Using do_transform_frame in GstVideo.VideoFilter (python)
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Hey all,
I have a question about using the do_transform_frame function when creating your own elements. 1. Why is my buffer none within the GstVideo.VideoFrame object. For instance when i try print inframe.buffer (which from my understanding should return a object of type Gst.Buffer) instead returns None. 2. Why is the video a black screen when i dont change anything within do_transform_frame. Do i have to push the outbuffer within the function. If so how do i do this, since the return for do_transform_frame is a Gst.FlowReturn, which are usually just True or False. Thanks for taking the time to read this and helping me out -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Using do_transform_frame in GstVideo.VideoFilter (python)
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Hello,
Implementing elements in python, while supported, is not very thoroughly tested, and what you are describing is most likely a bug. Can you share a minimal example reproducing your issue, or even better file a bug and attach such an example? On 03/26/2018 08:07 PM, dpw157 wrote: > Hey all, > I have a question about using the do_transform_frame function when creating > your own elements. > > 1. Why is my buffer none within the GstVideo.VideoFrame object. For instance > when i try > print inframe.buffer > (which from my understanding should return a object of type Gst.Buffer) > instead returns None. > > 2. Why is the video a black screen when i dont change anything within > do_transform_frame. Do i have to push the outbuffer within the function. If > so how do i do this, since the return for do_transform_frame is a > Gst.FlowReturn, which are usually just True or False. > > Thanks for taking the time to read this and helping me out > > > > -- > Sent from: http://gstreamer-devel.966125.n4.nabble.com/ > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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hey,
so here is some minimal code that may explain my issue. class GstTimestamp(GstVideo.VideoFilter): __gstmetadata__ = ('<longname>', '<classification>', '<description>', '<author>') __gsttemplates__ = (Gst.PadTemplate.new("sink", Gst.PadDirection.SINK, Gst.PadPresence.ALWAYS, Gst.Caps.new_any()), Gst.PadTemplate.new("src", Gst.PadDirection.SRC, Gst.PadPresence.ALWAYS, Gst.Caps.new_any())) def __init__(self): GstVideo.VideoFilter.__init__(self) def do_transform_frame(self,inframe,outframe): #this should give me that data for the frame data = inframe.buffer print data return Gst.FlowReturn.OK When i do this every time a frame a pushed data is None and i just get a blank screen from ximagesink. Thanks for the help and taking the time to look at this -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Using do_transform_frame in GstVideo.VideoFilter (python)
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Can you please file a bug with that code, ideally including the registration code
and various imports to make things easy to reproduce? On 03/27/2018 11:22 PM, dpw157 wrote: > hey, > > so here is some minimal code that may explain my issue. > > class GstTimestamp(GstVideo.VideoFilter): > __gstmetadata__ = ('<longname>', '<classification>', > '<description>', '<author>') > > __gsttemplates__ = (Gst.PadTemplate.new("sink", > Gst.PadDirection.SINK, > Gst.PadPresence.ALWAYS, > Gst.Caps.new_any()), > Gst.PadTemplate.new("src", > Gst.PadDirection.SRC, > Gst.PadPresence.ALWAYS, > Gst.Caps.new_any())) > > def __init__(self): > GstVideo.VideoFilter.__init__(self) > > def do_transform_frame(self,inframe,outframe): > > #this should give me that data for the frame > data = inframe.buffer > print data > return Gst.FlowReturn.OK > > > > When i do this every time a frame a pushed data is None and i just get a > blank screen from ximagesink. > Thanks for the help and taking the time to look at this > > > > -- > Sent from: http://gstreamer-devel.966125.n4.nabble.com/ > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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sure ill do that
btw here is the full code with registration and ill make a bug report right now. I assume i report it here https://bugzilla.gnome.org/ import sys import gi gi.require_version('Gst', '1.0') gi.require_version('GstVideo', '1.0') from gi.repository import GObject, Gst, GstVideo Gst.init(sys.argv) GObject.threads_init() Gst.segtrap_set_enabled(False) class GstTimestamp(GstVideo.VideoFilter): __gstmetadata__ = ('<longname>', '<classification>', '<description>', '<author>') __gsttemplates__ = (Gst.PadTemplate.new("sink", Gst.PadDirection.SINK, Gst.PadPresence.ALWAYS, Gst.Caps.new_any()), Gst.PadTemplate.new("src", Gst.PadDirection.SRC, Gst.PadPresence.ALWAYS, Gst.Caps.new_any())) def __init__(self): GstVideo.VideoFilter.__init__(self) def do_transform_frame(self,inframe,outframe): #this should give me that data for the frame data = inframe.buffer #data is None print data #dont know if im properly sending data back since #i just get blank screen return Gst.FlowReturn.OK #used for registration def plugin_init(plugin): Gst.Element.register(plugin, 'timestamper', 0, GObject.type_register(GstTimestamp)) return True def init(): version = Gst.version() Gst.Plugin.register_static( version[0], version[1], 'timestamper', 'Timestamper', plugin_init, '1.0', 'GPL', 'timestamper', 'plugins-demo', 'demo') init() def connect(bus, name): def _connect(f): bus.connect(name, f) return f return _connect def main(): pipeline = Gst.parse_launch('videotestsrc ! timestamper ! ximagesink') bus = pipeline.get_bus() bus.add_signal_watch() #Gst.debug_set_active(True) #Gst.debug_set_default_threshold(4) @connect(bus, "message::error") def on_error(bus, message): pipeline.set_state(Gst.State.NULL) exit(message.parse_error()) @connect(bus, "message::eos") def on_eos(bus, message): pipeline.set_state(Gst.State.NULL) exit(0) pipeline.set_state(Gst.State.PLAYING) loop = GObject.MainLoop() try: loop.run() except(KeyboardInterrupt): pass pipeline.set_state(Gst.State.NULL) if __name__ == '__main__': main() -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Using do_transform_frame in GstVideo.VideoFilter (python)
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Perfect, yes you want to report this at https://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer,
and select the gst-python component. On 03/27/2018 11:36 PM, dpw157 wrote: > sure ill do that > > btw here is the full code with registration and ill make a bug report right > now. I assume i report it here https://bugzilla.gnome.org/ > > > > import sys > import gi > > gi.require_version('Gst', '1.0') > gi.require_version('GstVideo', '1.0') > > from gi.repository import GObject, Gst, GstVideo > > Gst.init(sys.argv) > GObject.threads_init() > Gst.segtrap_set_enabled(False) > > > class GstTimestamp(GstVideo.VideoFilter): > __gstmetadata__ = ('<longname>', '<classification>', > '<description>', '<author>') > > __gsttemplates__ = (Gst.PadTemplate.new("sink", > Gst.PadDirection.SINK, > Gst.PadPresence.ALWAYS, > Gst.Caps.new_any()), > Gst.PadTemplate.new("src", > Gst.PadDirection.SRC, > Gst.PadPresence.ALWAYS, > Gst.Caps.new_any())) > > def __init__(self): > GstVideo.VideoFilter.__init__(self) > > def do_transform_frame(self,inframe,outframe): > > #this should give me that data for the frame > data = inframe.buffer > #data is None > print data > > #dont know if im properly sending data back since > #i just get blank screen > return Gst.FlowReturn.OK > > > #used for registration > def plugin_init(plugin): > Gst.Element.register(plugin, 'timestamper', 0, > GObject.type_register(GstTimestamp)) > return True > > def init(): > version = Gst.version() > Gst.Plugin.register_static( > version[0], version[1], 'timestamper', 'Timestamper', > plugin_init, '1.0', 'GPL', 'timestamper', > 'plugins-demo', 'demo') > > init() > > > def connect(bus, name): > def _connect(f): > bus.connect(name, f) > return f > return _connect > > def main(): > pipeline = Gst.parse_launch('videotestsrc ! timestamper ! ximagesink') > > bus = pipeline.get_bus() > bus.add_signal_watch() > #Gst.debug_set_active(True) > #Gst.debug_set_default_threshold(4) > > @connect(bus, "message::error") > def on_error(bus, message): > pipeline.set_state(Gst.State.NULL) > exit(message.parse_error()) > > @connect(bus, "message::eos") > def on_eos(bus, message): > pipeline.set_state(Gst.State.NULL) > exit(0) > > pipeline.set_state(Gst.State.PLAYING) > loop = GObject.MainLoop() > try: > loop.run() > except(KeyboardInterrupt): > pass > > pipeline.set_state(Gst.State.NULL) > > if __name__ == '__main__': > main() > > > > > > -- > Sent from: http://gstreamer-devel.966125.n4.nabble.com/ > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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hey,
K i posted the bug report and will try to help solve it(with my limited knowledge). If their is anything else u need from me to help solve this issue let me know thanks -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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In reply to this post by Mathieu Duponchelle
Oh just in case anyone wants the bug link or something
Bug 794744 - Data is none in buffer from GstVideo.VideoFrame https://bugzilla.gnome.org/show_bug.cgi?id=794744 -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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