Cluster size is a very important parameter. The result depends on the selected cluster size. If you need help I can connect via remote access: TeamViewer, Anydesk.

Take a look at the Log file. There is a result that will be in the full version. GoPro files are highly fragmented. The preview and the main video are saved alternately, the sizes of the fragments are always different. The algorithm searches for video fragments as accurately as possible.

Lrv files are video previews that your camera saves along with full-size video .Lrv files have less resolution and less size.
The file can be played by any video player that supports mp4 format. If the default program is not installed for this extension, you can select it through the "open with" menu.

Due to the nature of the file system, it is very important to start reading data from a specific sector to match clustering. Our software needs to find beginning of files, which is specified by the "start" field, and also move around the source by the size of the cluster. If you have problems with these values, contact us by e-mail soft@512byte.ua and we will help you set the parameters.

Our software has been tested so far only on this camera model. We plan to add support for more models, and we are making appropriate tests for these.
If you encounter a problem that you cannot solve, we are ready to supplement our software for your case or create a separate software for this case.

We decided that when setting the limit to 5mb, a sufficient number of video previews are saved to demonstrate the operation of the software.