For those who have Bitdefender and are experiencing the problem, here's the fix.

Open your Bitdefender dashboard. On the left pane select "Protection"
On the Antivirus pane select "Open"
Under "Settings" click on "Manage Exceptions"
Click "+ Add an Exception"
In Windows File Manager navigate to C:\Program Files (x86)\Vmix
Drag Vmix64.exe into the exception box, turn on the "Antivirus" switch, and save.
Click "+ Add an Exception" again
Drag Vmix.exe into the exception box, turn on the "Antivirus" switch, and save.

You will now be able to load VMix successfully.

I don't disagree that Bitdefender is prone to false positives, and I don't use it on my primary VMix production machine - (Asus TUF F-15). For post production I use a desktop that, for compliance reasons, needs an AV solution more robust than Windows Defender, and I'm not alone in this. I'm not implying that this error is the fault of VMix, but for those of us who have to have a compliant AV solution it's good to understand the work-around.

The same issue applies to GData Antivirus.
Gen Variant Remcos detected

So it's not only Bitdefender. Is there a bigger issue. If a few AV softwares detect something there might be something.

This error is due to some files used by vMix being blocked or corrupted.
It is typically caused by a false positive from Bitdefender, but can also be caused if files have not been installed properly due to apps being open.

So please download again from our web site and ensure everything is closed, including Skype, Teams etc before installing.

We have also reported the issue to Bitdefender, but unfortunately have not yet heard back from them.

Regards,

Martin
vMix

Let me know if you would like me to create a separate thread, instead of continuing the discussion in this one.


I did a complete uninstall of vmix and all its dependencies.
I then manually deleted the old vmix folder and reinstalled, but am still receiving the same error.
I also tried running vmix as admin.

The only anti-virus I am running is Emsisoft Anti malware and already have all 3 vmix folders set as exceptions.

Is there a temp directory that I can/need to delete after I uninstall vmix? (Could this be caused by a corrupt cache or files in a temp folder?)

What directory/location is the "tmp1F.tmp" file located in?

Additional Computer Specs

OS: Windows 10
CPU: AMD Threadripper 3970X 3.7 GHz 32-Core Processor
Motherboard: Asus ROG ZENITH II EXTREME ALPHA EATX sTRX4 Motherboard
GPU: NVIDIA GeForce RTX 3080 Ti 12 GB Founders Edition Video Card
RAM: G.SKILL Ripjaws V Series 128GB (8 x 16GB) 288-Pin DDR4 SDRAM DDR4 3600 (PC4 28800) Intel XMP 2.0 Desktop Memory Model F4-3600C14Q2-128GVKA
Hard Drive:
(3x) Samsung 860 Evo 2 TB 2.5" Solid State Drive
(1x) Samsung 970 Pro 1 TB M.2-2280 NVME Solid State Drive
(1x) Samsung 970 EVO Plus 2 TB M.2-2280 NVME Solid State Drive
Cooling: IceGiant Prosiphon Elite CPU-Kühler
(6x) Nidec Servo Gentle Typhoon 68 CFM 120 mm Fan
NZXT Sentry Mesh 30W Fan Controller
Power Supply: EVGA T2 1600 W 80+ Titanium Certified Fully Modular ATX Power Supply

I'm happy to report that Bitdefender have now removed the false positive in their latest update.

The report you posted is of a temporary file used during installation.
This is completely normal and all application installers do this, they basically extract from the installer the files to the temp folder before installing them to the correct location.

It seems the antivirus you are using is overzealous and is reporting innocent actions as malicious.

We certainly do not advocate not using anti-virus, instead we recommend Windows Defender, as it is perfectly fine for protecting a computer.
It has high ratings in all recent anti-virus rankings and reviews
and is strongly recommended over 3rd party programs which tend to have problems like this every now and then.