To be able to sync all the voices successfully, all the videos need to share the same time frame. Changing video frame rate after the fact is very processor and time consuming, so we’d like you to set your camera or smartphone to 24 frames per second (or 23.98) if the device allows it.
This is how you can do that on a few different devices:
iPhone or iPad
Go to Settings > Camera > Record Video > 1080p HD at 24fps
Some earlier models may not have this option, in which case you may need to use a 3rd party app like Filmic Pro to set frame rate to 24 fps.
Android smartphones / tablets
This is unique for each brand and model, but it should be available in the camera settings. If the device only lets you choose between 30 and 60 fps, you may need to use a 3rd party app like Filmic Pro to set frame rate to 24 fps.
Movie Shooting > Movie rec. size > 1920px 24fps
If you can’t find the option of 24 fps in this menu, please go to Settings > Video system and select NTSC instead of PAL. Then return to Movie rec. size and select 24 fps.
Fujifilm mirrorless cameras
Move setting > Movie mode > 4K 16:9 or FHD 16:9 – 24p – 100 or 200Mbps
Panasonic mirrorless cameras
Motion Picture > Rec quality > 4K or 1080p – 100M – 24p