There are several reasons that may cause issues during video encoding. In most cases, these issues are caused by unstable or out of date graphics driver. Please try the followings for troubleshooting:

1. Save video again with another format (MP4/WMV/HEVC) or encoder (Hardware/Software encoder).
   Note: if you are using Nvidia graphics adapter and want to save video with high quality settings of 4K 60 fps, it is recommended to select MP4 (HEVC/H264) as output format.
2. Update your graphic driver as instructed here.
3. Check if you have sufficient free space on your C: drive.
4. Open Microsoft Store to check if you have the latest app version installed.
5. Update your PC to the latest Windows 10/11 version.
6. Convert your video source files using the Convert Video quick tool (with the preset For HD Movie Maker), then add the converted files to your project instead of the source files.
7. Repair/Reset app before trying again by following this instruction.
8. If the problem still persists, contact us via the Feedback section or via email.

Out of date or unstable graphics driver may cause severe problems such as slow or unstable video encoding. Sometimes it may cause freezing video playback, or even unexpected app crash.

If you experience stability issues with HD Movie Maker, one of the most important thing to do is to reinstall and update graphics driver. You will need a driver that is 3 months old or newer to work best.

• Open Device Manger → Display adapter
• Right click on your display adapter name and select Uninstall device
• Select Delete the driver software for this device before pressing Uninstall to make sure the current driver is completely removed
• After that restart your PC and open Device Manager again to update the Display adapter’s driver. Windows 10/11 will try to find and install the latest driver (that it knows) to your PC.

After that, download and install the latest driver from manufacture's website, depending on your display adapter as below.

• Intel HD Graphics
• nVidia
• AMD

The app price is for one time payment and you also get free future app updates. There will be no recurring cost.

Yes, you can. As per Microsoft Store policy, you can install your paid apps on up to 10 different PCs for your own use.
Please open our app listing page on Microsoft Store, then log in with the account you used when you purchased HD Movie Maker - PRO. After that Microsoft Store will recognize your app license and you will be able to install HD Movie Maker again.

Thank you for buying our app. You can install the PRO app and continue working on the project you created with the FREE app. Please follow the steps below:

• Close the FREE app.
• Purchase the PRO app from Microsoft Store and install it on your PC.
• Open the PRO app and select Recent Project from main page to load the autosave project.
• After the project is loaded successfully, press Save project on the bottom toolbar to save your project.
• Now you can continue working with the project saved and all features enabled. You can uninstall the FREE app to tidy up your PC and save some disk space.

Note: DO NOT create any new project on either FREE or PRO app before loading the recent project. Otherwise the new project will overwrite your previous unsaved project.

Please open Windows 10/11's Settings → About your PC and check if you are using Windows N or Windows KN edition. If you are using one of these versions, you will need to install some additional software components to enable media decoding/encoding. Please follow the steps below:

• Install the Media Feature Pack for N versions of Windows 10/11
• Restart your PC. Then, do a check for Windows update to get all the latest update for the feature pack.
• Install Microsoft Photos
• Install all media codecs and Movies & TV from here
• Open Device Manager → Display adapter and update your graphics driver if necessary. More information here.

Finally try create new project again with HD Movie Maker.

This issue may happen if your source video file was encoded with a color profile that is not compatible with your Nvidia/AMD graphics adapter.
Please try one of following:

• Use the Convert Video tool to convert your video source files with the preset For HD Movie Maker, then use that converted MP4 files in your project instead.
• When saving the video, choose the software encoder for better compatibility.

In some PCs audio out of sync may happen during video preview in project timeline page. That may cause problem if your project requires exact matching betwen video content and audio content.
In this case, please follow the steps below:

Press the Settings button and check the option “Check audio synchronization”.

Open Soundtrack editor page, edit the soundtrack and change the duration of the photos in your project so that the soundtrack timing perfectly matches video content.

Go back to project timeline and start preview. The audio from soundtrack may pause for short time during clips transition, but that does not affect final video file when you do Save video. When you Save video, the audio in output video file will match video content as what you edited in Sound track editor.

If your screen record file was encoded at non-standard frame rate, you may experience out of sync between audio and video when editing that video file.
In this case, you should use a screen recorder software that is capable of saving video at standard frame rate, such as our app HD Movie Maker, or the popular open source OBS Studio.

Try running the following command in Windows Powershell:

Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

This solution is from here

This means HD Movie Maker had problems when requesting folder read/write permission.
Please open Manage Projects, then select the Home Folder settings button, and set the app’s Home Folder to a new location. This is where all your data and projects will be saved. After that, you will be able to create new projects with HD Movie Maker.

You can add a blank title to the end of your project, or after the clip that you want. This will add fade-out effect at the corresponding position.