I have had a similar problem with one of my cameras, I have not been able to investigate very well to resolve yet, but I assume it is a sampling rate issue conflict as there appear to be dropped samples/frames in the audio. The problem seems to get progressively worse the longer the input remains live.

I have a job coming up in a two days and need to get this issue resolved. Does anyone know of a solution for this?

Martin
Do you have a correction for this? I have a job to do tomorrow but am unable to with this problem.

Greg

Luc
Thanks for your reply. I am running Win 7 64bit. I have no experience with latency issues and don’t understand why it worked great in the last version of vmix but not after I have updated. I will look at this site to see if I can make any sense out of it.
Thanks
Greg

I am adding a camera via firewire. I have tried two different cameras. From the drop down list i have tried the built in audio, vmix audio and all of the items it will allow and all have this issue.

Greg

Martin
The numbers vary. Before it starts acting up they are both 0. Once it starts the numbers change as time goes on. Here is one example of what they have run. I have to close the window and reopen it to get the numbers to refresh.
As it started the dropped went to 17 and Latency 78, refresh dropped 117 latency 45, refresh dropped 245 latency 1, refresh 368 latency 44, refresh dropped 496 latency 1, refresh 546 latency 68.
It seems that the latency stays at 1 when the audio is ok but when it starts to sounding choppy the latency number goes up and causes the dropped number to go up.
As I said before this wasn't a problem with the same camera and firewire on the version 4.

I wish you could have corrected it sooner because I will loose a job today because of this issue. I was to do a three day basketball tournament the next three days. If you can offer a correction today I may not loose the job for the next two days.

Thanks
Greg

Luc
I haven't used LatencyMon at the moment. I was waiting to see what Martin came up with being it worked fine on the last version I had installed.
I may have to go ahead and check it to see where the problem is coming from.

Thanks
Greg

Greg
Are you able to by-pass the firewire audio from the camera?
(i.e. an independant mirophone audio input)
I realize this is a work around, but it works for me, I turn the camera audio way down and input a microphone from my Behringer USB mixing board.
The LatencyMon testing gave me this report:
"Your system appears to be having trouble handling real-time audio and other tasks. You are likely to experience buffer underruns appearing as drop outs, clicks or pops. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. At least one detected problem appears to be network related. In case you are using a WLAN adapter, try disabling it to get better results. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
LatencyMon has been analyzing your system for 0:02:30 (h:mm:ss) on all processors in the system."

I run win7(x64) i7 950 @ 3.07GHz
on a Gygabyte MB

Lots of drivers and lots of numbers there...
What exactly would I be looking for?
And why is this only an issue in vMix with camera audio through firewire?

You had me worried with that latency monitor program.... ;-)
I tried it on my system and found the same warning about power management, throttling CPU etc so i disabled that.
Still the same warning though it is constantly running 3804 Mhz on all cores.

I just tested the (analog)sound input via the line-in from my main board, combined with the SDI picture from the Sony EX-3 that I have here and found, besides a delay of approx 30-60ms, nothing wrong in my system.
It does need some experimenting with all the volume settings, because the Sound Blaster software, as well as the Windows sound configurations all interact with each other and it is not always clear what the best routing is.\

At this moment I have the following settings, which seem to work:
In Settings, Audio tab: Default Audio Renderer = Default Direct Sound Device

Adding an input: Capture = Decklink video Campture Audio = Line in (soundblaster)

In Recording Setup: Audio Device: vMix Audio

In the windows Audio options I then have to pull the fader for vMix HD down or use a headphone instead of the speakers or I will have feedback.

Rob