QVidium QVAM140-ARQ - Manual (Page 5)

User’s Manual v.2 QVidium
®
QVARQ A140
5 of 13 - Copyright 2011 QVidium
®
Technologies, Inc.
2
Receive Proxy
2.1 Receive Proxy Overview
QVidium has created a special version of its patented QVARQ RX Proxy Error Correction software
for the Amino A140 Set-Top Box video decoder, and has added this QVARQ receiver proxy
software, along with a web interface, to the Amino A140 that we sell as Model #QVAM140-ARQ.
This ARQ receive proxy software, when started, runs alongside the default Amino software to
intercept an incoming ARQ packet stream, process the error correction to restore lost packets,
correct the incoming stream timing, restore the correct packet ordering, and then forward the
corrected video data stream to the internal Amino decoder for outputting to your monitor.
The Proxy menu controls the configuration and operation of this QVARQ RX Proxy software. This
section explains how to use the Web pages to configure the receive proxy parameters through three
profile web pages: Network Configuration, ARQ Configuration, and Server Configuration, as
described below and shown in Figures 3 through 6.
2.2 Receive Proxy Network Configuration
Figure 3 shows the Receive Proxy network configuration page. To configure the IP network
parameters, within the Network Parameters section of the proxy profile, set the UDP port and ARQ
port for the incoming stream. The proxy receives the video and audio IP streams as RTP/UDP IP
packets. The RTP header adds a timestamp and packet sequence number before inserting the
MPEG-2 transport stream packets into the RTP/UDP/IP packet payload.
The network interface to the receive proxy
includes QVidium’s patented synchronized network jitter
buffering mechanism to help remove the effects of variable network delays. In the receive proxy
network interface. You may specify a delay for this jitter buffer in milliseconds. When processing
and ARQ packet stream, the receive proxy software inserts a jitter buffer that holds the specified
number of milliseconds of packets to give the decoder ample time to account for random delays,
and to allow the decoder to correct packet ordering. The receive proxy uses RTP sequence
numbers of incoming packets to insert incoming packets into their proper place in the de-jitter
buffer before releasing those packets into the receive proxy. The jitter buffer also uses the RTP
timestamp to synchronize the receive proxy
’s network clock with the video source to adjust the
jitter buffer hold time.
In Auto ARQ Mode (selected by default on the ARQ configuration tab), the value you set for the
Jitter Buffer becomes a minimum value, since the receiver proxy software will ping the sender to
automatically determine the network jitter and over-ride the jitter buffer setting to a larger value if
necessary.
The following procedure will help you configure the network portion of the receive proxy:
1. Enter http://IPAddress where IPAddress is the IP address of the Amino 140 SetTop
Box
2. Click on “Profile” under the “Proxy” item from the menu on the left. The “Proxy
Profile
” interface should display in the main area to the right of the menu system, as shown
in Figure 3. NOTE: You can only configure a RX Proxy module that has been registered
with a valid license. If uncertain about the license state, please click on “Register”. To
obtain a license key that you have purchased, please e-mail QVidium at
[email protected]
with the 32-digit license code. Without this code we cannot issue you a license key.