VideoMirror

Mirrors video vertically and horizontally, speeds up or slows down, rotates by 90°, and compresses video height and width — useful for correcting distorted videos on websites.
How It Works
Keyboard Shortcuts:

Alt + * (Numpad): Show/hide the control panel.
Alt + 4 / 6: Compress or stretch the frame horizontally.
Alt + 2 / 8: Compress or stretch the frame vertically.
Alt + 7: Reduce frame size on both axes simultaneously.
Alt + 9: Enlarge frame size on both axes simultaneously.
Alt + 1 / 3: Decrease or increase playback speed (step 0.01).
Alt + 0: Rotate video 90°.
Compatibility:

Works on practically all websites.