Unable to add element intervideosink

[brucekim]

Hi there,

I have built the latest source of brave and performed simple test,

• installed: GStreamer 1.14.3, python3.6 and all other preliminaries including libraries.
• simple test pipeline: a video input -> mixer -> output(rtmp)

However it doesn't work at adding input to mixer.
I think 'intersink' has not been created properly.

Does anyone know how t solve it?

debug log

[2021-03-25 13:01:29 +0900] [45497] [INFO] Goin' Fast @ http://0.0.0.0:5000
INFO: [ output1] RTMP output now configured to send to rtmp://[test_rtmpserver_ip_addr]/live/livestream
ERROR: [ input1] Unable to add element intervideosink
ERROR: [ input1] Unable to add element queue
Traceback (most recent call last):
File "brave.py", line 71, in
start_brave()
File "brave.py", line 61, in start_brave
session.start()
File "/home/bkim/git/brave/brave/session.py", line 36, in start
self._setup_initial_inputs_outputs_mixers_and_overlays()
File "/home/bkim/git/brave/brave/session.py", line 89, in _setup_initial_inputs_outputs_mixers_and_overlays
mixer.setup_sources()
File "/home/bkim/git/brave/brave/mixers/mixer.py", line 94, in setup_sources
connection.add_to_mix(details)
File "/home/bkim/git/brave/brave/connections/connection_to_mixer.py", line 47, in add_to_mix
self._ensure_elements_are_created()
File "/home/bkim/git/brave/brave/connections/connection_to_mixer.py", line 186, in _ensure_elements_are_created
self._create_video_elements()
File "/home/bkim/git/brave/brave/connections/connection_to_mixer.py", line 212, in _create_video_elements
intervideosrc, intervideosink = self._create_inter_elements('video')
File "/home/bkim/git/brave/brave/connections/connection.py", line 99, in _create_inter_elements
intersink.set_property('channel', channel_name)
AttributeError: 'NoneType' object has no attribute 'set_property'

yaml configuration

enable_video: true
enable_audio: true

default_mixer_width: 640
default_mixer_height: 360

inputs:
- id: 1
type: test_video
pattern: 18

outputs:
- type: rtmp
uri: rtmp://[test_rtmpserver_ip_addr]/live/livestream
source: mixer1

mixers:
- sources:
- uid: input1
zorder: 2
width: 160
height: 90

[brucekim]

This has been resolved with reinstalling latest gstreamer, 1.19.0, on Ubuntu 20.04.