Not all Mp4 videos are created equal. In fact there are many variations to the standard that will not work in GoTo.
I have found a setting in Apple Compressor that will take any video I throw at it to make it a Mp4 file that will play nice with GoTo.
Every video I play within a GoToWebinar will go through this Compressor before I upload it to GoTo.
Find a video converter and test it out to find a setting that works for you.
Thanks for the comment.
How do you check if the video is working?
The two videos that I uploaded seems to be working fine but apparently, not to everyone.
What are the settings that work for you?
Here is another discussion with my video settings.