我尝试编写一个非常简单的GStreamer应用程序。只要GStreamer做某事,它的作用并不重要。即使只显示一些文字或简单的JPEG也没关系。
下面是Googling找到的最好的例子(我添加了一些错误检查)。当我在Windows下运行的Linux虚拟机中运行它时,我看到这个控制台消息:
libEGL警告:fd 4的pci id:80ee:beef,driver(null)
libEGL警告:DRI2:无法打开vboxvideo(搜索路径 / usr / lib中/ I386-Linux的GNU / DRI:$ {ORIGIN} / DRI:/ usr / lib中/ DRI)
Google搜索表示这是虚拟机内3D渲染的错误。我找不到解决办法。
那么,有人可以修复下面的代码,以便它可以在VM中运行吗?我认为这意味着避免3D渲染,所以可能会显示图像或一些文字?没有必要播放视频,这只是在其他内容中使用GStreamer的概念的简单证明(必须在VM中运行)。
这是代码......
void GstreamerPlayVideo()
{
GstElement *pipeline;
GstBus *bus;
GstMessage *msg;
int argc;
GError *error = NULL;
/* Initialize GStreamer */
if (gst_init_check(&argc, NULL, &error) == TRUE)
{
/* Build the pipeline */
// Change URL to test failure
pipeline = gst_parse_launch ("bin uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", &error);
//// pipeline = gst_parse_launch ("bin uri=http://tecfa.unige.ch/guides/x3d/www.web3d.org/x3d/content/examples/HelloWorld.gif", &error);
if (pipeline != NULL)
{
/* Start playing */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* wait until it's up and running or failed */
if (gst_element_get_state (pipeline, NULL, NULL, -1) == GST_STATE_CHANGE_FAILURE)
{
g_error ("GST failed to go into PLAYING state");
exit(1);
}
/* Wait until error or EOS */
bus = gst_element_get_bus (pipeline);
if (bus != NULL)
{
msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* Parse message */
if (msg != NULL)
{
gchar *debug_info;
switch (GST_MESSAGE_TYPE (msg))
{
case GST_MESSAGE_ERROR:
gst_message_parse_error (msg, &error, &debug_info);
g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), error->message);
g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
g_clear_error (&error);
g_free (debug_info);
break;
case GST_MESSAGE_EOS:
g_print ("End-Of-Stream reached.\n");
break;
default:
/* We should not reach here because we only asked for ERRORs and EOS */
g_printerr ("Unexpected message received.\n");
break;
}
gst_message_unref (msg);
}
/* Free resources */
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
}
else
{
g_print ("GST get bus error: %s\n", error->message);
exit(1);
}
}
else
{
g_print ("GST parse error: %s\n", error->message);
exit(1);
}
}
else
{
g_print ("GST init error: %s\n", error->message);
exit(1);
}
} // GstreamerPlayVideo()
答案 0 :(得分:1)
尝试在管道中手动指定视频接收器。
videotestsrc! ximagesink
您的系统可能安装了EGL视频接收器插件作为主要视频插件。 ximagesink似乎更有可能发挥作用。
像这样:
//this line is where you're creating your pipeline
pipeline = gst_parse_launch ("videotestsrc ! ximagesink", &error);
我建议首先尝试使用gst-launch命令,这样你就可以了解管道语法,接收器和源代码等等。你可以运行的最简单的测试是这样的(如果你安装了gstreamer 1.0,你可能有0.10),来自命令行:
gst-launch-1.0 videotestsrc ! autovideosink