Video Viewer for High-speed cameras
XForm Viewer
XForm Viewer is a video player that supports synchronized playback of multiple video files. It is especially designed for comparing and analyzing videos captured by high-speed cameras.
For Windows 10/11 64bit
The current version 1.6.X is available for free.

Features
Simple, lightweight, and powerful.
Save and Load Projects
Save your progress on multiple videos and pick up exactly where you left off.
Wide format support
Compatible with AVI, MP4, M4V, and most other formats.
From beginners to experts
Simple touch for beginners. Advanced mouse & key combos for power users.