David Conrad <umovi...@gmail.com> added the comment:

Looks like flash defines a slightly different layout for the chpl box than 
Nero did.

Specifically, it excludes the 4 bytes that noone knows what they're for, 
and defines the containing box to be 'moov' rather than 'udta'. Thus it 
appears to barf when fed with Nero's format.

One addition: they define version to be 0 whereas all the Nero chapters 
I've seen use version 1, so it's possible Nero changed at some point too, 
but e.g. VLC, GPAC, and libmp4v2 read the additional 4 bytes 
unconditionally.

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