[vbox-dev] audio issues

Perry Halbert phalbert at cox.net
Wed May 24 18:11:45 UTC 2017

Thank you Andreas for the information.  My issue was not with the normal 
or test builds but the build from SVN and that still does not work ( Now 
at r67008 ). I used to be able to build with audio_stable but since that 
was removed approx 8 months ago sound just does not work.  Skips and the 
logs with audio debug are full of errors about stream being full expect 


On 05/24/2017 12:53 PM, Andreas Löffler wrote:
> Hello Perry/all,
> just wanted to let you know that there's a new 5.1 test build [1] 
> r115730 which should have audio improvements regarding HDA emulation 
> in combination with Windows 10 AU (Anniversary Update) + CU (Creators 
> Update) guests.
> Happy testing,
> Andreas
> [1] https://www.virtualbox.org/wiki/Testbuilds
> Kind regards / Mit freundlichen Grüßen
> ******************************************************************
> Andreas Löffler             | VirtualBox Engineering
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> On 27.04.2017 14:16, Perry Halbert wrote:
>> Good day Frank,
>> I too was surprised that there was an improvement. I look at the changes
>> and didn't really see any audio areas specifically worked on so I
>> calculated that the timing or buffers had been changed in some way on
>> the host side code.  To tell you the truth it always looked like a
>> buffer issue to me. Anyway it had improved for me for several days and
>> not anything that I have done, but today it is back to the same old ways
>> of the stuttering and audio out of sync with the video plus the whole
>> video skips ahead a second so even the video is jumpy.
>> I will continue to monitor this and let you know what I find, maybe not
>> right away this time.
>> Best regards,
>> Perry
>> On 04/27/2017 02:30 AM, Frank Mehnert wrote:
>>> Hi Perry,
>>> On Freitag, 21. April 2017 11:02:33 CEST Perry Halbert wrote:
>>>> As of today r66644 from SVN, audio is much improved but not fixed yet.
>>>> The stutter is improved but now there are popping issues. The
>>>> additional logging shows a greatly reduced amount of the stuttering 
>>>> due
>>>> to stream full but they still happen.
>>>> Host Linux 64-bit guest Mint-17 64-bit and tried both ac97 and 
>>>> intel hd
>>>> audio. I sounds like the intel hd audio might be better than the 
>>>> ac97 to
>>>> my ears but can not provide empirical data to support the assumption.
>>>> I don't do a lot with Windows these days but it appears that the audio
>>>> in a Win-7 guest has been acceptable all along if that is of 
>>>> interest to
>>>> you.
>>> thank you for testing. Some status update regarding sound in trunk 
>>> and in the
>>> 5.1.x branch:
>>> At the moment the code between trunk and 5.1 drifts away a little 
>>> bit. In
>>> principle trunk has the more modern audio framework, in particular 
>>> it moves
>>> more audio work from the EM threads (the VCPU emulation threads) to 
>>> separate
>>> threads. This is good for the timing and therefore good for audio 
>>> quality.
>>> Trunk audio didn't change for some weeks (it still needs improvements),
>>> therefore we are slightly surprised that you experience improvements 
>>> with
>>> the latest trunk updates. I'm also not aware of any recent VMM 
>>> updates which
>>> would improve timing...
>>> The 5.1.x branch still uses quite old audio code. We don't want to do
>>> fundamental changes in 5.1.x but we need to fix certain cases. 
>>> Especially
>>> we are aware that Windows 10 AU guests don't work well with 5.1.x 
>>> (including
>>> 5.1.20). Unfortunately fixing this is more complicated and conflicts 
>>> with
>>> our goal to keep the changes in 5.1.x minimal. I can only say that 
>>> we are
>>> trying to improve the situation with Windows 10 AU+ guests but we 
>>> still don't
>>> have a final solution.
>>> Kind regards,
>>> Frank
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