[pablochen2]

For J2ME midlet, We know some mobile support video/3gp but some not, what's the reason behind?
some people say: you need MMAPI for J2ME to play video, but it depends on the manufacture. if you don't have it, you can't install it later on.

My question is: why can't install it later on? which layer is the MMAPI located according to below hierarchy?
Optional Packages(1)
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Profiles(MIDP)(2)
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Configuration(CDC)(3)
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Java Virtual Machine(4)
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Host Operating System(5)

[bogdan.galiceanu]

According to this MMAPI is an optional package.

It often happens that a MIDlet cannot handle all the file formats that the phone is said to be able to handle.