"nvv4l2h264enc" plugin: STOP PROBLEM

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
7

It may be related to gstd or to your pipeline, or plugins failing to keep sync.
You may try this simple example launching a gstreamer pipeline going from camera source → h264enc → h264dec → videosink (needs sync=false in R32.5), where you can pause the pipeline and restart (stopping and restarting also works):

#!/usr/bin/env python

import sys, os
import gi
gi.require_version('Gst', '1.0')
gi.require_version('Gtk', '3.0')
from gi.repository import Gst, GObject, Gtk


def verbose_deep_notify_cb(object, orig, pspec, component):
    """
    A quick attempt to mimic gst-launch verbose mode.
    """
    if pspec.value_type == Gst.Caps.__gtype__:
    	caps = orig.get_current_caps()
    	if caps != None:
    	   print("%s/%s/%s: caps = \"%s\"" % (object.get_name(), orig.parent.get_name(), orig.get_name(), caps.to_string()))



class GTK_Main:
    def __init__(self):
        window = Gtk.Window(Gtk.WindowType.TOPLEVEL)
        window.set_title("CamRecorder")
        window.set_default_size(100, 100)
        window.connect("destroy", Gtk.main_quit, "WM destroy")
        vbox = Gtk.VBox()
        window.add(vbox)
        hbox = Gtk.HBox()
        vbox.pack_start(hbox, False, False, 0)
        hbox.set_border_width(10)
        hbox.pack_start(Gtk.Label(), False, False, 0)
        self.button = Gtk.Button("Start")
        self.button.connect("clicked", self.start_stop)
        hbox.pack_start(self.button, False, False, 0)
        self.button2 = Gtk.Button("Quit")
        self.button2.connect("clicked", self.exit)
        hbox.pack_start(self.button2, False, False, 0)
        hbox.add(Gtk.Label())
        window.show_all()

        # Set up the gstreamer pipeline

        # IMX219 sensor on CSI-0
        #gst_str = "nvarguscamerasrc ! video/x-raw(memory:NVMM), format=NV12, width=640, height=480, framerate=30/1 ! nvv4l2h264enc ! nvv4l2decoder enable-max-performance=1 ! nvvidconv ! xvimagesink sync=false"

        # ZED camera on /dev/video1
        gst_str = "v4l2src device=/dev/video1 ! video/x-raw,format=YUY2, width=2560, height=720, framerate=30/1 ! nvvidconv ! nvv4l2h264enc ! nvv4l2decoder enable-max-performance=1 ! nvvidconv ! xvimagesink sync=false"

        self.player = Gst.parse_launch (gst_str)
        self.player.connect('deep-notify', verbose_deep_notify_cb, self)
        bus = self.player.get_bus()
        bus.add_signal_watch()
        bus.enable_sync_message_emission()
        bus.connect("message", self.on_message)

    def start_stop(self, w, data=None):
        if self.button.get_label() == "Start":
            print("Setting pipeline to READY ...")
            self.player.set_state(Gst.State.READY)
            print("Setting pipeline to PAUSED ...")
            self.player.set_state(Gst.State.PAUSED)
            print("Setting pipeline PLAYING...")
            self.player.set_state(Gst.State.PLAYING)
            self.button.set_label("Pause")
        elif self.button.get_label() == "Resume":
            print("Setting pipeline to PLAYING ...")
            self.player.set_state(Gst.State.PLAYING)
            self.button.set_label("Pause")
        else:
            print("Setting pipeline to PAUSED ...")
            self.player.set_state(Gst.State.PAUSED)
            self.button.set_label("Resume")

    def exit(self, w):
        self.player.set_state(Gst.State.NULL)
        Gtk.main_quit()

    def on_message(self, bus, message):
        t = message.type
        if t == Gst.MessageType.EOS:
            print('Received message type EOS')
            self.player.set_state(Gst.State.NULL)
            self.button.set_label("Start")
        elif t == Gst.MessageType.ERROR:
            err, debug = message.parse_error()
            print("Error: %s" % err, debug)
            self.player.set_state(Gst.State.NULL)
            self.button.set_label("Start")
	

Gst.debug_set_active(True)
Gst.debug_set_default_threshold(0)
GObject.threads_init()
Gst.init(None)
GTK_Main()
Gtk.main()