In order to play MP4 files, you must have MP4 Splitter installed. Not to be confused with MPEG-4 Video, the MP4 Bitstream format is a wrapper format, similar to AVI/OGM/Matroska.
It should become more popular as commercial entities start shipping more MPEG-4 content.
How to install MP4 Splitter
If you are unable to install the filter, please read this small guide: How to install/uninstall DLL and AX codec files
Changes in MP4 Splitter 1.4.3
- correct aspect ratio for video tracks, has a higher priority value from the header(atom 'tkhd');
- added support for '2Vuy', 'DVOO', 'yuvs', 'yuv2', DNxHD, FFV1, 'v308', 'v408', 'V410';
- Gabest MP4 Splitter
can't be used with the Haali Media Splitter
installed. So it's not advisable to have both files installed on your system in the same time.
The format was licensed from Apple's QuickTime by the MPEG group as the official file format for MPEG-4 content.