title: gst-launch bogus 'no element "udpsrc"' error
body: <p>The command: <em>gst-launch udpsrc port=5000</em>
  returns: <em>ERROR: pipeline could not be constructed: no element "udpsrc"</em>.</p>
  
  <p>The command: <em>gst-launch-1.0 udpsrc uri=udp://239.194.0.177:1026</em> does not, and executes (presumably) correctly.</p>
  
  <p>The first command is from many streaming tutorials, e.g. <a href="http://www.wumpus-cave.net/2015/11/06/low-latency-fpv-streaming-with-the-raspberry-pi/" rel="nofollow noreferrer">this one</a>.<br>
  The second command was taken from <a href="https://stackoverflow.com/q/39538695">here</a>. it's just to show that udpsrc is present.<br>
  They were cut down to just the offending part.</p>
  
  <p>I have everything gstreamer1.0 - related up-to-date (for Ubuntu 16.04.6):</p>
  
  <pre><code>gstreamer1.0-clutter-3.0 is already the newest version (3.0.18-1).
  gstreamer1.0-clutter is already the newest version (2.0.18-1).
  gstreamer1.0-crystalhd is already the newest version (1:0.0~git20110715.fdd2f19-11build1).
  gstreamer1.0-dvswitch is already the newest version (0.1.1-1).
  gstreamer1.0-espeak is already the newest version (0.4.0-1).
  gstreamer1.0-fluendo-mp3 is already the newest version (0.10.32.debian-1).
  gstreamer1.0-nice is already the newest version (0.1.13-0ubuntu2).
  gstreamer1.0-pocketsphinx is already the newest version (0.8.0+real5prealpha-1ubuntu2).
  gstreamer1.0-alsa is already the newest version (1.8.3-1ubuntu0.3).
  gstreamer1.0-doc is already the newest version (1.8.3-1~ubuntu0.1).
  gstreamer1.0-plugins-base is already the newest version (1.8.3-1ubuntu0.3).
  gstreamer1.0-plugins-base-apps is already the newest version (1.8.3-1ubuntu0.3).
  gstreamer1.0-plugins-base-dbg is already the newest version (1.8.3-1ubuntu0.3).
  gstreamer1.0-plugins-base-doc is already the newest version (1.8.3-1ubuntu0.3).
  gstreamer1.0-plugins-good is already the newest version (1.8.3-1ubuntu0.4).
  gstreamer1.0-plugins-good-dbg is already the newest version (1.8.3-1ubuntu0.4).
  gstreamer1.0-plugins-good-doc is already the newest version (1.8.3-1ubuntu0.4).
  gstreamer1.0-pulseaudio is already the newest version (1.8.3-1ubuntu0.4).
  gstreamer1.0-tools is already the newest version (1.8.3-1~ubuntu0.1).
  gstreamer1.0-x is already the newest version (1.8.3-1ubuntu0.3).
  libgstreamer1.0-0 is already the newest version (1.8.3-1~ubuntu0.1).
  libgstreamer1.0-0-dbg is already the newest version (1.8.3-1~ubuntu0.1).
  libgstreamer1.0-dev is already the newest version (1.8.3-1~ubuntu0.1).
  gstreamer1.0-libav is already the newest version (1.8.3-1ubuntu0.2).
  gstreamer1.0-libav-dbg is already the newest version (1.8.3-1ubuntu0.2).
  gstreamer1.0-packagekit is already the newest version (0.8.17-4ubuntu6~gcc5.4ubuntu1.4).
  gstreamer1.0-plugins-bad is already the newest version (1.8.3-1ubuntu0.2).
  gstreamer1.0-plugins-bad-dbg is already the newest version (1.8.3-1ubuntu0.2).
  gstreamer1.0-plugins-bad-doc is already the newest version (1.8.3-1ubuntu0.2).
  gstreamer1.0-plugins-bad-faad is already the newest version (1.8.3-1ubuntu0.2).
  gstreamer1.0-plugins-bad-videoparsers is already the newest version (1.8.3-1ubuntu0.2).
  gstreamer1.0-plugins-ugly is already the newest version (1.8.3-1ubuntu0.1).
  gstreamer1.0-plugins-ugly-amr is already the newest version (1.8.3-1ubuntu0.1).
  gstreamer1.0-plugins-ugly-dbg is already the newest version (1.8.3-1ubuntu0.1).
  gstreamer1.0-plugins-ugly-doc is already the newest version (1.8.3-1ubuntu0.1).
  gstreamer1.0-vaapi is already the newest version (1.8.3-1~ubuntu0.1).
  gstreamer1.0-vaapi-doc is already the newest version (1.8.3-1~ubuntu0.1).
  gstreamer1.0-hybris:i386 is already the newest version (1.8.3-1ubuntu0.2).
  
  
  
  $ gst-inspect-1.0 udpsrc
  Factory Details:
    Rank                     none (0)
    Long-name                UDP packet receiver
    Klass                    Source/Network
    Description              Receive data over the network via UDP
    Author                   Wim Taymans &lt;wim@fluendo.com&gt;, Thijs Vermeir &lt;thijs.vermeir@barco.com&gt;
  
  Plugin Details:
    Name                     udp
    Description              transfer data via UDP
    Filename                 /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstudp.so
    Version                  1.8.3
    License                  LGPL
    Source module            gst-plugins-good
    Source release date      2016-08-19
    Binary package           GStreamer Good Plugins (Ubuntu)
    Origin URL               https://launchpad.net/distros/ubuntu/+source/gst-plugins-good1.0
  
  GObject
   +----GInitiallyUnowned
         +----GstObject
               +----GstElement
                     +----GstBaseSrc
                           +----GstPushSrc
                                 +----GstUDPSrc
  
  Implemented Interfaces:
    GstURIHandler
  
  Pad Templates:
    SRC template: 'src'
      Availability: Always
      Capabilities:
        ANY
  
  
  Element Flags:
    no flags set
  
  Element Implementation:
    Has change_state() function: 0x7f38aa386e10
  
  Element has no clocking capabilities.
  
  URI handling capabilities:
    Element can act as source.
    Supported URI protocols:
      udp
  
  Pads:
    SRC: 'src'
      Pad Template: 'src'
  
  Element Properties:
    name                : The name of the object
                          flags: readable, writable
                          String. Default: "udpsrc0"
    parent              : The parent of the object
                          flags: readable, writable
                          Object of type "GstObject"
    blocksize           : Size in bytes to read per buffer (-1 = default)
                          flags: readable, writable
                          Unsigned Integer. Range: 0 - 4294967295 Default: 4096 
    num-buffers         : Number of buffers to output before sending EOS (-1 = unlimited)
                          flags: readable, writable
                          Integer. Range: -1 - 2147483647 Default: -1 
    typefind            : Run typefind before negotiating
                          flags: readable, writable
                          Boolean. Default: false
    do-timestamp        : Apply current stream time to buffers
                          flags: readable, writable
                          Boolean. Default: true
    port                : The port to receive the packets from, 0=allocate
                          flags: readable, writable
                          Integer. Range: 0 - 65535 Default: 5004 
    multicast-group     : The Address of multicast group to join. (DEPRECATED: Use address property instead)
                          flags: readable, writable, deprecated
                          String. Default: "0.0.0.0"
    multicast-iface     : The network interface on which to join the multicast group
                          flags: readable, writable
                          String. Default: null
    uri                 : URI in the form of udp://multicast_group:port
                          flags: readable, writable
                          String. Default: "udp://0.0.0.0:5004"
    caps                : The caps of the source pad
                          flags: readable, writable
                          Caps (NULL)
    socket              : Socket to use for UDP reception. (NULL == allocate)
                          flags: readable, writable
                          Object of type "GSocket"
    buffer-size         : Size of the kernel receive buffer in bytes, 0=default
                          flags: readable, writable
                          Integer. Range: 0 - 2147483647 Default: 0 
    timeout             : Post a message after timeout nanoseconds (0 = disabled)
                          flags: readable, writable
                          Unsigned Integer64. Range: 0 - 18446744073709551615 Default: 0 
    skip-first-bytes    : number of bytes to skip for each udp packet
                          flags: readable, writable
                          Integer. Range: 0 - 2147483647 Default: 0 
    close-socket        : Close socket if passed as property on state change
                          flags: readable, writable
                          Boolean. Default: true
    used-socket         : Socket currently in use for UDP reception. (NULL = no socket)
                          flags: readable
                          Object of type "GSocket"
    auto-multicast      : Automatically join/leave multicast groups
                          flags: readable, writable
                          Boolean. Default: true
    reuse               : Enable reuse of the port
                          flags: readable, writable
                          Boolean. Default: true
    address             : Address to receive packets for. This is equivalent to the multicast-group property for now
                          flags: readable, writable
                          String. Default: "0.0.0.0"
    loop                : Used for setting the multicast loop parameter. TRUE = enable, FALSE = disable
                          flags: readable, writable
                          Boolean. Default: true
  </code></pre>
  
  <p>What the hell?<br>
  Or, if it's "unclear what I'm asking": what do I need to do / reorder / adjust / reconfigure / recompile / etc to receive a stream coming in at port 5000? Most examples I've seen start with "gst-launch udpsrc port=...".</p>