Question

嗨我在Windows 7 64bit上使用gstreamer-0.10时遇到了一些问题（使用32位gstreamer）。

请参阅下面的代码，了解教程1（针对VS2010进行了修改）：

#include <gst/gst.h>

int main(int argc, char *argv[]) {
  GstElement *pipeline;
  GstBus *bus;
  GstMessage *msg;
  // Added GError to catch pipeline problems?
  // http://stackoverflow.com/questions/14923306/gstreamer-with-visual-c-express-2010-tutorial-1
  GError **errorMsg = NULL;

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

  /* Build the pipeline */
  pipeline = gst_parse_launch ("playbin2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", errorMsg);
  // pipeline = gst_parse_launch ("playbin uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", errorMsg);
  // pipeline = gst_parse_launch ("playbin2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
  // pipeline = gst_parse_launch ("playbin uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", NULL);
  // pipeline = gst_parse_launch ("videotestsrc ! autovideosink", errorMsg);

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

  /* Wait until error or EOS */
  bus = gst_element_get_bus (pipeline);

  /* MSVC Compiler is more strict with enum type casting hence the (GstMessageType) cast on the second parameter */
  msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, (GstMessageType)(GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
  // 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;
}

上面的代码编译得很好但是我在运行时收到以下输出：

(basic-tutorial-1_debug.exe:8700): GStreamer-CRITICAL **: gst_element_set_state:
 assertion `GST_IS_ELEMENT (element)' failed

(basic-tutorial-1_debug.exe:8700): GStreamer-CRITICAL **: gst_element_get_bus: a
ssertion `GST_IS_ELEMENT (element)' failed

(basic-tutorial-1_debug.exe:8700): GStreamer-CRITICAL **: gst_bus_timed_pop_filt
ered: assertion `GST_IS_BUS (bus)' failed

(basic-tutorial-1_debug.exe:8700): GStreamer-CRITICAL **: gst_object_unref: asse
rtion `object != NULL' failed

(basic-tutorial-1_debug.exe:8700): GStreamer-CRITICAL **: gst_element_set_state:
 assertion `GST_IS_ELEMENT (element)' failed

(basic-tutorial-1_debug.exe:8700): GStreamer-CRITICAL **: gst_object_unref: asse
rtion `object != NULL' failed

我还使用了--gst-debug-level = 4（下面选择的输出）：

it_check: initialized GStreamer successfully
0:00:00.358921084  8236   004D5000 INFO            GST_PIPELINE gstparse.c:334:g
st_parse_launch_full: parsing pipeline description 'playbin2 uri=http://docs.gst
reamer.com/media/sintel_trailer-480p.webm'
0:00:00.368644038  8236   004D5000 DEBUG           GST_PIPELINE parse.l:107:priv
_gst_parse_yylex: flex: IDENTIFIER: playbin2
0:00:00.375062362  8236   004D5000 INFO     GST_ELEMENT_FACTORY gstelementfactor
y.c:467:gst_element_factory_make: no such element factory "playbin2"!
0:00:00.381743480  8236   004D5000 ERROR           GST_PIPELINE ./grammar.y:661:
priv_gst_parse_yyparse: no element "playbin2"
0:00:00.387568465  8236   004D5000 ERROR           GST_PIPELINE ./grammar.y:929:
priv_gst_parse_launch: Unrecoverable syntax error while parsing pipeline playbin
2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm

我还尝试将'playbin2'重命名为'playbin'以及一些更常规的管道（在命令行上工作）。

如果有任何帮助，我将不胜感激。

GStreamer基础教程1 Visual Studio 2010 C ++

0 个答案: