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Originally Posted by Zero1
Don't worry about it, that particular statement is referring to Nero's chapters. Like their subtitles, Nero do it in what one might describe as a "not strictly supported" way. In other word a hack, like with Nero storing DVD subpictures in MP4, I believe this to be unsupported and the official subtitle format should be 3GPP timed text (aka TTXT).
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Oops, don't get careless now. 3gpp and ttxt are NOT the same thing. 3gpp is the standardized format for mp4 text based subtitle streams. ttxt is an xml format which gpac developed to DESCRIBE 3gpp streams. I.e. ttxt is something only mp4box can parse right now.