Axis 2191 audio (G.721) question

jtodd
jtodd
edited November 2014 in SecuritySpy
I've got an older Axis 2400+ with four (terrible) Swann cameras hitched to it. I just found an option on the 2400+ that I'd never seen before - there is the ability to hook an "Axis 2191" device to it via RS-232 which will support bi-directional audio. I specified on the 2400+ that it should use COM2 as a connection to a 2191, and lo! my SecuritySpy main camera list now shows audio icons beside those four cameras.

HOWever... I don't have the 2191 yet, and I'm not sure what codec list SecuritySpy supports. According to the docs, it's G.721 ADPCM. I think I've only ever seen G.711 supported on SecuritySpy but Google and the docs don't say anything about G.721 support. Before I buy one of these little widgets, can anyone say if they've had success with it, or Ben, does SS work with G.721?

JT

Comments

  • Ben
    Ben
    Hi JT,

    Yes, SecuritySpy supports G.721, as well as G.711, G.723, G.726, PCM, AMR and AAC. I haven't heard of this particular device being tested with SecuritySpy but I would be surprised if it didn't work - basically everything Axis works with SecuritySpy!

    However as far as I can tell this will only give you a single audio input, rather than 4 separate audio inputs, so as long as this is what you want then I would say it's a safe purchase.

    Hope this helps. Please report back and let us know your experiences.
  • jtodd
    jtodd
    No luck so far. I'll do a packet capture and put a link up in a few days.
  • Ben
    Ben
    edited December 2014
    Hi JT,

    If there's a problem with this I'm confident that we'll be able to get it working for you. If you can email us SecuritySpy's log file, this will give us some clues (you'll find it in ~/Documents/SecuritySpy/).
  • jtodd
    jtodd
    No luck on the logfile - I reset it, and restarted SS. It's empty other than complaining about an unrelated camera it can't connect to (powered down.) The Camera Status window shows that there is an audio device connected to one of the four cameras (I specified #1) but the VU meter doesn't budge.

    I can fetch this:

    http://192.168.1.156/axis-cgi/audio/getparam.cgi

    root.Audiod.duplexMode=get
    root.Audiod.maxNumberOfClients=6
    root.Audiod.forwardOnPost=no
    root.Audiod.buttonMode=toggle
    root.Audiod.acousticEcho=yes
    root.Audiod.lineEcho=yes
    root.Audiod.slopeFilter=no
    root.Audiod.noisecancelIOgain=0
    root.Audiod.noisecancelAttenuation=0
    root.Audiod.audioEncoding=G723
    root.Audiod.httpMessageType=singlepart
    root.Audiod.microphoneMode=unmuted
    root.Audiod.speakerMode=unmuted
    root.Audiod.forceMicrophoneMode=no
    root.Audiod.forceSpeakerMode=no
    root.Audiod.bufferLevel=3
    root.Audiod.forceBufferLevel=yes
    root.Audiod.connectedClients = 0
    root.Audiod.connectedPostClients = 0


    ...but attaching to http://192.168.1.156/axis-cgi/audio/receive.cgi gives me nothing, and connecting to http://192.168.1.156/axis-cgi/audio/receive.cgi?httptype=singlepart&camera=1 (which is what SS requests, according to packet traces) results in nothing as well. From a browser connection, it just sits - no return.

    I fired up MSIE on a VM and installed the plug-in to see what was what. Unhappily, there was no audio from that method either, so I'm thinking there is something wrong with the audio device somehow. I have the internal microphone selected, so there should at least be a hum or static.

  • Ben
    Ben
    This is a bit perplexing. Yes SecuritySpy does use the axis-cgi/audio/receive.cgi request - if the server isn't returning a "not found" error then it must understand the request. So if it's just not returning any data then this may indicate a problem with the server or audio module. Have you managed to get any sort of audio stream with any of the HTTP requests you've tried?

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