You can use the following command to reverse a video with ffmpeg:
```sh
ffmpeg -i my_video.mp4 -vf reverse my_video_reversed.mp4
```
Note that this command reverses only the video, not the audio. If you'd like to reverse both the video and the audio, use the following command:
```sh
ffmpeg -i my_video.mp4 -vf reverse -af areverse my_video_reversed.mp4
```
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