AW: GStreamer (1.14) Pipeline in Python3

[Jonathan Baecker]

On 26.12.18 14:58, Bernhard Graaf wrote:
>
> Hi,
>
> You use the wrong audiosink:
>
> audio_sink = Gst.ElementFactory.make('autovideosink', 'audio_sink') 
> àautoaudiosink?
>
> Bernhard
>
Obs... How stupid is that - yes you are right! That was the problem. 
Maybe I copy that line and forgot to change the sink...

Thank you for pointing this out!

Jonathan


> ------------------------------------------------------------------------
>
> *Von:*gstreamer-devel 
> [mailto:gstreamer-devel-bounces at lists.freedesktop.org] *Im Auftrag von 
> *Jonathan Baecker
> *Gesendet:* Mittwoch, 26. Dezember 2018 13:22
> *An:* gstreamer-devel at lists.freedesktop.org
> *Betreff:* GStreamer (1.14) Pipeline in Python3
>
> Hello,
>
> I try to understand the way Python and gstreamer works together. I'm 
> able to build a pipeline for only video and that plays just fine, but 
> when I add audio my pipeline stops by the first frame and put this to 
> screen.
>
> Can you tell me, what is wrong with my code here?:
>
>     #!/usr/bin/env python3
>
>     import gi
>     gi.require_version('Gst', '1.0')
>     gi.require_version('GLib', '2.0')
>     from gi.repository import GLib, Gst
>
>     # mode debugging infos
>     Gst.debug_set_active(True)
>     Gst.debug_set_default_threshold(3)
>
>
>     # callback link pads
>     def on_new_decoded_pad(dbin, pad):
>         type = pad.query_caps(None).to_string()
>         decode = pad.get_parent()
>         pipeline = decode.get_parent()
>
>         if type.startswith("video"):
>             video_queue = pipeline.get_by_name("video_queue")
>             decode.link(video_queue)
>             print("linked video")
>         if type.startswith("audio"):
>             audio_queue = pipeline.get_by_name("audio_queue")
>             decode.link(audio_queue)
>             print("linked audio")
>
>
>     def main():
>         Gst.init(None)
>
>         # create new pipeline
>         pipe = Gst.Pipeline.new('pipleline')
>
>         # add source and decoder
>         src = Gst.ElementFactory.make('filesrc', "src")
>         decode = Gst.ElementFactory.make('decodebin', 'decode')
>
>         # video queue and sink
>         video_queue = Gst.ElementFactory.make('queue', 'video_queue')
>         video_sink = Gst.ElementFactory.make('autovideosink',
>     'video_sink')
>
>         # audio queue and sink
>         audio_queue = Gst.ElementFactory.make('queue', 'audio_queue')
>         audio_convert = Gst.ElementFactory.make('audioconvert',
>     'audio_convert')
>         audio_sink = Gst.ElementFactory.make('autovideosink',
>     'audio_sink')
>
>         # set some properties
>         src.set_property('location', 'test.mp4')
>         video_sink.set_property('sync', 'true')
>         audio_sink.set_property('sync', 'true')
>
>         # create pipeline
>         pipe.add(src)
>         pipe.add(decode)
>         pipe.add(video_queue)
>         pipe.add(video_sink)
>         pipe.add(audio_queue)
>         pipe.add(audio_convert)
>         pipe.add(audio_sink)
>
>         # link elements
>         src.link(decode)
>         video_queue.link(video_sink)
>         audio_queue.link(audio_convert)
>         audio_convert.link(audio_sink)
>
>         # link decoder to coresponding queue
>         decode.connect('pad-added', on_new_decoded_pad)
>
>         loop = GLib.MainLoop()
>
>         # start pipeline in play mode
>         pipe.set_state(Gst.State.PLAYING)
>         loop.run()
>
>         # cleanup
>         pipe.set_state(Gst.State.NULL)
>
>
>     if __name__ == '__main__':
>         main()
>
> I hope it is ok, to post so much code here, when not I can post next 
> time a gist link.
>
> Regards
>
> Jonathan
>
>
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