Created
February 4, 2019 19:02
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GStreamer Python Dynamic Switching
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import gi | |
gi.require_version('Gst', '1.0') | |
from gi.repository import GObject, Gst | |
from threading import Thread, Event | |
GObject.threads_init() | |
Gst.init(None) | |
class Main: | |
def __init__(self): | |
self.pipeline = Gst.Pipeline.new("pipeline") | |
self.bus = self.pipeline.get_bus() | |
self.videotestsrc1 = Gst.ElementFactory.make("videotestsrc", "videotestsrc1") | |
self.videotestsrc1_src_pad = self.videotestsrc1.get_static_pad("src") | |
self.videotestsrc1.set_property("pattern", 0) | |
self.pipeline.add(self.videotestsrc1) | |
self.videotestsrc2 = Gst.ElementFactory.make("videotestsrc", "videotestsrc2") | |
self.videotestsrc2_src_pad = self.videotestsrc2.get_static_pad("src") | |
self.videotestsrc2.set_property("pattern", 1) | |
self.pipeline.add(self.videotestsrc2) | |
self.input_selector = Gst.ElementFactory.make("input-selector", "input-selector") | |
self.input_selector_sink_pad_1 = self.input_selector.get_request_pad("sink_1") | |
self.input_selector_sink_pad_2 = self.input_selector.get_request_pad("sink_2") | |
self.input_selector.set_property("active-pad", self.input_selector_sink_pad_1) | |
self.pipeline.add(self.input_selector) | |
self.autovideosink = Gst.ElementFactory.make("autovideosink", "autovideosink") | |
self.pipeline.add(self.autovideosink) | |
self.videotestsrc1_src_pad.link(self.input_selector_sink_pad_1) | |
self.videotestsrc2_src_pad.link(self.input_selector_sink_pad_2) | |
self.input_selector.link(self.autovideosink) | |
def change_source(self): | |
while not self.stop_event.is_set(): | |
self.stop_event.wait(1) | |
if self.stop_event.is_set(): | |
break | |
if self.input_selector_sink_pad_1.get_property("active"): | |
self.input_selector.set_property("active-pad", self.input_selector_sink_pad_2) | |
else: | |
self.input_selector.set_property("active-pad", self.input_selector_sink_pad_1) | |
def run(self): | |
self.pipeline.set_state(Gst.State.PLAYING) | |
self.stop_event = Event() | |
self.change_source_thread = Thread(target=self.change_source) | |
self.change_source_thread.start() | |
while True: | |
try: | |
message = self.bus.timed_pop(Gst.SECOND) | |
if message == None: | |
pass | |
elif message.type == Gst.MessageType.EOS: | |
break | |
elif message.type == Gst.MessageType.ERROR: | |
break | |
except KeyboardInterrupt: | |
break | |
self.stop_event.set() | |
self.pipeline.set_state(Gst.State.NULL) | |
start = Main() | |
start.run() |
OK, disregard please. There is a general problem with the GST Python bindings on MacOS 12.4 M1
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Thanks for sharing, but is there any hint how to use this snippet practically?
Running it "as is" with Python3 gives
self.videotestsrc1 = Gst.ElementFactory.make("videotestsrc", "videotestsrc1")
self.videotestsrc1 is
None
after this...