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Configuring the Sender Chapter 6

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] I

I-frames only

] IP

an I-frame followed by several P-frames

] IPB

an I-frame followed by several substructure sequences, each consisting of a

P-frame and a B-frame

] IPBB

an I-Frame followed by several substructure sequences, each consisting of a

P-frame and two B-frames

GOP length:

Enter the image interval between I-frames here. The value will depend on the

GOP structure selected. It must always be a multiple of the P- frames and B-

frames in the GOP structure.

In the context of the GOP structure IPB, a length of 4 means that an I-frame is

followed by a total of four other frames, which are alternately P- and B-frames.

The resultant image structure is: IPBPBIPBPBIPBPB …

The GOP structure IP can have any GOP length. The IPB structure must have a

GOP length that is a multiple of two. The IPBB structure has length that is a

multiple of three. The GOP structure I requires no GOP length.

Video stream type:

You can choose between the types VES (Video Elementary Stream) and PRG

(Program Stream). Select PRG if audio is to be transmitted together with the

video images in one data stream. Audio signals require an additional bandwidth

of about 256 kBit/s.

Note

If you need talking to the sender site in addition to hearing it you have to

enable audio on the Audio stream page (see page 49). Thus audio signals

will be G.711-coded and sent as a separate data stream.

Video resolution:

Select the desired resolution for the MPEG-2 video image. The following options

are available:

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