how to use avconv to record streaming audio (how to define sources)?

how to use avconv to record streaming audio (how to define sources)?

I have never used avconv before. I've been reading the manual and asking
questions on various forums and IRC for the last couple weeks but I have
not found an answer yet. (This question is one part of a larger question I
asked here. I am breaking it down because this key part is where I need
help first. I may delete the other question because it may be too broad or
ill-defined.)
I used pacmd list-cards to list my streaming audio sources. Below are the
two that I need to define as inputs to avconv.
alsa_output.usb-Focusrite_Scarlett_2i2_USB-00-USB.analog-stereo.monitor/#2:
Monitor of Scarlett 2i2 USB Analog Stereo
alsa_input.usb-Focusrite_Scarlett_2i2_USB-00-USB.analog-stereo/#3:
Scarlett 2i2 USB Analog Stereo
So my question is simply, How do I define those sources as inputs to avconv?
More info/background follows:
Once I know how to define the audio inputs I plan to use them similarly to
this:
#!/bin/bash
OUTPUT="audio_`date +%Y-%m-%d_%H%M`"
avconv \
-f alsa -ac 2 -i
<alsa_output.usb-Focusrite_Scarlett_2i2_USB-00-USB.analog-stereo.monitor>
\
-f alsa -ac 1 -i
<alsa_input.usb-Focusrite_Scarlett_2i2_USB-00-USB.analog-stereo> \
-map 0:0 -map 1:0 \
-acodec flac \
-threads 0 \
-y $OUTPUT
I assume I need to replace what is in angle brackets with the correct
notation. And I have no idea if the rest of the above script is even
close...
Here's my hardware info:
$ pacmd list-cards
Welcome to PulseAudio! Use "help" for usage information.
>>> 3 card(s) available.
[snip other cards]
index: 2
name: <alsa_card.usb-Focusrite_Scarlett_2i2_USB-00-USB>
driver: <module-alsa-card.c>
owner module: 6
properties:
alsa.card = "1"
alsa.card_name = "Scarlett 2i2 USB"
alsa.long_card_name = "Focusrite Scarlett 2i2 USB at
usb-0000:04:00.0-2, high speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:04:00.0-usb-0:2:1.0"
sysfs.path =
"/devices/pci0000:00/0000:00:1c.4/0000:04:00.0/usb3/3-2/3-2:1.0/sound/card1"
udev.id = "usb-Focusrite_Scarlett_2i2_USB-00-USB"
device.bus = "usb"
device.vendor.id = "1235"
device.vendor.name = "Novation EMS"
device.product.id = "8006"
device.product.name = "Scarlett 2i2 USB"
device.serial = "Focusrite_Scarlett_2i2_USB"
device.string = "1"
device.description = "Scarlett 2i2 USB"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-usb"
profiles:
output:analog-stereo: Analog Stereo Output (priority 6000)
output:analog-stereo+input:analog-stereo: Analog Stereo Duplex
(priority 6060)
output:analog-stereo+input:iec958-stereo: Analog Stereo Output +
Digital Stereo (IEC958) Input (priority 6055)
output:iec958-stereo: Digital Stereo (IEC958) Output (priority 5500)
output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958)
Output + Analog Stereo Input (priority 5560)
output:iec958-stereo+input:iec958-stereo: Digital Stereo Duplex
(IEC958) (priority 5555)
input:analog-stereo: Analog Stereo Input (priority 60)
input:iec958-stereo: Digital Stereo (IEC958) Input (priority 55)
off: Off (priority 0)
active profile: <output:analog-stereo+input:analog-stereo>
sinks:
alsa_output.usb-Focusrite_Scarlett_2i2_USB-00-USB.analog-stereo/#1:
Scarlett 2i2 USB Analog Stereo
sources:
alsa_output.usb-Focusrite_Scarlett_2i2_USB-00-USB.analog-stereo.monitor/#2:
Monitor of Scarlett 2i2 USB Analog Stereo
alsa_input.usb-Focusrite_Scarlett_2i2_USB-00-USB.analog-stereo/#3:
Scarlett 2i2 USB Analog Stereo
ports:
analog-output: Analog Output (priority 9900, available: unknown)
properties:
analog-input: Analog Input (priority 10000, available: unknown)
properties:
iec958-stereo-input: iec958-stereo-input (priority 0, available:
unknown)
properties:
iec958-stereo-output: Digital Output (S/PDIF) (priority 0,
available: unknown)
properties: