Maandelijks archief juli 2022

helloworld.py example:

#!/usr/bin/env python

import sys

import gi
gi.require_version(‘Gst’, ‘1.0’)
from gi.repository import GObject, Gst, GLib

def bus_call(bus, message, loop):
t = message.type
if t == Gst.MessageType.EOS:
sys.stdout.write(“End-of-stream\n”)
loop.quit()
elif t == Gst.MessageType.ERROR:
err, debug = message.parse_error()
sys.stderr.write(“Error: %s: %s\n” % (err, debug))
loop.quit()
return True

def main(args):
if len(args) != 2:
sys.stderr.write(“usage: %s <media file or uri>\n” % args[0])
sys.exit(1)

Gst.init(None)

playbin = Gst.ElementFactory.make(“playbin”, None)
if not playbin:
sys.stderr.write(“‘playbin’ gstreamer plugin missing\n”)
sys.exit(1)

# take the commandline argument and ensure that it is a uri
if Gst.uri_is_valid(args[1]):
uri = args[1]
else:
uri = Gst.filename_to_uri(args[1])
playbin.set_property(‘uri’, uri)

# create and event loop and feed gstreamer bus mesages to it
loop = GLib.MainLoop()

bus = playbin.get_bus()
bus.add_signal_watch()
bus.connect (“message”, bus_call, loop)
# Create element to add (echo)/equalizer-10bands to the signal
gecho = Gst.ElementFactory.make(‘audioecho’)
gecho.set_property(‘delay’, 500000000)
gecho.set_property(‘intensity’, 0.6)
gecho.set_property(‘feedback’, 0.4)
gequa = Gst.ElementFactory.make(‘equalizer-10bands’)
gequa.set_property(‘band2’, 3.0)
# Create playbin and add the custom audio sink to it
playbin.set_property(‘audio_filter’, gequa)
#playbin.set_property(‘audio_filter’, gecho)
# start play back and listed to events
playbin.set_state(Gst.State.PLAYING)
try:
loop.run()
except:
pass

# cleanup
playbin.set_state(Gst.State.NULL)

if __name__ == ‘__main__’:
sys.exit(main(sys.argv))