RTSP server in Jetson Xavier using the Gst Python library

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
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1

Hi!

I’m trying to create a RSTP server using the Gstreamer Gst Python library in the Jetson Xavier, Jetpack 5.0.1-b118 and Gstreamer 1.16

The server works fine using as h264 encoder the x264enc (in the code, making h264_cpu = True):

import gi
gi.require_version('Gst', '1.0')
gi.require_version('GstRtspServer', '1.0')
from gi.repository import Gst, GLib, GstRtspServer


class VideoServerRTSP:

    def __init__(self, h264_cpu):

        self.loop = self._generate_gst_rtsp_server(h264_cpu)
        self.loop.run()

    def _generate_gst_rtsp_server(self, h264_cpu):

        Gst.init(None)

        if h264_cpu:

            pipeline = f"v4l2src device=/dev/video0 " \
                       f"! videorate ! videoscale " \
                       f"! video/x-raw,width=640,height=480,framerate=30/1 " \
                       f"! videoconvert ! video/x-raw,format=I420 " \
                       f"! x264enc " \
                       f"! rtph264pay name=pay0 pt=96"

        else:

            pipeline = f"v4l2src device=/dev/video0 " \
                       f"! videorate ! videoscale " \
                       f"! video/x-raw,width=640,height=480,framerate=30/1 " \
                       f"! videoconvert " \
                       f"! video/x-raw,format=I420 " \
                       f"! nvvidconv " \
                       f"! 'video/x-raw(memory:NVMM), format=(string)I420' " \
                       f"! nvv4l2h264enc insert-sps-pps=1 idrinterval=15 " \
                       f"! rtph264pay name=pay0 pt=96 --gst-debug=4"

        server = GstRtspServer.RTSPServer.new()
        server.set_service(str('5050'))
        mounts = server.get_mount_points()

        factory = GstRtspServer.RTSPMediaFactory.new()
        factory.set_launch(pipeline)
        factory.set_shared(True)
        mounts.add_factory('/test', factory)

        server.attach()
        loop = GLib.MainLoop()

        return loop


if __name__ == '__main__':

    h264_cpu = True

    server = VideoServerRTSP(h264_cpu)

However, when trying to use the nvv4l2h264enc encoder, the code throws the following error:

(python3.8:14554): GStreamer-CRITICAL **: 15:55:45.663: gst_element_make_from_uri: assertion ‘gst_uri_is_valid (uri)’ failed
(python3.8:14554): GStreamer-CRITICAL **: 15:55:45.705: gst_element_link_pads_filtered: assertion ‘GST_IS_BIN (parent)’ failed
(python3.8:14554): GStreamer-CRITICAL **: 15:55:45.713: gst_element_link_pads_filtered: assertion ‘GST_IS_BIN (parent)’ failed
Opening in BLOCKING MODE

The funny thing is that using the that same piece of pipeline for streaming the video over UDP:

gst-launch-1.0 v4l2src device=/dev/video0 ! videorate ! videoscale ! video/x-raw,width=640,height=480,framerate=30/1 ! videoconvert ! video/x-raw,format=I420 ! nvvidconv ! 'video/x-raw(memory:NVMM), format=(string)I420' ! nvv4l2h264enc insert-sps-pps=1 preset-level=1 ! rtph264pay name=pay0 pt=96 ! udpsink host=127.0.0.1 port=1234

works perfectly.

Any ideas about what is going on?

Thanks in advance!

2

Your issue is using single quotes. These are used with gst-launch command for preventing shell from interpreting the parenthesis, but should not be used in code.

3

Thanks for the answer. Changing the pipeline to:

            pipeline = f'v4l2src device=/dev/video0 ' \
                       f'! videorate ! videoscale ' \
                       f'! video/x-raw,width=640,height=480,framerate=30/1 ' \
                       f'! videoconvert ' \
                       f'! video/x-raw,format=I420 ' \
                       f'! nvvidconv ' \
                       f'! "video/x-raw(memory:NVMM), format=(string)I420" ' \
                       f'! nvv4l2h264enc insert-sps-pps=1 idrinterval=15 ' \
                       f'! rtph264pay name=pay0 pt=96 --gst-debug=4'

throws the following error:

(python3.8:3735): GStreamer-CRITICAL **: 08:16:01.595: gst_element_make_from_uri: assertion ‘gst_uri_is_valid (uri)’ failed

(python3.8:3735): GStreamer-CRITICAL **: 08:16:01.650: gst_element_link_pads_filtered: assertion ‘GST_IS_BIN (parent)’ failed

(python3.8:3735): GStreamer-CRITICAL **: 08:16:01.657: gst_element_link_pads_filtered: assertion ‘GST_IS_BIN (parent)’ failed
Opening in BLOCKING MODE

4

I just meant remove the single quotes:

f"! video/x-raw(memory:NVMM), format=(string)I420 " \
1 Like
5

what a silly mistake…

thanks for your time!

6

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