GTK3.0中gstreamer如何同时播放视频和音频

How to play video and audio together simultaneously with gstreamer in GTK3.0

我有一个 GUI,可以在上面播放视频。我使用 Gtk3.0 作为 GUI,我使用 gstreamer1.0 来播放视频。但是当视频播放时,我想播放音频。所以,在播放视频时,我想提供信息音频信息。播放音频时视频应该不停播放。我使用 gstreamer 示例代码,并根据自己修改了代码。 (示例代码是:https://gstreamer.freedesktop.org/documentation/tutorials/basic/toolkit-integration.html)我不知道如何在背景上添加第二个元素(音频)。我应该如何添加第二个元素?

你可以添加这个形状。无需使用 gst_init(&argc, &argv);。只需将 pipeline 添加到您的代码中。您可以在 gstreamer 网站上找到此代码。 https://gstreamer.freedesktop.org/documentation/tutorials/basic/hello-world.html

 #include <gst/gst.h>

int main(int argc, char *argv[]) {
  GstElement *pipeline;
  GstBus *bus;
  GstMessage *msg;

  /* Initialize GStreamer */
  gst_init (&argc, &argv);

  /* Build the pipeline */
  pipeline = gst_parse_launch ("playbin uri=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm", NULL);

  /* Start playing */
  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  /* Wait until error or EOS */
  bus = gst_element_get_bus (pipeline);
  msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);

  /* Free resources */
  if (msg != NULL)
    gst_message_unref (msg);
  gst_object_unref (bus);
  gst_element_set_state (pipeline, GST_STATE_NULL);
  gst_object_unref (pipeline);
  return 0;
}