QVidium QVSD - Manual (Page 10)

User‟s Manual v.3 QVidium
®
QVSD H.264 SD Video Codec™
Copyright 2011 QVidium
®
Technologies, Inc.Page 10 of 53
2
Encoder Configuration
The encoder is configured and operated from a web browser. This section explains how to configure
the Codec
‟s encoding parameters.
2.1 Configuring the Encoder - Overview
1. Enter http://<IPAddress> where <IPAddress> is the IP address of the QVidium QVSD
H.264 SD Video Codec™ that you want to configure. (The default address is
http://192.168.1.23.)
2.
Click on “Profile” under “Encoder” from the menu on the left. “The Encoder Profile”
interface should display in the main area to the right of the menu system, as shown in
Figure 1.
3. Enter the destination IP address and UDP port number for the decoder, media server, or
network equipment that will be receiving the stream. Enter the desired Video Bit Rate (in bps),
and modify the other audio and video parameters, such as Video Input, and Audio Bitrate (in
Kbps), to suit your needs, as shown in Figure 1a, and explained below.
4. Press the
“Save” button to save your changes. None of your changes will be saved nor have
any effect unless you first save them. If you have any doubt about the parameters selected
when running the encoder, you should click on Profile after saving the parameters or starting
the coder to see the current operational encoder settings.
2.2 Basic Encoding Configuration
As shown in Figure 1a, you can select the video input source, and set the video and audio
encoding format and bitrates. For the QVSD codec, the Video Input can be either Composite or S-
Video. The QVSD codec will automatically detect and adjust for the input video resolution and
format (PAL vs. NTSC vs. SECAM). You can also use the advanced encoding parameters (Section
2.4) to scale the video resolution and frame-rate.
The QVSD can output the encoded video stream either as a Variable Bit Rate (VBR) IP stream, or
(in a forthcoming firmware release) a Constant Bit Rate (CBR) IP stream. When CBR mode is
supported, enter the total desired output bitrate, including audio and video feeds, as the Stream
Bit Rate. In this mode, it will ignore the Video Bit Rate parameter. At present, this mode is not
functional.
For VBR mode, enter the desired peak video encoding bit rate in bits per second as the Video Bit
Rate parameter. A VBR stream optimizes IP network efficiency by eliminating unnecessary null
packets from the media stream. The encoder will use the Video Bit Rate number as an upper limit
on video data bursts. In general, the video rate may be less than this rate, depending upon video
content. To calculate the maximum peak IP data rate, you must add to this video bit rate the audio
bitrate plus any transport-stream multiplexing and network packetization overhead (usually
between 5 and 10%).
Note: Be aware that the user interface will not warn you if you try to enter a bit rate beyond the
operating limits of the codec. For more details on the range of MPEG encoding bit rates, please
see Appendix C (Section 12.3). For more information on the various video parameters (Frame