I'm able to reproduce it using my backups. It seems to be related to the volume levels, as you've suspected.
== Trials == Conditions: Time A ... configuration from where I filed the bug Time B ... configuration from my post where I haven't been able to reproduce it anymore Config file V ... config file of vlc ($HOME/.config/vlc/*) Config file P ... config and state files (incl. volume levels) of pulse ($HOME/.pulse/*) So let's mix these. First trial period consists of all the possible combinations: AV+AP: noise AV+BP: noise BV+AP: noise BV+BP: no noise However, using the new config BV seems to alter something important in P: 1) fire up BV+AP, result: noise After vlc started, the pulse config/state file 657b92791ebe658fba9f363b4ba14252-stream-volumes.tdb has changed 2) Now firing up vlc yields some very subtle noise at the very begin of playing, but overall 'no noise'. 3) Afterwards there's not even subtle noise at the beginning I've attached both versions of the stream-volumes.tdb == Conclusions == Looks like pulse has ceased to run fine with some stream-volume settings which it had set on its own in a previous version. == Messages == Observation unrelated to above's trials: The following message is shown on console independent on whether there is noise or not: [aac @ 0x1b63650]Transition from an ONLY_LONG or LONG_STOP to an EIGHT_SHORT sequence detected. If you heard an audible artifact, please submit the sample to the FFmpeg developers. ** Attachment added: "stream-volumes in A condition (old setup with noise)" https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/772720/+attachment/2122755/+files/A_657b92791ebe658fba9f363b4ba14252-stream-volumes.tdb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/772720 Title: extreme noise with sound -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs