How can I convert my existing videos into the required MP4 format?

ron/ July 30, 2016/ /

I recommend using the ffmpeg command line tool that is available for most platforms. 

Tip (especially when converting PAL and NTSC based videos): ensure that the resulting video has a Pixel Aspect Ratio of 1:1. Otherwise your videos might not be displayed in the correct aspect ratio

For example:

ffmpeg -i my_video.avi -y -c:a aac -c:v h264 -vf scale=iw*sar:ih my_video.mp4

This will convert “my_video.avi” into a compatible mp4 file and ensure square pixels.