Gstreamer no element error (lamemp3enc) - streaming

Question

I'm trying to use gstreamer at odroid C1+.
I installed gstreamer, base, good, ugly, bad, libav getting from here
https://gstreamer.freedesktop.org/modules/
following here
http://linuxfromscratch.org/blfs/view/svn/index.html
But when I run like this
gst-launch-1.0 -e pulsesrc device="alsa_input.usb-046d_0809_52A63768-02.analog-mono" ! audioconvert ! lamemp3enc target=1 bitrate=64 cbr=true ! filesink location=audio.mp3
I get error
WARNING: erroneous pipeline: no element "lamemp3enc"
How should I do?
++
I run
GST_PLUGIN_PATH=/usr/lib/gstreamer-1.0/ gst-inspect-1.0 lamemp3enc
and get
Factory Details:
Rank primary (256)
Long-name L.A.M.E. mp3 encoder
Klass Codec/Encoder/Audio
Description High-quality free MP3 encoder
Author Sebastian Dröge <sebastian.droege#collabora.co.uk>
Plugin Details:
Name lame
Description Encode MP3s with LAME
Filename /usr/lib/gstreamer-1.0/libgstlame.so
Version 1.8.1
License LGPL
Source module gst-plugins-ugly
Source release date 2016-04-20
Binary package GStreamer Ugly Plugins 1.8.1 BLFS
Origin URL http://www.linuxfromscratch.org/blfs/view/svn/
GObject
+----GInitiallyUnowned
+----GstObject
+----GstElement
+----GstAudioEncoder
+----GstLameMP3Enc
Implemented Interfaces:
GstPreset
Pad Templates:
SINK template: 'sink'
Availability: Always
Capabilities:
audio/x-raw
format: S16LE
layout: interleaved
rate: { 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000 }
channels: 1
audio/x-raw
format: S16LE
layout: interleaved
rate: { 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000 }
channels: 2
channel-mask: 0x0000000000000003
SRC template: 'src'
Availability: Always
Capabilities:
audio/mpeg
mpegversion: 1
layer: 3
rate: { 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000 }
channels: [ 1, 2 ]
Element Flags:
no flags set
Element Implementation:
Has change_state() function: gst_audio_encoder_change_state
Element has no clocking capabilities.
Element has no URI handling capabilities.
Pads:
SINK: 'sink'
Pad Template: 'sink'
SRC: 'src'
Pad Template: 'src'
Element Properties:
name : The name of the object
flags: readable, writable
String. Default: "lamemp3enc0"
parent : The parent of the object
flags: readable, writable
Object of type "GstObject"
perfect-timestamp : Favour perfect timestamps over tracking upstream timestamps
flags: readable, writable
Boolean. Default: false
mark-granule : Apply granule semantics to buffer metadata (implies perfect-timestamp)
flags: readable
Boolean. Default: false
hard-resync : Perform clipping and sample flushing upon discontinuity
flags: readable, writable
Boolean. Default: false
tolerance : Consider discontinuity if timestamp jitter/imperfection exceeds tolerance (ns)
flags: readable, writable
Integer64. Range: 0 - 9223372036854775807 Default: 40000000
target : Optimize for quality or bitrate
flags: readable, writable
Enum "GstLameMP3EncTarget" Default: 0, "quality"
(0): quality - Quality
(1): bitrate - Bitrate
bitrate : Bitrate in kbit/sec (Only valid if target is bitrate, for CBR one of 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256 or 320)
flags: readable, writable
Integer. Range: 8 - 320 Default: 128
cbr : Enforce constant bitrate encoding (Only valid if target is bitrate)
flags: readable, writable
Boolean. Default: false
quality : VBR Quality from 0 to 10, 0 being the best (Only valid if target is quality)
flags: readable, writable
Float. Range: 0 - 9.999 Default: 4
encoding-engine-quality: Quality/speed of the encoding engine, this does not affect the bitrate!
flags: readable, writable
Enum "GstLameMP3EncEncodingEngineQuality" Default: 1, "standard"
(0): fast - Fast
(1): standard - Standard
(2): high - High
mono : Enforce mono encoding
flags: readable, writable
Boolean. Default: false
Presets:
"Ubuntu"

Answer 1

what OS are you running on odroid (Android/Ubuntu?) what gives gst-inspect-1.0 lamemp3enc.. there is library path .. you can ldd it:
ldd /usr/local/lib/gstreamer-1.0/libgstlame.so
linux-vdso.so.1 => (0x00007ffc7dbed000)
libgstaudio-1.0.so.0 => /usr/local/lib/libgstaudio-1.0.so.0 (0x00007f4a97faa000)
libgstbase-1.0.so.0 => /usr/local/lib/libgstbase-1.0.so.0 (0x00007f4a97d4c000)
libgstreamer-1.0.so.0 => /usr/local/lib/libgstreamer-1.0.so.0 (0x00007f4a97a31000)
libgobject-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007f4a977e0000)
libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f4a974d8000)
libmp3lame.so.0 => /usr/lib/x86_64-linux-gnu/libmp3lame.so.0 (0x00007f4a9724a000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f4a9702c000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4a96c67000)
libgsttag-1.0.so.0 => /usr/local/lib/libgsttag-1.0.so.0 (0x00007f4a96a2d000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4a96727000)
liborc-0.4.so.0 => /usr/local/lib/liborc-0.4.so.0 (0x00007f4a964a4000)
libgmodule-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0 (0x00007f4a9629f000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f4a96097000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f4a95e93000)
libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007f4a95c8a000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f4a95a4c000)
/lib64/ld-linux-x86-64.so.2 (0x0000558c95a32000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f4a95833000)
Check if you have all libs .. you need especially libmp3lame.so ..
You can always use apt-file tool to check which package provides this lib.. but its quite apparent that its this package (run as root or sudo):
apt-get install libmp3lame-dev
If you did not have it at compile time (I guess you compiled as you linked linuxfromscratch..) you need to recomiple gst-plugins-ugly after installing this lib..
Then check the last part at when you rerun configure at ugly (I would suggest using autogen.sh instead.. but I dont know your environment..) which should mention if you will have mp3 builded..
UPDATE
So you just need to set the env variable GST_PLUGIN_PATH. Gstreamer just haven't known where to look for the gstreamer mp3 plugin..
you can export the env variable.. say in ~/.basrhc:
export GST_PLUGIN_PATH=/usr/lib/gstreamer-1.0/
and then just the same pipe will work perfectly, this is simpler one (tested, works):
gst-launch-1.0 -e audiotestsrc ! audioconvert ! lamemp3enc ! filesink location=audio.mp3
HTH