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Windows Forum / Virtual PC / May 2008

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Record voice problems

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novecento.alessio.leoncini - 12 May 2008 18:20 GMT
Hi,
i'm trying to record voice from a microphone on a Vista Guest OS using the
Sound
Recorder/Camtasia Recorder. The result is a little choppy with some dropped
frames here and there - definetely not good enough to share with anyone.

On XP Guest i don't have this problem.

What can i do?
Thanks
Colin Barnhorst - 12 May 2008 18:42 GMT
Use the one that works the best.  The emulated hardware in a virtual machine
is not ideal for what you are trying to do anyway so why not just use the
host?

> Hi,
> i'm trying to record voice from a microphone on a Vista Guest OS using the
[quoted text clipped - 7 lines]
> What can i do?
> Thanks
novecento.alessio.leoncini - 12 May 2008 19:01 GMT
I would like to use a guest machine to record a screencast and have a system
free of any custom configurations that i have done for my work, files,
folder, video size, DPI, ecc..
I would like to use Vista for current work environment and to give
satisfaction to Microsoft's developer :) ; above all, i would like to know
why this behavior only on Vista!

> Use the one that works the best.  The emulated hardware in a virtual
> machine is not ideal for what you are trying to do anyway so why not just
[quoted text clipped - 11 lines]
>> What can i do?
>> Thanks
Colin Barnhorst - 12 May 2008 20:39 GMT
The answer is probably related to the fact that Vista vms and XP vms do not
use the same emulated sound device.  Check the device manager in each.

The reason is that the virtualization team picked the ISA version of the
SoundBlaster 16 for emulation in VPC.  Vista does not support ISA devices
and therefore cannot detect the emulated SB, so when Vista came along the
team developed a new sound device called the Microsoft Virtual Machine Audio
Device.

I suspect that the difference in performance lies in the differences between
the emulated hardware and their drivers.  How to address that I don't know,
but there it is.

>I would like to use a guest machine to record a screencast and have a
>system free of any custom configurations that i have done for my work,
[quoted text clipped - 18 lines]
>>> What can i do?
>>> Thanks
Steve Jain - 12 May 2008 21:19 GMT
>The answer is probably related to the fact that Vista vms and XP vms do not
>use the same emulated sound device.  Check the device manager in each.
[quoted text clipped - 8 lines]
>the emulated hardware and their drivers.  How to address that I don't know,
>but there it is.

Not to mention that Vista is a bigger OS with more overhead, and so
uses more CPU which affects the performance of emulated hardware like
the sound card.
Adding more RAM may help, as moving the Vista Vm to a separate hard
drive, additionally, a faster multicore CPU will also help reduce the
possibility of sound issues, but you can't escape it completely.

Signature

Cheers,
Steve Jain, Virtual Machine MVP
http://vpc.essjae.com/
I do not work for Microsoft.

novecento.alessio.leoncini - 13 May 2008 08:57 GMT
Thanks for answers, i try to add more RAM but nothing improvement of my
issue : (

>>The answer is probably related to the fact that Vista vms and XP vms do
>>not
[quoted text clipped - 19 lines]
> drive, additionally, a faster multicore CPU will also help reduce the
> possibility of sound issues, but you can't escape it completely.
 
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