Reverse Video

How the Reverse Video works

Reversed footage is one of the oldest tricks in film, and it still works. Water leaps back into a glass, a jump lands in reverse, a messy desk tidies itself, a dropped phone flies into a hand. Short reversed clips are a staple of Reels and TikTok because the brain spots the impossible motion instantly.

How the reverse video tool works

Video files are built to be played forwards. Most frames are stored only as changes from the frame before, so a player cannot simply run backwards. The tool therefore works in two passes.

First it steps through your section at 30 frames per second, seeking to each moment and saving the frame as a high-quality JPEG in memory. Then it paints those frames onto a canvas from last to first and records the canvas as a new video at 30 fps. Two passes is why the progress bar moves through the capture first and the encoding second.

Why there is a 20-second limit

Every captured frame is held in memory until the reversed video is written. Twenty seconds at 30 fps is 600 frames. At 1080p, each JPEG is roughly 150 to 400 kB, so a full 20-second section can use 100 to 250 MB of memory. Longer sections would crash browser tabs on phones and older laptops.

If you need longer, reverse it in parts and join them in an editor, last part first.

Why the reversed clip is silent

Sound played backwards is mostly an unintelligible whoosh, and it rarely suits the clip. The output has no audio track, so you can add music in the app you post with. If you do want the backwards sound, extract the audio and run it through the audio reverser.

Tips and pitfalls

Pick a clear, single action. Reversal works best on one obvious motion: a pour, a throw, a jump, a crash. Busy scenes just look odd.

Shoot with the reverse in mind. Hold the camera still, start the action a beat after recording begins and keep going a beat after it ends, so the reversed clip has room to breathe.

Want it to bounce? The boomerang maker plays a section forwards then backwards in a loop.

Seeking is slow on some files. Long-GOP phone video and screen recordings can take a while to capture, because each seek decodes from the previous key frame.

How to read the result

The stats show the section reversed, the number of frames captured and the file size. Play the result before downloading to check the action reads well backwards.

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