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我正在为 IMX 氮气 6x 编写一个 GStreamer 应用程序，以编码到 h264、解码和渲染。这适用于下面提到的 Gstreamer 命令。

#gst-launch-1.0 videotestsrc ! imxvpuenc_h264 ! queue ! imxvpudec ! imx2dvideosink

但是 Gstreamer 应用程序代码不起作用。面临以下错误：

>> 0:00:00.229253000 245 0x9d1ee0 错误 imxeglplatform_fb egl_platform_fb.c:72:gst_imx_egl_viv_sink_egl_platform_create：eglGetDisplay 失败：分配错误

读者可以帮助我。

#include <gst/gst.h>
#include <gst/app/gstappsink.h>
#include <stdlib.h>

//#define CAPS "video/x-raw,format=RGB,width=160,pixel-aspect-ratio=1/1"
#define CAPS "video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, level=(string)2, profile=(string)high, width=(int)320, height=(int)240, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1"

int
main (int argc, char *argv[])
{
  GstElement *pipeline, *sink, *dec_pipeline, *source;
  gint       width, height;
  GstSample  *sample;
  GstBuffer  *buf;
  gchar      *descr, *dec_descr;
  GError     *error = NULL;
  gint64     duration, position;
  GstStateChangeReturn ret;
  gboolean   res;
  GstMapInfo map;
  gint       itr;

  gst_init (&argc, &argv);

  /* create a new pipeline */
  descr =
     g_strdup_printf ("videotestsrc horizontal-speed=5 ! imxvpuenc_h264 ! tee name=t t. ! queue  ! appsink name=sink caps=\"" CAPS "\"");

  pipeline = gst_parse_launch (descr, &error);

  if (error != NULL) {
    g_print ("could not construct pipeline: %s\n", error->message);
    g_clear_error (&error);
    exit (-1);
  }

  dec_pipeline = gst_parse_launch ("appsrc name=source caps=\"" CAPS "\" ! queue ! imxvpudec ! imx2dvideosink", &error);
  if (error != NULL) {
    g_print ("could not construct decoder pipeline: %s\n", error->message);
    g_clear_error (&error);
    exit (-1);
  }

  /* get sink and source from respective pipeline*/
  sink   = gst_bin_get_by_name (GST_BIN (pipeline), "sink");
  source = gst_bin_get_by_name (GST_BIN (dec_pipeline), "source");
  if( !source ) {
     g_print("Get source from pipeline is failed");
  }

  /* set to PAUSED to make the first frame arrive in the sink */
  ret = gst_element_set_state (pipeline, GST_STATE_PAUSED);
  switch (ret) {
    case GST_STATE_CHANGE_FAILURE:
      g_print ("failed to play the file\n");
      exit (-1);
    case GST_STATE_CHANGE_NO_PREROLL:
      /* for live sources, we need to set the pipeline to PLAYING before we can
       * receive a buffer. We don't do that yet */
      g_print ("live sources not supported yet\n");
      exit (-1);
    default:
      break;
  }

  gst_element_set_state (dec_pipeline, GST_STATE_PAUSED);
  g_print ("dec pipeline moved to pause state successfully\n");


  /* This can block for up to 5 seconds. If your machine is really overloaded,
   * it might time out before the pipeline prerolled and we generate an error. A
   * better way is to run a mainloop and catch errors there. */
  ret = gst_element_get_state (pipeline, NULL, NULL, 5 * GST_SECOND);
  if (ret == GST_STATE_CHANGE_FAILURE) {
    g_print ("failed to play the file\n");
    exit (-1);
  }

  ret    =  gst_element_set_state (pipeline, GST_STATE_PLAYING);
  sample =  gst_app_sink_pull_preroll(GST_APP_SINK(sink));
  //handle_sample_buffer(sample);

  gst_element_set_state (dec_pipeline, GST_STATE_PLAYING);
  buf = gst_sample_get_buffer (sample);

  g_print("Pushing buffer to app src\n");
  ret = gst_app_src_push_buffer(source, buf);
  if (ret == GST_FLOW_FLUSHING) {
      g_print ("appsrc is not paused\n");
  } else
  if (ret == GST_FLOW_EOS) {
      g_print("EOS occured\n");
  } else {
      g_print("Buffer is not queued successfully\n");
  }

  do {
      /* if we have a buffer now, convert it to a pixbuf. It's possible that we
       * don't have a buffer because we went EOS right away or had an error. */
       sample = gst_app_sink_pull_sample(GST_APP_SINK(sink));
       buf = gst_sample_get_buffer (sample); 
       //handle_sample_buffer(sample);
       ret = gst_app_src_push_buffer(source, buf);
     }while(1);

  /* cleanup and exit */
  gst_element_set_state (pipeline, GST_STATE_NULL);
  gst_object_unref (pipeline);
  gst_element_set_state (dec_pipeline, GST_STATE_NULL);
  gst_object_unref (dec_pipeline);

  exit (0);
}
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