To mirror a video on Windows and Mac follow these steps using PowerDirector.
Step 1: Drag and drop your video to the PowerDirector Timeline.
Step 2: Select the FX icon to open the Effect Room in the left-hand toolbar.
Step 3: Scroll down to the Mirror effect.
Step 4: Drag and drop the Mirror effect onto your clip.
Step 5: To change the Mirror Effect Settings you’ll need to open the Effect Menu by selecting your video in the timeline and clicking on the Effects tab.