MPEG movie crashes Etoys

I was trying to use MPEG movies in Etoys. I created MPEG profile-1 movies from MP4 movies using a free software called Kigo Video Converter. I found that Etoys always crashes when I was trying to play one of the converted MPEG movies, which I don’t understand because I used the same converter software and was able to play the converted MPEG movie file using QuickTime Player without any problem. 

Can anyone explain why this is happening and how I can get around the problem? In the previous email I attached the original mp4 file and the converted mpeg file, but I was asked to email again without those files. 

Thank you so much for your help.

Young-Jin