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Welcome to the gpac wiki! Welcome to the gpac wiki! How to find and use MP4Box on a Mac For a Mac, the GPAC installer is a .dmg file, in which there is a file called Osmo4.app. To install it, simply drop Osmo4.app into the /Applications directory. You can then run Osmo4 easily by clicking on the icon. Unfortunately, to run MP4Box the procedure is less friendly:

The MP4Box executable is located at:

/Applications/Osmo4.app/Contents/MacOS/MP4Box

In a terminal, you can invoke it like any other executable.

$ /Applications/Osmo4.app/Contents/MacOS/MP4Box -add file.avi file.mp4