Are you sure your mp4 is comatible to the browser you tested in?
It could be worth to explicitly convert it and retry.
Example conversion with ffmpeg
Code:
ffmpeg -i in.mp4 -vcodec libx264 -movflags faststart -b:v 800k -an -vf scale=1040:-1 -map 0 out.mp4
where in.mp4 is your source file, out.mp4 is the name of the file to be created, 800k defines the video bitrate and 1040 is the picel width the target video should be created with.
To also include audio you should replace -an with
Code:
-acodec aac -ac 2 -ar 48000 -b:a 96k
where 2 means stereo, 48000 is the sampling frequency of the audio to be created and 96k is the bitrate.
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