If the codec for MOV file is missing, then you are not able to do anything about it. You should redownload the codec or try other converter which supports it.
With the right application, converting a MOV video file to MP4 is not a hard thing to do. If you are not sure what application you should use to do the work, then I would like to recommend Leawo Video Converter to you, as it is by far the most powerful, user-friendly and personalized video converting program I have ever used.
Source: Does VLC play MOV files?
Regain or re-download the MOV file. It may be not intact. Or it can be broken. In this case, you can try some ways to fix the mov file. Or you can try soem other MOV converters to change the mov format.
Try Handbrake, it's the best free video convertor out there IMO.
http://handbrake.fr/
2Load Kodak videos to Higosoft Kodak Movie Converter
Load the MOV movie file you wish to convert, you can load a video folder or several video files at one time, the program supports batch load and batch converting.
3Choose output video profile
Kodak Movie Converter presents you a full list of output formats; you will find one that suitable for you. 
5Click "Convert" button to start convert Kodak video
When starting the process to convert Kodak video (usually .mov file) you will feel it is surprisingly fast. Converting batches of mov file is quick, easy and produces great results. 
If you want to put the output MOV files on your iPad, iPhone, iPod,
Apple TV or other popular portable devices for playback, you can choose
the presets for iOS devices offered in the format drop-down list as the
output format. Because the app has optimized the video settings for the
output files, so the video could fit on your devices perfectly. What's
more, if you select any item from the Apple Devices as the output
format, the app could import the output video files directly to your
iTunes on Mac (Snow Leopard, Lion included).
Note: The AVI to MOV converter Mac
additionally offers you some useful edit functions for making your
videos more enjoyable. You can split, crop, add cool effects to your
media files or capture your favorite scene of the video. To learn more
details, you can go to the User Guide of Video Converter for Mac.
3
Start to convert AVI to MOV Mac
Hit the "Convert" button and let this smart AVI to MOV Mac Video Converter
do the rest for you! This video converter was specifically designed for
Mac OS users. It performs greatly on iMac, Mac Pro, MacBook, MacBook
Pro, MacBook Air either with Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow
Leopard or Mac OS X Lion.
When the conversion is done, you can play the output MOV videos in
QuickTime, edit them in iMovie, Final Cut Pro, or put them on your iPod,
new iPad 2 for playback whenever you like. It is cool, right? Have a
nice media experience then!
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