird
Possible PROBLEM:
are the correct channels chosen when pressing KDE->SystemSetting->
Audio->Extended->Speaker-Test ?
OBSERVED RESULT
Neither a check of speaker-channel mapping shows the correct channels usage
of surround 5.1
speaker-test -c6
nor
KDE->Systemsettings->AUDIO->tab:Extensions->Control Speaker Set
EXPECTED RESULT
both of the two tests shown above should work correct.
SOFTWARE/OS VERSIONS the used platform is a raspberry PI-400
Windows:
macOS:
Linux/KDE Plasma: Linux kderaspi 5.15.32-v8+ #1538 SMP PREEMPT Thu Mar 31
19:40:39 BST 2022 aarch64 GNU/Linux
KDE Plasma Version: 5.20.5
KDE-Framework-Version: 5.78.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION; WORKAROUND
I found a workaround to get correct audio channels by tweaking the
channel-mappings.
by tweaking the default settings:
front-left,front-right,rear-left,rear-right,front-center,lfe
to
front-left,front-right,lfe,front-center,rear-left,rear-right
in pulsasudio daemon config configuration and alsa-mixer/profile-sets
#### details of workaround.... the position and ordering of
"...,lfe,front-center,..." is eminent.
#FIX-part1: modifying /etc/pulse/daemon.conf by adding 6 channel-map values AND
using "lfe,front-center" in this sequence
; default-channels = 6 // channel-count MUST NOT be set, otherwise resulting
channel-map is completely weird
default-channel-map =
front-left,front-right,lfe,front-center,rear-left,rear-right
#FIX-part2: vi /usr/share/pulseaudio/alsa-mixer/profile-sets/default.conf
[Mapping hdmi-surround]
description = Digital Surround 5.1 (HDMI 0)
device-strings = hdmi:%f
paths-output = hdmi-output-0
channel-map = front-left,front-right,lfe,front-center,rear-left,rear-right
priority = 8
direction = output
--
You are receiving this mail because:
You are the assignee for the bug.
More information about the Unassigned-bugs
mailing list