gst-launch bogus 'no element "udpsrc"' error - udp

Question

The command: gst-launch udpsrc port=5000
returns: ERROR: pipeline could not be constructed: no element "udpsrc".
The command: gst-launch-1.0 udpsrc uri=udp://239.194.0.177:1026 does not, and executes (presumably) correctly.
The first command is from many streaming tutorials, e.g. this one.
The second command was taken from here. it's just to show that udpsrc is present.
They were cut down to just the offending part.
I have everything gstreamer1.0 - related up-to-date (for Ubuntu 16.04.6):
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 <wim#fluendo.com>, Thijs Vermeir <thijs.vermeir#barco.com>
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
What the hell?
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=...".

Answer 1

In first command you use gst-launch but in second gst-launch-1.0 - it's the reason of your problem. You should always use gst-launch-1.0. gst-launch is related to GStreamer 0.1

Answer 2

I had this error today as well, but for a different reason. I'm posting this answer just in case anyone else happens to come across it as well.
It turns out I did not have all the development packages for GStreamer installed, specifically gstreamer-1.0-msvc-x86_64-1.16.0.msi (it should be noted this is on my Windows machine). After I installed that, GStreamer was able to locate udpsrc.