Gstreamer:为什么我不能在本地主机上通过UDP发送数据?

Gstreamer: why can't I send data over UDP on localhost?

本文关键字:UDP 数据 主机 为什么 不能 Gstreamer      更新时间:2023-10-16

我试图在本地主机上测试udp流,但它没有显示任何内容:

videotestsrc (or audiotestsrc) -> udpsink (port: 5078, host: 127.0.0.1)

代码如下:

console_out_inf("TESTING", "Starting work with test elements");
gint port = 5078;
// TEST PIPELINE OUT
gst_bin_add_many(GST_BIN(GSD->pipetest_out), GSD->testsrc, GSD->udpsink, NULL);
gchar* host = "127.0.0.1";
g_object_set(GSD->udpsink, "port", port, NULL);
g_object_set(GSD->udpsink, "host", host, NULL);
if (!gst_element_link(GSD->testsrc, GSD->udpsink))
    console_out_bad("STREAMING", "Error linking test udp elements -- SEND");
else
    console_out_yes("STREAMING", "Correctly linked test udp elements -- SEND");
// TEST PIPELINE IN
gst_bin_add_many(GST_BIN(GSD->pipetest_in), GSD->udpsrc, GSD->autovideosink, NULL);
gst_element_set_state(GSD->udpsrc, GST_STATE_NULL);
g_object_set(GSD->udpsrc, "port", port, NULL);
if (!gst_element_link(GSD->udpsrc, GSD->autovideosink))
    console_out_bad("STREAMING", "Error linking test udp elements -- RECEIVE");
else
    console_out_yes("STREAMING", "Correctly linked test udp elements -- RECEIVE");
// PLAY TEST PIPELINE OUT
GstStateChangeReturn ret1;
ret1 = gst_element_set_state(GSD->pipetest_out, GST_STATE_PLAYING);
if (ret1 == GST_STATE_CHANGE_FAILURE)
    console_out_bad("TESTING", "Failed playing pipetest out");
else
    console_out_yes("TESTING", "Correctly played pipetest out");
// PLAY TEST PIPELINE IN
GstStateChangeReturn ret2;
ret2 = gst_element_set_state(GSD->pipetest_in, GST_STATE_PLAYING);
if (ret2 == GST_STATE_CHANGE_FAILURE)
    console_out_bad("TESTING", "Failed playing pipetest in");
else
    console_out_yes("TESTING", "Correctly played pipetest in");
// PRINT PIPELINES
GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(GSD->pipetest_out), GST_DEBUG_GRAPH_SHOW_ALL, "pipetest_out");
GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(GSD->pipetest_in), GST_DEBUG_GRAPH_SHOW_ALL, "pipetest_in");

这是"我自己的控制台输出":

EDIT:不相关了!一切都很好地实例化了,管道构建正确,但是

PIPELINE OUT: videotestsrc -> udpsink (host:127.0.0.1, port: 5078)

PIPELINE IN: udpsrc (port: 5078) -> autovideosink

autovideosink不显示任何内容!通过检查netstat -a,该端口上没有显示任何连接。

附加信息:

  1. 使用"gstreamer debugging"生成的图形当然只包含连接到udpsink的视频/音频testsrc元素。
  2. 我第一次运行代码,"Windows防火墙窗口"出现了,所以我猜有东西正在发送/接收。
  3. 这是在Visual Studio 2013/Qt5 Add-In项目中,但这不应该是一个问题

有人知道我做错了什么吗?

这段代码看起来很好,但它与您发布的控制台输出无关。

尝试使用命令行gst-launch:

逐个测试管道
gst-launch-1.0 -e -v videotestsrc ! udpsink host="127.0.01"

首先连接到一个伪链接,然后在udp接收器中交换,一旦你让它在命令行中工作,在代码中镜像命令。

尝试host="localhost"或host="192.168.0.1"我不记得了,但我认为udpsink可能在发送到环回时遇到麻烦