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87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
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#!/usr/bin/env python3
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#
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# GStreamer
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#
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# Copyright (C) 2019 Thibault Saunier <tsaunier@igalia.com>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
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# Boston, MA 02110-1335, USA.
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import gi
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import sys
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gi.require_version('Gst', '1.0')
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gi.require_version('GES', '1.0')
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gi.require_version('GstController', '1.0')
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from gi.repository import Gst, GES, GLib, GstController # noqa
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Gst.init(None)
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GES.init()
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def play_timeline(timeline):
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pipeline = GES.Pipeline()
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pipeline.set_timeline(timeline)
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bus = pipeline.get_bus()
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bus.add_signal_watch()
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loop = GLib.MainLoop()
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bus.connect("message", bus_message_cb, loop, pipeline)
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pipeline.set_state(Gst.State.PLAYING)
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loop.run()
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def bus_message_cb(unused_bus, message, loop, pipeline):
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if message.type == Gst.MessageType.EOS:
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print("eos")
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pipeline.set_state(Gst.State.NULL)
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loop.quit()
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elif message.type == Gst.MessageType.ERROR:
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error = message.parse_error()
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pipeline.set_state(Gst.State.NULL)
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print("error %s" % error[1])
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loop.quit()
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if __name__ == "__main__":
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if len(sys.argv) != 2:
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print("You must specify a file path")
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exit(-1)
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timeline = GES.Timeline.new_audio_video()
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layer = timeline.append_layer()
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clip = GES.UriClip.new(Gst.filename_to_uri(sys.argv[1]))
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# Adding clip to the layer so the TrackElements are created
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layer.add_clip(clip)
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# Create an InterpolationControlSource and make sure it interpolates linearly
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control_source = GstController.InterpolationControlSource.new()
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control_source.props.mode = GstController.InterpolationMode.LINEAR
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# Set the keyframes
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control_source.set(0, 0.0) # Fully transparent at 0 second
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control_source.set(Gst.SECOND, 1.0) # Fully opaque at 1 second
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# Get the video source
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video_source = clip.find_track_element(None, GES.VideoSource)
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assert(video_source)
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# And set the control source on the "alpha" property of the video source
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# Using a "direct" binding but "direct-absolute" would work the exact
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# same way as the alpha property range is [0.0 - 1.0] anyway.
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video_source.set_control_source(control_source, "alpha", "direct")
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play_timeline(timeline)
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