Convert mjpeg to ffv1

Download and install the latest version of Filestar.
Right click on one or more Mjpeg file(s) on your desktop and select Convert with Filestar.
Type convert to ffv1 in the search box.
Press Convert.

What is the difference between .mjpeg and .ffv1?

Name: Motion JPEG; FFV1 (Lossless Video)
Extension: .mjpeg; .ffv1
Format: Binary; Binary
Category: Video; Video
Developer: Microsoft
Description: It is a Motion JPEG that captures sequence images in a multimedia format — commonly used on digital cameras and webcams. It is a large file size that can be easily edited because of its low compression levels.
MIME Type: video/x-mjpeg; video/x-matroska
Wikipedia: .mjpeg on Wikipedia; .ffv1 on Wikipedia