HELP!! How can I change my project from m4v to mp4?

I have created and finalized a project and exported to video. I know it's in 1080 HD and it exported to an mv4 file medium quality. No problem, video looks great, but now I need to upload it as an mp4. I t exported my finalized project as Quicktime to mpeg-4 and the video is completely distorted and horrible quality. I am restricted to size so could only export it as mpeg "basic". Is there any other way?? I have read that I could just re-name the m4v file as an mp4 - does this really work? Or do I have to use software to do this?

tjc73 wrote:
I have read that I could just re-name the m4v file as an mp4 - does this really work? Or do I have to use software to do this?
I just tested this on an m4v file - from a project that I had initally created in iMovie and exported as Large (960 x 540). I changed the extension to mp4 and it played perfectly. It was identical in quality, format (H.264) and size to the m4v file.
In Finder, I clicked on each file to check the file info and also right-clicked and selected Get Info. The m4v file showed "Apple MPEG-4 movie". The mp4 file simply showed "MPEG-4 movie".
So, it appears that no conversion is necessary.
I've previously changed the extension on m4v files to .mov - these also played perfectly. My reason for doing so, was to enable Chapters (or was it fast forwarding?) on my Western Digital Media Player. Originally, the player didn't support the particular feature when playing back m4v files. But this has now been fixed with a firmware update, so all is well and there is now no need for me to change the extension.
John

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