Reverse events without mirroring the picture
Reversing changes the order of the recorded moments. A falling object appears to rise, and a person walking forward appears to retrace their steps. It does not exchange the left and right sides of each frame, which is a separate mirroring operation. The result keeps approximately the original duration and pace. Choose a source with clear motion if you want the backward effect to be easy to see. Static shots or long pauses may look much the same in either direction.
Start with the short section you need
Choose a source of up to 60 seconds, 512 MB, and the supported 1080p pixel limits. If the interesting movement sits inside a longer recording, trim that passage first. Reversing requires reading frames in small batches and writing them in backward order. The implementation limits each decoding window and checks its estimated frame memory. Very high frame rates can still exceed that check, so reducing source resolution or frame rate may be necessary even when the recording is shorter than a minute.
Treat the download as a silent new version
The tool encodes the reversed picture as H.264 video inside an MP4 and omits the source audio. It does not reverse speech or music, and there is no option here to keep those tracks. Save the source if you might need its sound later. Check the first and last moments of the new file, because their roles have exchanged. Re-encoding can change image quality or file size; reversing the download again is not a way to recover an identical copy of the original file.
Build a forward and backward sequence
For a back-and-forth effect, save the reversed result and join it after the original using the separate merging tool. Use a silent copy of the original if you want consistent silence across both halves, because the reversed half contains no audio. Review the meeting point where forward motion changes direction. A pause or held pose at the end of the source will also affect that turning point. This page creates only the backward version; combining the two directions is a separate step.