Gstreamer基本教程给出了空白屏幕

时间:2013-08-14 16:40:48

标签: ffmpeg gstreamer video-processing

我有以下gstreamer基础教程。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时会发生同样的情况,但是我提供-vo x11选项并且它运行良好(对于mplayer)。所以,我猜这个问题gstreamer也是一样的。所以,我的问题是......“我应该怎么做告诉程序我的输出驱动程序是x11?”如何摆脱空白屏幕?

由于

#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;
}

1 个答案:

答案 0 :(得分: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。 此元素(type = sink)是基于X11的,并使用转储(筛选)传入缓冲区 X11 API