mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-23 16:50:47 +00:00
87 lines
No EOL
2.8 KiB
Python
Executable file
87 lines
No EOL
2.8 KiB
Python
Executable file
#!/usr/bin/env python3
|
|
#
|
|
# GStreamer
|
|
#
|
|
# Copyright (C) 2019 Thibault Saunier <tsaunier@igalia.com>
|
|
#
|
|
# This library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Library General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2 of the License, or (at your option) any later version.
|
|
#
|
|
# This library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
# Library General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Library General Public
|
|
# License along with this library; if not, write to the
|
|
# Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
|
|
# Boston, MA 02110-1335, USA.
|
|
|
|
import gi
|
|
import sys
|
|
|
|
gi.require_version('Gst', '1.0')
|
|
gi.require_version('GES', '1.0')
|
|
gi.require_version('GstController', '1.0')
|
|
|
|
from gi.repository import Gst, GES, GLib, GstController # noqa
|
|
|
|
Gst.init(None)
|
|
GES.init()
|
|
|
|
|
|
def play_timeline(timeline):
|
|
pipeline = GES.Pipeline()
|
|
pipeline.set_timeline(timeline)
|
|
bus = pipeline.get_bus()
|
|
bus.add_signal_watch()
|
|
loop = GLib.MainLoop()
|
|
bus.connect("message", bus_message_cb, loop, pipeline)
|
|
pipeline.set_state(Gst.State.PLAYING)
|
|
|
|
loop.run()
|
|
|
|
def bus_message_cb(unused_bus, message, loop, pipeline):
|
|
if message.type == Gst.MessageType.EOS:
|
|
print("eos")
|
|
pipeline.set_state(Gst.State.NULL)
|
|
loop.quit()
|
|
elif message.type == Gst.MessageType.ERROR:
|
|
error = message.parse_error()
|
|
pipeline.set_state(Gst.State.NULL)
|
|
print("error %s" % error[1])
|
|
loop.quit()
|
|
|
|
if __name__ == "__main__":
|
|
if len(sys.argv) != 2:
|
|
print("You must specify a file path")
|
|
exit(-1)
|
|
|
|
timeline = GES.Timeline.new_audio_video()
|
|
|
|
layer = timeline.append_layer()
|
|
clip = GES.UriClip.new(Gst.filename_to_uri(sys.argv[1]))
|
|
|
|
# Adding clip to the layer so the TrackElements are created
|
|
layer.add_clip(clip)
|
|
|
|
# Create an InterpolationControlSource and make sure it interpolates linearly
|
|
control_source = GstController.InterpolationControlSource.new()
|
|
control_source.props.mode = GstController.InterpolationMode.LINEAR
|
|
|
|
# Set the keyframes
|
|
control_source.set(0, 0.0) # Fully transparent at 0 second
|
|
control_source.set(Gst.SECOND, 1.0) # Fully opaque at 1 second
|
|
|
|
# Get the video source
|
|
video_source = clip.find_track_element(None, GES.VideoSource)
|
|
assert(video_source)
|
|
|
|
# And set the control source on the "alpha" property of the video source
|
|
# Using a "direct" binding but "direct-absolute" would work the exact
|
|
# same way as the alpha property range is [0.0 - 1.0] anyway.
|
|
video_source.set_control_source(control_source, "alpha", "direct")
|
|
|
|
play_timeline(timeline) |