我正在开展一个项目,该项目将通过摄像机的运动检测触发事件。我有以下gst-launch-1.0命令可以正常工作:
gst-launch-1.0 rtspsrc location=rtsp://user:pass@10.10.40.200/live.sdp ! rtph264depay ! h264parse ! avdec_h264 ! video/x-raw ! videoconvert ! motioncells ! videoconvert ! xvimagesink
并尝试使用以下代码重新创建它:
#include <gst/gst.h>
#include <glib.h>
#include <glib/gprintf.h>
/*Structure to contain info so that we can pass it to callback*/
typedef struct _CustomData{
GstElement *pipeline;
GstElement *source;
GstElement *depay;
GstElement *parse;
GstElement *decode;
GstElement *capsf;
GstElement *conv1;
GstElement *mcells;
GstElement *conv2;
GstElement *sink;
GstElement *fsink;
GstElement *fsource;
} CustomData;
int main(int argc, char *argv[]){
CustomData data;
GstBus *bus;
GstMessage *msg;
GstStateChangeReturn ret;
gboolean terminate = FALSE;
GstCaps *caps;
/*init gstreamer*/
gst_init(&argc, &argv);
/*create elements*/
data.source = gst_element_factory_make("rtspsrc","source");
data.depay = gst_element_factory_make("rtph264depay","depay");
data.parse = gst_element_factory_make("h264parse","parse");
data.decode = gst_element_factory_make("avdec_h264","decode");
data.capsf = gst_element_factory_make("capsfilter", "capsf");
data.conv1 = gst_element_factory_make("videoconvert","conv1");
data.mcells = gst_element_factory_make("motioncells","mcells");
data.conv2 = gst_element_factory_make("videoconvert", "conv2");
data.sink = gst_element_factory_make("xvimagesink", "sink");
//create pipeline
data.pipeline = gst_pipeline_new("mcells-pipeline");
if(!data.pipeline || !data.source || !data.depay || !data.parse || !data.decode || !data.capsf || !data.conv1 || !data.mcells || !data.conv2 || !data.sink){
g_printerr("Not all elements created\n");
return -1;
}
//set rtsp src
g_object_set(G_OBJECT (data.source), "location", argv[1], NULL);
//set capsf
caps = gst_caps_from_string("video/x-raw");
g_object_set(G_OBJECT(data.capsf), "caps", caps, NULL);
//build the pipeline
gst_bin_add_many(GST_BIN(data.pipeline), data.source, data.depay, data.parse, data.decode, data.capsf, data.conv1, data.mcells , data.conv2, data.sink, NULL);
gst_element_link_many(data.source, data.depay, data.parse, data.decode, data.capsf, data.conv1, data.mcells, data.conv2, data.sink, NULL);
g_print ("Now playing\n");
gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
g_print ("Running...\n");
bus = gst_element_get_bus(data.pipeline);
while (!terminate){
msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
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);
terminate = TRUE;
break;
case GST_MESSAGE_EOS:
g_print ("End-Of-Stream reached.\n");
terminate = TRUE;
break;
case GST_MESSAGE_STATE_CHANGED:
/* We are only interested in state-changed messages from the pipeline */
if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data.pipeline)) {
GstState old_state, new_state, pending_state;
gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
g_print ("Pipeline state changed from %s to %s:\n",
gst_element_state_get_name (old_state), gst_element_state_get_name (new_state));
}
break;
default:
/* We should not reach here */
g_printerr ("Unexpected message received.\n");
break;
}
gst_message_unref (msg);
}
}
gst_element_set_state (data.pipeline, GST_STATE_NULL);
gst_object_unref (data.pipeline);
return 0;
}
此代码导致错误:
Pipeline state changed from NULL to READY:
Pipeline state changed from READY to PAUSED:
Error received from element udpsrc1: Internal data flow error.
Debugging information: gstbasesrc.c(2865): gst_base_src_loop (): /GstPipeline:mcells-pipeline/GstRTSPSrc:source/GstUDPSrc:udpsrc1:
streaming task paused, reason not-linked (-1)
这里有没有人遇到过类似的错误,可以指出我哪里出错?
感谢。
答案 0 :(得分:2)
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src-pad并不总是可用,所以你不能正确链接其他元素,直到它发出一个&#34; pad-added&#34;事件,你可以在&#34;动态(或有时)垫上找到你需要的所有东西&#34;以下部分的一节:
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-pads.html