GopStructure

Picolo

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Description

Type	Enumerated
Description	Control of the GOP (groups of pictures) structure
"Set" effect	Sets the GOP structure
"Get" effect	Returns the currently selected GOP structure

Classification

Class	Channel
Category	Compression
Level	Expert

Identifiers

String	GopStructure
C, C++	MC_GopStructure
.NET	MC.GopStructure
Numerical	4151

This parameter is available only for compressed streams (i.e. if CompressionType is not equal to NONE).

Possible values

Name	Identifier	Description
IONLY	MC_GopStructure_IONLY	I-frames only.
IPONLY	MC_GopStructure_IPONLY	I-frames and P-frames.
IPB	MC_GopStructure_IPB	I-frames, P-frames and B-frames.

Applicability

CompressionType	Allowed values for GopStructure
DX50	IONLY IPONLY IPB
MP4S	IONLY IPONLY
NONE	—

Setting this parameter defines the structure of MPEG-4 streams produced by Picolo Diligent.

When this parameter is set to IONLY, every frame in the stream is an I-frame (Intra-frame).

When this parameter is set to IPONLY, the stream is composed of groups of pictures (GOP). Each GOP starts with one I-frame and is followed by one or several P-frames (Predicted-frames).

When this parameter is set to IPB, the stream is composed of groups of pictures (GOP). Each GOP starts with one I-frame and is followed by several P-frames and B-frames (Bi-directional-frames).