I personally use Cyberlink Power Director on Android for doing this, you need to slow it down to around %45 and then export the video at 24 FPS

I personally use Cyberlink Power Director on Android for doing this, you need to slow it down to around %45 and then export the video at 24 FPS

Export Steps with Power Director

1 - Select Save Video

2 - Select Save to Device

3 - Select Options

4 - Select Frame rate

5 - Select 24FPS

6 - Optional Bit rate

7 - Save

8 - Export