Question

我已多次运行此代码，试图弄清楚它为什么不起作用。我从IP摄像头获取信息。该程序遍历每个程序，但它无法播放。最初的开始是

gst-launch-1.0 udpsrc address = [ip] port = [port]！ application / x-rtp，clock-rate = 10，media = video！ rtpmp4vdepay！ decodebin！ d3dvideosink

我使用了gst_parse_launch（）并且可以工作，但由于某种原因不能玩。我一直在想弄清楚我做错了什么。 convertString.h只是将Char *端口抛出到将字符串转换为int的方法。我不想使用gst_parse_launch（）因为我想用它来覆盖应用程序。

有人知道我错过了什么吗？

#include <gst/gst.h>
#include <gst/video/videooverlay.h>
#include <stdio.h>
#include <string.h>
#include "convertString.h"
#include <Windows.h>
#include <direct.h>

void nullvalues(GstElement*,GstBus*,GstMessage*);

int main(int argc, char *argv[]) 
{

GstElement *pipeline,*sink,*source, *rtppay,*filter1,*decodebin;
GstCaps *filtercaps;
GstBus *bus;
GstMessage *msg;
gboolean link_ok = FALSE;
GstStateChangeReturn ret;
char *ip_address = [ip];
char *port = [port];
char *window_handle = "";
char *title = "";
int wid;
char *sourcestring = "";
#define url_size 28
char url[url_size];
strcpy_s(url,url_size,"");


while ((argc > 1) && (argv[1][0] == '-'))
{
     switch (argv[1][1])
     {
        case 'i':
            ip_address = &argv[1][2];
            break;

        case 'p':
            port = &argv[1][2];
            break;
        case 'w':
            window_handle = &argv[1][2];
            break;
        case 't':
            title = &argv[1][2];
            break;
    }

    ++argv;
    --argc;
}

strcat_s(url,url_size,"udp://");
strcat_s(url,url_size,ip_address);
strcat_s(url,url_size,":");
strcat_s(url,url_size,port);

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


/* Build Pipeline */

if(title != "")
pipeline = gst_pipeline_new (title);
else
    pipeline = gst_pipeline_new("My pipeline");

source = gst_element_factory_make ("udpsrc","source");

filter1 = gst_element_factory_make("capsfilter","filter");

rtppay = gst_element_factory_make( "rtpmp4vdepay", "depayl");

decodebin = gst_element_factory_make ("decodebin","decode");

sink = gst_element_factory_make ("d3dvideosink", "sink");

gst_bin_add_many (GST_BIN (pipeline),source,filter1,rtppay,decodebin,sink, NULL);

filtercaps = gst_caps_new_simple("application/x-rtp","clock-rate",G_TYPE_INT,10,"media",G_TYPE_STRING,"video",NULL);

g_object_set(GST_OBJECT(source),"address",ip_address,NULL);
g_object_set(GST_OBJECT(source),"port",StringToInt(port),NULL);

g_object_set (G_OBJECT (filter1), "caps",filtercaps,NULL);
gst_caps_unref(filtercaps);

link_ok = gst_element_link_many(source,filter1,rtppay,decodebin,sink);
if(!link_ok)
  printf("%s\nNOPE\n");

/* Start playing */
ret = gst_element_set_state (pipeline, GST_STATE_READY);
if(ret == GST_STATE_CHANGE_FAILURE)
printf("\nFailed\n");
else if(ret == GST_STATE_CHANGE_SUCCESS)
printf("\nSuccess\n");

/* 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);

/* 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);
printf("\nDone\n");
return 0;
}

Answer 1

如果gst_parse_launch（）正在为你工作，我建议你使用它。您仍然可以在应用程序中覆盖d3dvideosink。

只需在管道定义中为d3dvideosink元素使用唯一名称（例如“d3dvideosink name = myvideosink”）。

通过gst_bin_get_by_name（）从管道获取d3dvideosink的句柄。此句柄也应支持GstVideoOverlay界面，您可以通过gst_video_overlay_set_window_handle（）设置叠加。

Answer 2

使用它将解决问题 Gstreamer Decodebin

gstreamer 1.0 sdk应用程序捕获RTP视频问题

2 个答案: