Gstreamer基本教程给出了空白屏幕

Question

我有以下gstreamer基本教程。当我编译并运行程序时，我只得到一个空白屏幕。当我使用mplayer时也会发生同样的情况，但我为它提供了-vo x11选项，它工作得很好（对于mplayer）。所以，我猜gstreamer的问题也是一样的。所以，我的问题是…"我该怎么告诉程序我的输出驱动程序是x11？"我该如何摆脱空白屏幕？

感谢

#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 ("playbin2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
  */
    pipeline = gst_parse_launch ("playbin2 uri=file:///home/mylogin/gstreamerstuff/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;
}

Answer 1

在将管道设置为播放之前，请尝试添加此代码。

{
    GstElement* vsink = gst_element_factory_make ("ximagesink", NULL);
    g_object_set (G_OBJECT (pipeline), "video-sink", vsink, NULL);
}

上面的代码确保管道使用名为ximagesink的GstElement。这个元素（type=sink）基于X11，使用X11 API