GstBus not getting EOS Event

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GstBus not getting EOS Event

ravi.modha

I am new to GStreamer and I have created a small example where I am recording the webcam and used app sink to get the sample but when I try to stop the pipeline by setting its state to null and sending EOS event, my bus callback function never gets called for the EOS. And because of this memory leak is happening.

Guys, Please help me


import gi import time import threading

gi.require_version('Gst', '1.0') gi.require_version('Gtk', '3.0') gi.require_version('GstApp', '1.0')

from gi.repository import GObject, Gst, Gtk, GstApp import signal

Gst.init(None)

class Main: 

shutdown = False

def __init__(self):
    signal.signal(signal.SIGINT, self.keyboardInterruptHandler)

    self._pipeline = Gst.parse_launch("avfvideosrc 
    name=avfvideosrc ! x264enc name=x264enc ! appsink 
    name=appsink max-buffers=1 drop=false sync=false emit- 
    signals=true wait-on-eos=false")
    bus = self._pipeline.get_bus()
    bus.add_signal_watch()
    bus.connect("message::eos", self._on_eos_from_sink_pipeline)
    bus.connect("message", self.on_status_changed)
    appsink = self._pipeline.get_by_name('appsink')
    appsink.connect('new-sample', self.on_new_sample)
    appsink.connect('eos', self.eos)

    #bus.connect('message', self.on_status_changed)
    self._pipeline.set_state(Gst.State.PLAYING)

def on_new_sample(self, appsink):
    return Gst.FlowReturn.OK

def _on_eos_from_sink_pipeline(self, _bus, _message):
    print("Got EOS from sink pipeline")
    exit()

def eos(self, sink):
    print("SINK EOS")
    return True

def on_status_changed(self, bus, message):
    print('Status: ', message.type)
    print('Object: ', message.src)
    print('Parsed Message: ', message.parse_state_changed())

def keyboardInterruptHandler(self,signal, frame):
    print("KeyboardInterrupt (ID: {}) has been caught. Cleaning 
    up...".format(signal))
    self.shutdown = True
    self.stopFetching()

def stopFetching(self):
    print("AT THE START OF STOP FETCHING")       
    self._pipeline.set_state(Gst.State.NULL)
    self._pipeline.send_event(Gst.Event.new_eos())
    print("AT THE END OF STOP FETCHING")
start = Main()
Gtk.main()`
--
Thanks & Regards,
--
Thanks & Regards,

Ravi Modha

    
<a href="callto:+91%2020%204674%200881" style="color:rgb(17,85,204)" target="_blank">+91 20 4674 0881 | <a href="callto:+1%20408%20216%208162" style="color:rgb(17,85,204)" target="_blank">+1 408 216 8162

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Re: GstBus not getting EOS Event

Matthew Waters
You cannot expect any messages on the bus after you have set the pipeline to NULL.  Your EOS message will be dropped on the floor and `self._pipeline.send_event(Gst.Event.new_eos())` would very likely return FALSE indicating a failure to send the message.

Cheers
-Matt

On 4/11/19 7:46 pm, Ravi Modha wrote:

I am new to GStreamer and I have created a small example where I am recording the webcam and used app sink to get the sample but when I try to stop the pipeline by setting its state to null and sending EOS event, my bus callback function never gets called for the EOS. And because of this memory leak is happening.

Guys, Please help me


import gi import time import threading

gi.require_version('Gst', '1.0') gi.require_version('Gtk', '3.0') gi.require_version('GstApp', '1.0')

from gi.repository import GObject, Gst, Gtk, GstApp import signal

Gst.init(None)

class Main: 

shutdown = False

def __init__(self):
    signal.signal(signal.SIGINT, self.keyboardInterruptHandler)

    self._pipeline = Gst.parse_launch("avfvideosrc 
    name=avfvideosrc ! x264enc name=x264enc ! appsink 
    name=appsink max-buffers=1 drop=false sync=false emit- 
    signals=true wait-on-eos=false")
    bus = self._pipeline.get_bus()
    bus.add_signal_watch()
    bus.connect("message::eos", self._on_eos_from_sink_pipeline)
    bus.connect("message", self.on_status_changed)
    appsink = self._pipeline.get_by_name('appsink')
    appsink.connect('new-sample', self.on_new_sample)
    appsink.connect('eos', self.eos)

    #bus.connect('message', self.on_status_changed)
    self._pipeline.set_state(Gst.State.PLAYING)

def on_new_sample(self, appsink):
    return Gst.FlowReturn.OK

def _on_eos_from_sink_pipeline(self, _bus, _message):
    print("Got EOS from sink pipeline")
    exit()

def eos(self, sink):
    print("SINK EOS")
    return True

def on_status_changed(self, bus, message):
    print('Status: ', message.type)
    print('Object: ', message.src)
    print('Parsed Message: ', message.parse_state_changed())

def keyboardInterruptHandler(self,signal, frame):
    print("KeyboardInterrupt (ID: {}) has been caught. Cleaning 
    up...".format(signal))
    self.shutdown = True
    self.stopFetching()

def stopFetching(self):
    print("AT THE START OF STOP FETCHING")       
    self._pipeline.set_state(Gst.State.NULL)
    self._pipeline.send_event(Gst.Event.new_eos())
    print("AT THE END OF STOP FETCHING")
start = Main()
Gtk.main()`
--
Thanks & Regards,
--
Thanks & Regards,

Ravi Modha

    
<a href="callto:+91%2020%204674%200881" style="color:rgb(17,85,204)" target="_blank" moz-do-not-send="true">+91 20 4674 0881 | <a href="callto:+1%20408%20216%208162" style="color:rgb(17,85,204)" target="_blank" moz-do-not-send="true">+1 408 216 8162

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Re: GstBus not getting EOS Event

ravi.modha
This post was updated on .
Hello Mathew,

First of all, Thanks a lot for your reply. Even if I don’t set NULL to pipeline and send the EOS event to the pipeline, I never get EOS message on the bus. The code I added is the small portion of my project and in the project instead of avfvideosrc, we have used v4l2src with appsink. Now without EOS pipeline is not cleaning up its resources and I am getting the memory leaks.

Please help me! I am stuck on this for a month.

> On Nov 6, 2019, at 5:16 PM, Matthew Waters <ystreet00@gmail.com> wrote:
>
> You cannot expect any messages on the bus after you have set the pipeline to NULL.  Your EOS message will be dropped on the floor and `self._pipeline.send_event(Gst.Event.new_eos())` would very likely return FALSE indicating a failure to send the message.
>
> Cheers
> -Matt
>
> On 4/11/19 7:46 pm, Ravi Modha wrote:
>> I am new to GStreamer and I have created a small example where I am recording the webcam and used app sink to get the sample but when I try to stop the pipeline by setting its state to null and sending EOS event, my bus callback function never gets called for the EOS. And because of this memory leak is happening.
>>
>> Guys, Please help me
>>
>>
>>
>> import gi import time import threading
>>
>> gi.require_version('Gst', '1.0') gi.require_version('Gtk', '3.0') gi.require_version('GstApp', '1.0')
>>
>> from gi.repository import GObject, Gst, Gtk, GstApp import signal
>>
>> Gst.init(None)
>>
>> class Main:
>>
>> shutdown = False
>>
>> def __init__(self):
>>     signal.signal(signal.SIGINT, self.keyboardInterruptHandler)
>>
>>     self._pipeline = Gst.parse_launch("avfvideosrc
>>     name=avfvideosrc ! x264enc name=x264enc ! appsink
>>     name=appsink max-buffers=1 drop=false sync=false emit-
>>     signals=true wait-on-eos=false")
>>     bus = self._pipeline.get_bus()
>>     bus.add_signal_watch()
>>     bus.connect("message::eos", self._on_eos_from_sink_pipeline)
>>     bus.connect("message", self.on_status_changed)
>>     appsink = self._pipeline.get_by_name('appsink')
>>     appsink.connect('new-sample', self.on_new_sample)
>>     appsink.connect('eos', self.eos)
>>
>>     #bus.connect('message', self.on_status_changed)
>>     self._pipeline.set_state(Gst.State.PLAYING)
>>
>> def on_new_sample(self, appsink):
>>     return Gst.FlowReturn.OK
>>
>> def _on_eos_from_sink_pipeline(self, _bus, _message):
>>     print("Got EOS from sink pipeline")
>>     exit()
>>
>> def eos(self, sink):
>>     print("SINK EOS")
>>     return True
>>
>> def on_status_changed(self, bus, message):
>>     print('Status: ', message.type)
>>     print('Object: ', message.src)
>>     print('Parsed Message: ', message.parse_state_changed())
>>
>> def keyboardInterruptHandler(self,signal, frame):
>>     print("KeyboardInterrupt (ID: {}) has been caught. Cleaning
>>     up...".format(signal))
>>     self.shutdown = True
>>     self.stopFetching()
>>
>> def stopFetching(self):
>>     print("AT THE START OF STOP FETCHING")      
>>     self._pipeline.set_state(Gst.State.NULL)
>>     self._pipeline.send_event(Gst.Event.new_eos())
>>     print("AT THE END OF STOP FETCHING")
>> start = Main()
>> Gtk.main()`
>> --
>> Thanks & Regards,
>> --
>> Thanks & Regards,
>>
>> Ravi Modha
>> ravi.modha@tudip.com <mailto:ravi.modha@tudip.com> | Skype: ravi.modha@tudip.com <mailto:ravi.modha@tudip.com>
>>
>>  <https://tudip.com/>  <https://in.linkedin.com/company/tudip-technologies-pvt-ltd-> <https://clutch.co/profile/tudip-technologies> <https://www.goodfirms.co/companies/view/4439/tudip-technologies-pvt-ltd>  <https://www.facebook.com/TudipTechnologies>  <https://twitter.com/TudipTech>  <https://www.youtube.com/channel/UCoNPz2mbzNF_AZhLQEzuWCg>
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>>
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