VBrick Systems MPEG-2 用户手册

Configuration

STB Admin Guide

13

RTSP Streaming

MPEG-4 streams in Local-Fullscreen mode only. Choose the protocol 
for RTSP streaming. If the source is a video-on-demand server, you must 
choose UDP.

• UDP – MPEG-4 RTSP streams will be sent over UDP.
• Interleaved (TCP) – MPEG-4 RTSP streams will be sent over TCP 

on the RTSP port. (Also called "RTSP Interleaved".)

• Automatic – An attempt will be made to play the stream over UDP. 

If this fails, TCP will be used.

Data Buffering 
Seconds

MPEG-4 only. This setting will allow more data to be saved before it is 
displayed. This can be used in networks where there is a high amount 
of delay variation or congestion in the network backbone, and will 
'smooth out' video when the network has not been optimized. This 
parameter should generally be left at the default value.

Buffer Check for 
Underflow.

If checked yes, a periodic check for buffer underflow will be made 
using the value in 

 as a cutoff. Setting 

a small value for Lowest Bitrate may result in disruption to low bitrate 
MPEG-4 streams. This parameter should generally be left at the 
default value.

Lowest Bitrate for
Buffer Check

If 

 is set to yes, and if video stream has bitrate greater 

than the value, a periodic check for underflow for MPEG-4 streams 
will be made. This parameter should generally be left at the default 
value.

Audio and Video
Data Ports

Audio, Video, and CC Data Port settings default to 6970, 6972, and 
6974 respectively. These are used to determine receive ports for data. 
This will affect MPEG4 streams requested via RTSP. This will be used 
only for MPEG-4 streams. The range is from 0 to 65534. The data 
port must always be an even number.

RTP Data Port

Set the data port number to use for RTP data. Default = 6970. 0 is 
random. This will be used only for MPEG-1 and MPEG-2 streams 
served by the VoD server. The range is from 0 to 65535.