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POAdd overlay text to gstreamer video in Ruby
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  1. POAdd overlay text to gstreamer video in Ruby
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    copied!<p>I have write this very simple video player that use gstreamer and gtk2 in Ruby.</p> <pre><code>require 'gtk2' require 'gst' if ARGV.size != 1 puts "Usage: #{$0} &lt;file&gt;" exit 0 end class VideoWidget &lt; Gtk::DrawingArea def initialize(file) super() @playbin = Gst::ElementFactory.make('playbin2') @video = Gst::ElementFactory.make('xvimagesink') @video.force_aspect_ratio = true @overlay = Gst::ElementFactory.make('textoverlay') @overlay.text = 'Foo bar' @playbin.text_sink = @overlay @playbin.video_sink = @video @playbin.audio_sink = Gst::ElementFactory.make('autoaudiosink') @playbin.signal_connect('notify') do @playbin.video_sink.xwindow_id = self.window.xid if self.window @playbin.video_sink.expose end @playbin.uri = "file://#{File.absolute_path(file)}" @playbin.ready end def play @playbin.play end def pause @playbin.pause end def stop @playbin.stop end def seek(time) @playbin.seek(1.0, Gst::Format::TIME, Gst::Seek::FLAG_FLUSH | Gst::Seek::FLAG_KEY_UNIT, Gst::Seek::TYPE_CUR, time * Gst::SECOND, Gst::Seek::TYPE_NONE, -1); end end window = Gtk::Window.new video = VideoWidget.new(ARGV.first) buttonbox = Gtk::HButtonBox.new button = Gtk::Button.new(Gtk::Stock::MEDIA_PLAY) button.signal_connect('clicked') { video.play } buttonbox.add(button) button = Gtk::Button.new(Gtk::Stock::MEDIA_PAUSE) button.signal_connect('clicked') { video.pause } buttonbox.add(button) button = Gtk::Button.new(Gtk::Stock::MEDIA_STOP) button.signal_connect('clicked') { video.stop } buttonbox.add(button) button = Gtk::Button.new(Gtk::Stock::MEDIA_REWIND) button.signal_connect('clicked') { video.seek(-10) } buttonbox.add(button) button = Gtk::Button.new(Gtk::Stock::MEDIA_FORWARD) button.signal_connect('clicked') { video.seek(10) } buttonbox.add(button) hbox = Gtk::HBox.new hbox.pack_start(buttonbox, false) vbox = Gtk::VBox.new vbox.pack_start(video) vbox.pack_start(hbox, false) window.add(vbox) window.signal_connect('destroy') do video.stop Gtk.main_quit end window.set_default_size(640, 480) window.window_position = Gtk::Window::POS_CENTER window.show_all Gtk.main </code></pre> <p>It works, but i want to display some text over the video. I've try to use the gstreamer element <code>textoverlay</code>, but i do not figured out to link this element in the pipeline. Someone have an idea?</p>
 

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