video - What the Hex is Going on with Milliseconds?

Question

I have the values 88 40 B0 00. They are is hex. I don't understand how, but they represent a number of nanoseconds. I need help with understand this document which outlines Matroska and WebM metadata encoding. I am relatively new to this, but I am using JavaScript to alter a file duration. What I am currently using works, but the goal is to know how to set a custom duration of the WebM video file. The document shows the following for the duration parameters:

• Element Name
  • Duration
• The level within an EBML tree
  • 2
• Element ID displayed as octets
  • 0x4489
• Mandatory
  • False
• May occur multiple times
  • False
• Contained in
  • 1
  • 2
  • 3
  • 4
• Available to use in WebM
  • True
• Description
  • Duration of the Segment in nanoseconds based on TimestampScale

I am using the default time stamp scale (1000000). My question is how to I get those hex values, and turn them into hours:minutes:seconds:milliseconds. I simply am stumped :( 0x8840B000 doesn't help me.

Answer 1

等待大神解答