NewLogger returns a new Logger instance.

DebugLevel is the lowest level of logging.

ErrorLevel is the highest level of logging.

InfoLevel is the second lowest level of logging.

NoLevel disables all logging.

WarnLevel is the third highest level of logging.

BoxInfo has common infomations of box.

Logger is the logging struct.

Mvhd is ISOBMFF mvhd box type.

IBox is common interface of box.