Have downloaded some movies from the Internet with MP4 file formats or captured some MP4 footage with your device recorders and wish to add the MP4 files to iTunes library so that you can easily sync them to your video-enabled iPhone, iPad or Apple TV. However, you may find that you can only add certain MP4 files to iTunes.
Why iTunes won't add MP4 video?
It is well known that MP4 is a multimedia container format, it can be encoded with various different video codec. However, iTunes only supports to play MPEG-4 movies that end with the file extension of .mov, .mp4 and .m4v. If the MP4 files that you try to import to iTunes are encoded with other incompatible video codec such as H.265/HEVC, MPEG-1, MPEG-2, WMV/VC-1, VP8, VP9, MVC, Theora, etc, iTunes will fail to open them.
To fix this codec incompatible issue, you can use a video conversion program such as Pavtube Video Converter (best video converter review) to transcode unsupported MP4 to iTunes playable MPEG-4 format. Sometimes, even if you have got iTunes playable MP4 format with the right video or audio codec, you may still fail to sync the MP4 video from iTunes to iPhone, iPad or Apple TV if the MP4 video does not meet the technical specification standards such as video/audio codec, aspect ratio, bit rate, frame rate, resolution, etc for those iOS devices. No need to worry, you can easily fix it by tweak those settings in the program's profile settings window to make them adapt with your iOS devices.
Besides converting MP4 to iTunes, the program can also do you a great favor to convert other unsupported file formats such as AVI, WMV, FLV, MPEG-1, MPEG-2, MKV, H.265, etc for adding into iTunes library.
How to Convert Unsupported MP4 for Adding to iTunes library?
Step 1: Add MP4 files into the program.
Run the program on your computer and click "File" > "Add Video/Audio" or "Add from folder" to add MP4 files into the program.
Step 2: Specify output profile format.
Click "Format" bar drop-down list, choose iTunes best supported "M4V - MPEG-4 Video(*.m4v)" under "Common Video" main category.
If you wish to sync converted files to from iTunes to iPad/iPhone/Apple TV, just output iPhone/iPad/Apple TV preset profile formats, which will ensure a successfully iTunes to iOS device syncing process.
Step 3:Adjust output profile parameters.
To get better output video and audio quality, you can adjust the output video codec, bit rate, frame rate, resolution and audio codec, bit rate, sample rate and channels in the program's profile settings window.
Step 4: Start MP4 to iTunes conversion process.
After all the settings is completed, hit right-bottom "Convert" button to start to convert MP4 to iTunes supported file formats and settings conversion process.
When the conversion is completed, hit the "Open Output Folder" on the main interface to pop out the folder with the converted files. Then feel free to add and play MP4 files on iTunes or sync MP4 files from iTunes to iPad/iPhone/Apple TV.