Fix 0xa00f4243 CameraReservedByAnotherApp Error

Web cameras on Windows devices have become a necessity nowadays since work from home has had a huge impact on services. Windows 10 has a special application, i.e., UWP, for the camera app to be used for recording videos and taking pictures. Surprisingly, some users have encountered annoying error code 0xa00f4243 while using the Camera UWP app. This fatal code indicates that the camera has been used by another program already. Eventually, it will throw an error message such as: “Close other apps. It looks like another app is using the camera already. If you need it, here’s the error code: 0xa00f4243<CameraReservedByAnotherApp> (0xc00d3704)”

Not only in the current version of Windows 10, but we also have the same camera error in older editions of the Operating System as well. Error code 0xa00f4243 prevents users from using the camera application, restricting access to record videos and take photos, as well as other related tasks. Usually, the issue shows up due to outdated webcam firmware, software conflicts, corrupted system components, and often due to invalid entries in the Windows Registry.

0xa00f4243<CameraReservedByAnotherApp> (0xc00d3704)

Here is how to fix 0xa00f4243CameraReservedByAnotherApp (0xc00d3704) Windows 10 –

1] Update the webcam driver to the latest firmware

Error 0xa00f4243 often gets generated when the webcam driver you are using is an outdated version. Drivers are the firmware that maintains interaction between the accessory and the associated software. An outdated driver becomes the root cause of many severe issues, like the one we are now dealing with. You can easily update the drivers on Windows 10 devices, as there is a default Device Manager to serve this purpose. To carry out this task, follow the guidelines below –

1. Press Windows + S.
2. In the search bar, type devmgmt.msc.
3. Hit – Enter.
4. When Device Manager shows up, double-click – Cameras.
5. From the expanded list, right-click on the camera driver and select – Update driver.

6. Opt for – Search automatically for drivers.
7. Comply with the on-screen instructions to get the updated driver.
8. Once the process ends, restart your PC.

2] Reinstall the camera driver

In most cases, updating the camera driver is the key solution to standalone errors rooted in software conflicts. However, this doesn’t always go smoothly, as there are a good deal of buggy updates available all around. Installing a defective update might cause additional issues in the system instead of resolving the error.

Hence, you can permanently erase that driver from Device Manager and then reinstall the webcam driver from a trusted vendor’s site. If updating the webcam driver doesn’t fix the Error 0xa00f4243, follow the instructions below to reinstall the driver –

1. Right-click on the Start button and choose Device Manager.
2. When the dedicated window appears, double-click – Cameras.
3. Right-click the installed camera driver and choose – Uninstall device.
4. To give final consent, click – Uninstall.
5. If the system asks for a restart, do it.
6. When the system powers up, the webcam driver will be installed automatically.
7. Alternatively, you can visit the manufacturer’s site to download the compatible driver manually and install it.

3] Check whether your device can access the camera

If the system doesn’t have permission to access the camera, multiple errors may prompt while using it. Though camera access remains active by default, it may go off for some inconvenience. However, you can allow access again by making a few changes in the settings. Steps are mentioned below:

1. Press – Windows + I.
2. From the Settings window, click – Privacy.
3. Once on the next page, choose Camera from the left sidebar.
4. Move to the right.
5. Click – Change.
6. Switch the toggle button to right in order to allow camera access for this device.

If any specific app triggers 0xa00f4243<CameraReservedByAnotherApp> (0xc00d3704) in Windows 10, check whether that application has permission to use the camera. For that:

1. Visit the same settings page as we discussed above.
2. Turn on the toggle button present beneath Allow apps to access your camera.
3. Scroll down a bit and look for the app triggering the issue.
4. Allow access for the same by switching on its toggle button.

4] Close other applications using the camera

The error code 0xa00f4243<CameraReservedByAnotherApp> (0xc00d3704) clearly indicates another application is using the camera app. The system also urges you to close other applications using the camera as well. However, if you have applications running in the background like Skype, Zoom, Facebook Messenger, Yahoo Messenger, the system may trigger this error. Therefore, to eliminate this trouble, close the other application from Task Manager. To carry out this task, follow the guidelines below –

1. Right-click on the taskbar and choose Task Manager.
2. If the window is not expanded already, click – More details.
3. From the Processes tab, find the programs that use the camera.
4. Once you find any, select it and click End task.

5] Set Camera as default app

Though the reason is unknown, many Windows 10 users said the issue 0xa00f4243<CameraReservedByAnotherApp> (0xc00d3704) gets resolved after setting the camera as the default app. You can give it a try too.

1. Press Windows + I.
2. From the dedicated window, click Apps.
3. Move to the right side of the next page.
4. Go through the app list to find Camera.
5. When you find it, select it and then click Advanced options.
6. Scroll to the bottom of the next page and tap – Set defaults by app.
7. Click on Camera and opt for – Manage.
8. Make sure all applications have access to the Camera as the default one.

6] Deny Permission for other Camera apps

Some applications, even after closing from Task Manager, restart after a certain time interval. If you have closed them, they still can access the camera app and eventually end up showing error 0xa00f4243<CameraReservedByAnotherApp> (0xc00d3704). From the Task Manager, you can again manually close them, but that will be a little tiresome.

The ideal way is to deny their permission for the apps to use the camera in some instances. This will disable their function in the background and will not be able to raise the camera request. Eventually, there will be no chance of getting the error. To accomplish this workaround, follow the guidelines below:

1. Open the Windows Settings app.
2. Click – Privacy.
3. From the left column, choose Camera.
4. Shift to the right and make sure the Allow apps to access your camera toggle button is on.
5. Scroll down a bit and disallow the apps that utilize the webcam except the Camera app.

7] Reset Camera Application

Resetting the camera app oftentimes can eliminate the Error 0xa00f4243 in case other workarounds don’t come into effect. To do this, follow the guidelines below:

1. Right-click the Start button and select Settings.
2. Click on Apps.
3. Move to the right pane of the appearing page and find Camera.
4. Select it and then click the Advanced options link.
5. Scroll down a bit and thereafter hit – Reset button.
6. To give final consent, once again click – Reset.

8] Enable the camera using the dedicated laptop key

Some laptops allow users to enable or disable the built-in camera using physical shortcut keys. If your webcam is disabled, you might need to press the hotkey to enable it again. Since the key varies from device to device, take help of Google Search to find out the key that will work for your laptop. However, the FN + F8 shortcut key works to enable the camera on most laptops.

9] Run the Windows Store App Troubleshooter

Windows Store is the most trusted source of applications, and obviously, the programs are certified by Microsoft. However, some apps don’t count the legacy and come with buggy components inside. Since the Camera app is one of the built-in apps in the Windows Store, it’s not strange to have issues with it. However, you can resolve the trouble easily by running the Windows Store App troubleshooter. Here are the guidelines to accomplish this –

1. Press – Windows + I.
2. Select – Update & Security.
3. From the left column, choose – Troubleshoot.
4. Move over to the right and then click the link saying – Additional troubleshooters.
5. Locate – Windows Store Apps.
6. Select the same and click – Run the troubleshooter.
7. Comply with on-screen instructions to finish the procedure.

10] Ensure Capability Access Manager (CamSvc) Service is running

Services are the core components of the Windows Operating System, and their task is to enable the creation and management of long-term processes. Likewise, the Capability Access Manager (CamSvc) service is pretty much essential in order to run the Camera app without any issues. If this service is not enabled, you can get error 0xa00f4243<CameraReservedByAnotherApp> (0xc00d3704) while accessing the Camera in Windows 10. Starting the service will be the key solution, and for that, follow the guidelines below:

1. Open Services.
2. Look for – Capability Access Manager service.
3. Right-click the same and choose – Properties.
4. Change the Startup type to Automatic.
5. If the service is not running already, click – Start.

6. Hit Apply followed by OK.

11] Make use of the default Hardware and device troubleshooter

The method of identifying the operational as well as technical issues in a Hardware device in Windows 10 is the Hardware Troubleshooter. You can resolve any physical or logical problems easily by running this built-in utility.

Since the webcam is a hardware device, any issue related to this can be resolved by running the Hardware and Device Troubleshooter. Here are the guidelines to run this –

1. Open Command Prompt as administrator.
2. Enter the following in the black pane and hit Enter –

msdt.exe -id DeviceDiagnostic

3. When Hardware and Devices Troubleshooter prompts, click Next.
4. If the utility presents a list of display devices that have issues, select the camera since you want to troubleshoot.
5. Click Next.
6. If the tool comes up with an automatic repair, hit Apply this fix.
7. Lastly, click Next and let the system restart.

12] Rectify corrupted system components with SFC scan

Corrupted system components are more likely to cause unexpected issues in Windows 10. 0xa00f4243<CameraReservedByAnotherApp> (0xc00d3704) can be a result of the same. By running an SFC scan, you can resolve the corruption and replace the missing system elements that are necessary to run the system seamlessly. The utility mainly replaces any corrupted system files with fresh locally stored copies.

1. Click the search icon on the taskbar.
2. Type – cmd.exe.
3. When you see Command Prompt at the top of the results flyout, press – Ctrl + Shift + Enter.
4. To allow User Account Control, click – Yes.
5. In the appearing black pane, type – sfc /scannow.
6. Hit – Enter key.
7. When the scanning process ends, reboot your PC.

13] Start dedicated camera service

Some of the users who were struggling with 0xa00f4243<CameraReservedByAnotherApp> (0xc00d3704) error reported that the issue resolved after starting the dedicated camera service. The camera might be using a different service; hence, the name of the service that you need to enable may vary.

1. Press Windows + R.
2. In the Run dialog, type services.msc.
3. Click OK.
4. When the Services window appears, look for the camera service dedicated to your device.
5. Usually, the name of the service remains Intel(R)RealSense(TM)Depth.
6. Right-click it and select Start.

14] Tweak the registry

Lately, Microsoft has come up with a new rollout that no longer supports the MJPEG or H264 encoding standards. Therefore, some of the devices that use these codecs for built-in webcam videos or images will have issues like Error 0xa00f4243.

However, if you have received the new rollout in a relatively older version of Windows 10, devices can ignore this feature. For that, you have to tweak the Windows Registry a bit and change the DWORD to disable the underlying feature. Follow the steps below to accomplish this:

1. In Windows search, type – regedit.
2. Hit Enter.
3. When User Account Control asks for consent, click – Yes.
4. Once in the Registry Editor window, navigate to –

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Media Foundation\Platform

5. Move over to the right pane.
6. Right-click on an empty space and choose New => DWORD (32-bit) Value.
7. Name the key EnableFrameServerMode.
8. Double-click the newly created DWORD key.
9. Also, enter 0 in the Value data box.
10. To save the changes, click OK.

11. Restart the device and check for the error

That’s all!!