This is an application that converts the selected video to a reverse playback video.
Creating a reverse video will take some time.
In addition, since the creation of reverse playback videos is done on the device, there is no need for an Internet connection.
It also supports 10-bit HDR video. You can create HDR reverse playback videos.
This app is open source.
https://github.com/takusan23/DougaUnDroid