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
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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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