M4v doesn't play in iTunes

Hi. I have an m4v file type that will not play in iTunes. I have opened with iTunes (default) but it just don't play. I have tried manually importing, yet nothing happens. Someone please help me. Thanks.

Quicktime / iTunes / Apple TV throw up a lot of errors with M4V / MP4 files that other media players do not.
I recommend downloading VLC as it is a much better media player than quicktime. If your file plays in that it is more than likely something simple with the Meta Data or chapters that is causing the error.
To fix the M4V file without having to transcode, I recommend downloading Metadata Hootenanny (FREE) from http://www.applesolutions.com/bantha/MH.html
Using that, add a movie chapter (VIEW > CHAPTERS) and save the file. It should save the file within a .mov container fairly quickly with the same quality video. You only need to save one chapter (more if you want) as iTunes stalls if it cant find chapter references in the M4V files. That .MOV file can be imported into iTunes and played on an Apple TV.
More errors with MP4 files that cannot be imported into iTunes can be fixed by simply remaning the file extension from .mp4 to .m4v
MP4 file that give the error " invalid public atom " when opened with iTunes can be fixed using VLC. Open the video with VLC and FILE > STREAMING/EXPORT WIZZARD
Select Transcode / Save to file, then select video from existing playlist item. Ensure the video / audio transcode options are UNTICKED as you only want to quickly change the container to .mov
Save the file and iTunes will be able to play / import.

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