[英]Failure adding filter to pipeline in gstreamer
我正在嘗試在Basic GStreamer教程結束時進行練習: 基礎教程2 。 練習僅僅是為視頻添加過濾器。 練習說只是添加“vertigoTV”效果,所以我這樣做了。
以下是我嘗試的相關部分:
#include <gst/gst.h>
int main(int argc, char *argv[]) {
GstElement *pipeline, *source, *filter, *convert, *sink;
GstBus *bus;
GstMessage *msg;
GstStateChangeReturn ret;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Create the elements */
source = gst_element_factory_make ("videotestsrc", "source");
filter = gst_element_factory_make ("vertigotv", "filter");
sink = gst_element_factory_make ("autovideosink", "sink");
/* Create the empty pipeline */
pipeline = gst_pipeline_new ("test-pipeline");
if (!pipeline || !source || !filter || !sink) {
g_printerr ("Not all elements could be created.\n");
return -1;
}
/* Build the pipeline */
gst_bin_add_many (GST_BIN (pipeline), source, filter, sink, NULL);
if (gst_element_link_many (source, filter, sink, NULL) != TRUE) {
g_printerr ("Could not link all elements.\n");
gst_object_unref (pipeline);
return -1;
}
/* Modify the source's properties */
g_object_set (source, "pattern", 0, NULL);
/* Start playing */
ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Unable to set the pipeline to the playing state.\n");
gst_object_unref (pipeline);
return -1;
}
/* 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);
/* Parse message */
if (msg != NULL) {
GError *err;
gchar *debug_info;
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR:
gst_message_parse_error (msg, &err, &debug_info);
g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
g_clear_error (&err);
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);
return 0;
}
但是,返回值是GST_STATE_CHANGE_FAILURE。 知道為什么嗎?
非常感謝!
過濾后添加視頻轉換:
gst-launch-1.0 videotestsrc ! vertigotv ! videoconvert ! autovideosink
這肯定會奏效,我已經嘗試過並且正常運行。
請嘗試其他一些步驟或添加您得到的確切錯誤。 您可能還想發布完整的代碼。
PS - 希望將此添加為評論,但未達到2個代表
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