virtualbox.org

I use vbox to run windows 8.1 (x64) for Skype for business 2016 and Webex apps. When i use vbox 5.1.32 - everything works good, but for vbox 5.2 there is a problem with the audio: the sound disappears after a few minutes of call (skype, webex). in vbox 5.2.6 when a call or conference there is no sound at all.

Debug log for vbox 5.2.6 vm in attachment.

Host system: Fedora 27
Guest system: Windows 8.1

I had the same issue with 5.2.6, I downgraded it to 5.2.4 to make it work now. It seems the issue is with the update only.

There is a same issue with vbox 5.2.4 too, but here is a little different behavior: The sound disappears not immediately but after a while.
Log in attachment.
I was forced to make a downgrade to version 5.1.32, there are no problems with sound.

Please have a look at the following page to help us getting the required information to debug this issue further: https://www.virtualbox.org/wiki/AudioDebug

Thanks!

I get logs with this command from the AudioDebug guide: Is the need for an audio record critical?

If you're testing 5.2.x, those steps aren't needed -- please read the article carefully again.

Host: Ubuntu 16.04
Guest: Windows 7
Version: 5.2.6

I'm also affected by audio issues in 5.2.x series. In 5.1.x series audio is working fine.

I think I found how to reproduce issue. It happens every time when application request for recording (microphone). It happens in both WebEx and Skype for Business, probably in other applications too.

I attached log file with audio debug enabled.

00:01:57 - Youtube video in Firefox, audio working fine
00:02:17 - WebEx application started. Youtube audio is heavily distorted. I can also hear my voice in the headphones (microphone is enabled). Probably due to hight CPU load Youtube video stutters.
Few seconds later: Youtube audio disappears entirely. I can't hear any input from microphone.
00:02:18.685174 HDA: Warning: FIFO underflow for stream #0 (still 612 bytes needed)
00:02:18.720294 HDA: Warning: FIFO overflow for stream #4 (820 bytes outstanding)
00:02:36 - WebEx application shutdown. Youtube video started to work correctly but no sound.
00:02:56 - Paused and played again Youtube video - audio working fine.

In VirtualBox 5.2.x older than 5.2.6 (I don't remember which one, probably 5.2.4 and 5.2.2) I had different issue. In WebEx sound disappears after a while, 10 to 30 minutes. When it happened it affected whole guest system, not only WebEx. Reconnecting to the WebEx meeting fixes sound, but with each reconnect time without audio problem was shorter. After a while guest system restart is required.

Should I file bug report somewhere?

Ok, so in other words, audio only is misbehaving if you are doing simultenous input and output processing?

pentagonik wrote:Ok, so in other words, audio only is misbehaving if you are doing simultenous input and output processing?

Input is breaking things, even if it is disabled in the "Devices" menu.

As commented in https://www.virtualbox.org/ticket/17497 the latest test version (5.2.7) fixed this issue.