I checked out your suggestion of "System Settings > Sound > Applications
and verify (while running) that the problematic applications aren't muted or
have different volume": check was Ok. I'll try the reverting to previous
pulseaudio suggestion later. I have a question. This PC doesn't play an mp3
file audibly either with usb speakers or with hdmi to a monitor containing
speakers. However, Sound Settings plays sound Ok when doing test of it. Also,
on another Ubuntu 16.04 computer (same make & model), with sound played through
speakers connected by jack plug to headphones/speaker output socket, mp3 files
played Ok with vlc. Is there a way of testing that pulseaudio is being used by
an app and/or the method of connecting speakers (i.e. usb, hdmi, jack plug)?
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Touch seeded packages, which is subscribed to pulseaudio in Ubuntu.
No audio on vlc or videos sound or video files
Status in pulseaudio package in Ubuntu:
Up until a few weeks ago there was no problem with playing sound from mp3
files. I have a pair of usb speakers. Audio plays Ok on them for video clips
using Chrome (e.g. from BBC website). Using vlc 2.2.2 (from Ubuntu repos),
neither a CD nor DVD (video is Ok) nor mp3 file plays audio. mp3 files play Ok
using Rhythmbox. I've also tried vlc 3.0 with no success.
Interestingly, the standard Videos app (Totem?) also doesn't play sound on
these speakers either of an mp4 file (downloaded from YouTube, though it plays
Ok on YouTube website using Chrome) or a DVD. Clemenetine plays mp3 files Ok. I
first reported this as bug 1752267 as I thought that the problem was with vlc.
On that bug, it was suggested that the problem is with Pulseaudio.
Just now, I've tried to play sound through my monitor's built in speakers
connected by hdmi (though the monitor displays Ok) with no success even though
the built-in speakers play sound using pavucontrol when testing is invoked.
DistroRelease: Ubuntu 16.04
Package: pulseaudio 1:8.0-0ubuntu3.8
ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
Uname: Linux 4.4.0-116-generic x86_64
USER PID ACCESS COMMAND
/dev/snd/controlC2: john 2410 F.... pulseaudio
/dev/snd/controlC0: john 2410 F.... pulseaudio
Date: Mon Mar 12 11:06:46 2018
InstallationDate: Installed on 2016-12-08 (458 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.vendor: Intel Corp.
dmi.board.vendor: Intel Corporation
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