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Thread: RTSP via UDP

  1. #1
    Join Date
    Apr 2013

    Default RTSP via UDP


    I'm running Wowza Media Server 3.6.4 on a small EC2 instance.

    I'm not able to stream videos via RTSP over UDP:
    - connecting with VLC (Win7 PC) takes about 10 seconds and then switches to RTSP over TCP (audio & video ok)
    - connecting QT Player (Win7 PC) takes about 10 seconds and then switches to RTSP over TCP (no video, audio ok)
    - Android 1.x phones dont play the video, e.g. LG GT540
    - missing audio problems

    when I installed the server on a local machine and try to stream the same video there are no problems:
    - VLC starts playing within 1-2 sec.
    - Android 1.x phones playback works
    - no missing audio problems

    I've been working on this for a year now, read and followed _every guide_ on about EC2 & ports etc. available.

    only error message I could find (extra rstp debugging is turned on):

    WARN server comment 2014-01-17 22:44:02 1.314 RTPUDPTransport.bind[qr/_definst_]: Failure to bind to address[/]: java.lang.NullPointerException: address

    since it must have to do with the EC2 machine having a private ip address I tried many different settings for these parameters in the Application config:

    I'm now asking for some feedback please, does anyone actually stream via RTSP over UDP from an Amazon EC2 Wowza installation?

    EDIT 1:
    here is an example stream on the EC2 instance. depending on the port I'm using I'm getting different results with VLC:
    rtsp:// pomm2.mp4 (10 sec delay, audio & video ok)
    rtsp:// pomm2.mp4 (no delay, no audio)
    rtsp:// pomm2.mp4 (10 sec delay, audo & video ok)

    thank you,
    Last edited by luvolondon; 01-18-2014 at 06:59 AM.

  2. #2


    This sounds like UDP ports are not open on the server and/or, not mapped properly in your network.

    Take a look at this guide for more information:
    Networking (UDP and TCP setup)
    How to troubleshoot RTSP/RTP playback


  3. #3
    Join Date
    Apr 2013



    thank you for pointing me into the right direction. after more succesful testing with VLC on a PC directly connected to the internet at an ISP's hosting location I found out that it must be my local DSL setup that's causing the problems.

    my DSL connection is via German T-Online and I'm using a Juniper SSG-5 firewall appliance. I looked through the SSG-5 and I can't find a place where the device might block UDP traffic. so I guess it is T-Online that's causing the problems.


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