MP4 video has no audio in itunes or on ipad 2i

Hi
I have some digital camera videos which using VLC software i have changed to MP4 and on my laptop they play well with good audio sound.
Once i add them io itunes the picture is distorted and there is no audio.
I have checked all the volume controls and still no joy
I have not updated my Ipd to OS7 yet.
Any ideas??
Claire

"Muxed" means that the video and audio are together on one track. FCP needs them to be in separate tracks. As mentioned above, get Mpeg Streamclip--it's free and is TREMENDOUSLY useful. When you drop the clip into it, you want to export as "Quicktime" (the resulting file will be a .mov file). Streamclip will present you with a number of codec choices and other settings. Once that file has been imported into FCP and the clip then dropped into the FCP video timeline, the audio will also show up in its own separate timeline.

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