VideoLAN Movie Creator is a freeware non-linear editing software for video creation based on libVLC and running on Windows. You can create your own videos with custom resolutions using this freeware tool. The application is currently in alpha stage, so you might encounter bugs. You can create your own project and then specify the settings for the video. After you install the application, first you need to set up a project.
Specify the audio and video settings for the project.