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IPNC 5.0 - DM365, two streams, why?

Hi,

I am using IPNC 5.0, I have enabled AV server debugging

Below is my debug log,

./av_server.out DM365 NTSC APPRO2A AEWB 720P MPEG4 4000000 VBR AUTO MENUOFF &
 AVSERVER API: Sending START.
 AVSERVER MAIN: Recevied CMD = 0x0400, state = 0x0000
 AVSERVER MAIN: AVSERVER_tskConnectInit() ...
 AVSERVER MAIN: Create captureTsk ...
 CAPTURE: Recevied CMD = 0x0300
 CAPTURE: Create...
 CAPTURE: Opening capture on imager MICRON_MT9P031_5MP.
SENSOR FPS VALUE = 30
 CAPTURE: Create...DONE
 AVSERVER MAIN: Create encodeTsk ...
 AVSERVER MAIN: Create streamTsk ...
 STREAM: Recevied CMD = 0x0300
 STREAM: Create...
 STREAM: Ext 0: 0x0
 STREAM: Ext 1: 0x0
queue id:131076
 STREAM: Create...DONE
 AVSERVER MAIN: Create fdTsk ...

 FR : 0 users registered from exsiting face album
 AVSERVER MAIN: Create displayTsk ...
 AVSERVER MAIN: Create aewbTsk ...
IPNC_DM365_5.0.0 (root@ubuntu) (gcc version 4.3.3 (GCC) ) #1 PREEMPT Mon Apr 2
IPNC AUTO_IRIS = 1
 AVSERVER MAIN: Create audioPlayTsk ...
 AVSERVER MAIN: Create motionTsk ...
 AVSERVER MAIN: Create swosdTsk ...
 AVSERVER MAIN: Allocing Buffers ...
 AVSERVER MAIN: Allocating buffers ...
 AVSERVER MAIN: Stream 0: Allocating LDC buffers: 0 of size 1413248 bytes
 AVSERVER MAIN: Stream 0: Allocating VNF buffers: 0 of size 1413248 bytes
 AVSERVER MAIN: Stream 0: Allocating Encode IN buffers: 3 of size 1413248 bytes
 AVSERVER MAIN: Stream 0: Assigning Resize IN buffers: 0 of size 1413248 bytes
 AVSERVER MAIN: Stream 0: Getting Capture OUT buffers
 AVSERVER MAIN: Stream 0: Capture OUT buffers 0
 AVSERVER MAIN: Stream 0: Capture OUT buffers 1
 AVSERVER MAIN: Stream 0: Capture OUT buffers 2
 AVSERVER MAIN: Stream 1: Allocating LDC buffers: 0 of size 92288 bytes
 AVSERVER MAIN: Stream 1: Allocating VNF buffers: 0 of size 92288 bytes
 AVSERVER MAIN: Stream 1: Allocating Encode IN buffers: 3 of size 92288 bytes
 AVSERVER MAIN: Stream 1: Assigning Resize IN buffers: 0 of size 92288 bytes
 AVSERVER MAIN: Stream 1: Getting Capture OUT buffers
 AVSERVER MAIN: Stream 1: Capture OUT buffers 0
 AVSERVER MAIN: Stream 1: Capture OUT buffers 1
 AVSERVER MAIN: Stream 1: Capture OUT buffers 2

As displayed in debug log it is showing two streams. stream 0 and stream 1. Why two streams needed? Is it really required or its bug?