Clip Information File

Type of format	Data format
First released	2006
Developer	Blu-ray Disc Association
Filename extension	xxxxx.clpi
Limits	4,000 Clip files allowed
Open Format?	Yes
Free Format?	?
Magic Number	HDMV0200 (BD) HDMV0300 (UHD-BD)

 Clip Information files contain descriptive details and purpose for each M2TS AV stream, like type, sequence, program, and timing that communicates to each stream.

The files use the same 5-digit number as the M2TS AV stream files. A combination of each M2TS AV stream and its associated Clip Information File is called a "Clip." Clip Information is located in the xxxxx.clpi file under the CLIPINF directory and is written in binary. Only 4,000 Clip files are allowed. Its magic number is HDMV0100 and HDMV0200. For Ultra HD Blu-ray, its magic number is HDMV0300.

Each Clip file contains program info of what's inside a M2TS file, such as video, audio, and graphics. Audio and Graphics streams provide info of what frequency, channels, and languages it supports. Languages are defined in ISO 639-2/T. 

Showing program information

It also provides details System Time Clock (STC) sequences. An STC-sequence is a sequence of source packets in which the STC is continuous. The STC is the System Time Clock defined by the PCR (Program Clock Reference) in the Transport Stream. 

Showing sequence info

 It also contains Characteristic Point Information (CPI). The CPI contains information to convert a presentation time (PTS) to a source packet number (SPN) in the AV Clip, and vice versa. It is used for random access, trick modes, and seamless connection. CPI also shows the EP_map, which consists of coarse entries and fine entries to enable fast access to the AV stream .Coarse entries provide approximate locations (every few seconds). Fine entries provide precise locations (every GOP/I-frame).

Showing Characteristic Point Information (CPI)

Sources

• Blu-ray Disc Read-Only Format – Part 3
  
  
  

Author(s) : Æ Firestone