"I am trying to import an mp4 file created from a DVD into iTunes' Movie library. I've tried both "importing a file" and "drag-and-drop" methods but no avail. In the latter method, on dragging a "plus" sign follows the drag but then nothing happens. Waited a couple minutes to see whether a status bar indicating the import would initiate but it does not. I am using the latest version of iTunes. Music files work fine, why not this MP4 video?"
Most Effective Tool to Convert MP4 to iTunes on Mac Computer
Basically, iTunes can recognize MP4 videos, well, only in the condition of compressing with the supported codec like MPEG-4 or H.264. Namely, iTunes has nothing to do with those MP4 files with the unmatched codec. So for the question up lines, it may be due to the codec problem. This is not a tough problem to work out, actually. Only a professional MP4 to iTunes Mac program needed. And the article here shows you how to fix this with an excellent iSkysoft Video Converter for Mac step by step.
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Easy Steps to Convert MP4 to iTunes on Mac with iSkysoft Video Converter
There are 3 ways to add files: 1 - drag & drop MP4 files to the MP4 to iTunes Mac program. 2 - go to "File > Load Media Files" to locate files in the resulting dialog. 3 - It's easier to find and import media files from the built-in Media Browser to the application.
To make your MP4 videos be accessible to iTunes, MOV, M4V is highly recommended, and also you still can choose MP4 as your output format, this Mac converter would automatically set a compatible iTunes codec.
If you are about to play your MP4 videos on iPad, iPhone, iPod etc., just select the output format according to the device name. The converted media files will be added to iTunes automatically. iMovie, Final Cut Pro and iDVD presets are supplied, too.
Click the "Convert" button and let the excellent Mac Video Converter automatically do the rest for you.