voctocore/videomix.py



import sys, inspect
from pprint import pprint
from gi.repository import GLib, Gst

class Videomix:
    decoder = []
    mixerpads = []

    def __init__(self):
        self.pipeline = Gst.parse_launch("""
            videomixer name=livevideo ! autovideosink
            input-selector name=liveaudio ! autoaudiosink
        """)
        
        uris = ('file:///home/peter/122.mp4', 'file:///home/peter/10025.mp4',)
        for idx, uri in enumerate(uris):
            # create a bin for camera input
            camberabin = Gst.parse_bin_from_description("""
                uridecodebin name=input
                input. ! videoconvert ! videoscale ! videorate ! video/x-raw,width=1024,height=576,framerate=25/1 ! identity name=video_src
                input. ! audioconvert name=audio_src
            """, False)

            # configure camera input
            camberabin.get_by_name('input').set_property('uri', uri)

            # add to pipeline and link to mixers
            self.pipeline.add(camberabin)
            camberabin.get_by_name('video_src').link(self.pipeline.get_by_name('livevideo'))
            camberabin.get_by_name('audio_src').link(self.pipeline.get_by_name('liveaudio'))

        # demonstrate some control
        liveaudio = self.pipeline.get_by_name('liveaudio')
        liveaudio.set_property('active-pad', liveaudio.get_static_pad('sink_0'))

        livevideo = self.pipeline.get_by_name('livevideo')
        pad = livevideo.get_static_pad('sink_1')
        pad.set_property('alpha', 0.5)

        self.pipeline.set_state(Gst.State.PLAYING)