[ios] comment and make source code document

* apple source code comment syntax

https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/HeaderDoc/intro/intro.html

* Doxygen : make doucment

* Headerdoc Tutorial

http://www.raywenderlich.com/66395/documenting-in-xcode-with-headerdoc-tutorial

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[Video] mp4 seek trouble (recover and set progressive download)

To support progressive download like video streaming you should “apply faststart”
Move moov atom to front – ffmpeg, qt-faststart.c

Recover and apply faststart

$ ffmpeg -i broken.mp4 -c:a copy -c:v copy -movflags faststart recover.mp4

* Tools

ffmpeg

AtomicParsely

Bento4