Why is there an echo when multimedia files (mp4) inserted in my online help are played in FireFox? Should I be using a different video file format?

I am generating Responsive HTML5 using RoboHelp 11. My FireFox version is 31.
The video plays fine in IE and Chrome.

It may be the audio encoding of the file. (See Media formats supported by the HTML audio and video elements - HTML | MDN for an overview of supported codecs per browser.) MP4 should generally be safe. Since the video plays fine in IE and Chrome, I suspect this is a browser issue. I would advise you to also take this up with the producer of the video. Perhaps they have some futher insights.
Kind regards,
Willam

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