这是老版本的代码 我需要1.22.3的代码

抱歉，上一个答案给出的示例代码是使用 GStreamer 1.0 C++ API 实现 RTSP 拉流的通用示例代码，可以在较新的 GStreamer 版本中使用。以下是使用 GStreamer 1.22.3 版本的 C++ 代码示例：

#include <iostream>
#include <gst/gst.h>

int main(int argc, char *argv[]) {
    GstElement *pipeline, *source, *sink;
    GstBus *bus;
    GstMessage *msg;
    GstStateChangeReturn ret;

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

    /* Create the elements */
    source = gst_element_factory_make("rtspsrc", "source");
    sink = gst_element_factory_make("autovideosink", "sink");

    /* Create the empty pipeline */
    pipeline = gst_pipeline_new("test-pipeline");

    if (!pipeline || !source || !sink) {
        std::cerr << "Not all elements could be created." << std::endl;
        return -1;
    }

    /* Build the pipeline */
    gst_bin_add_many(GST_BIN(pipeline), source, sink, nullptr);
    if (gst_element_link(source, sink) != TRUE) {
        std::cerr << "Elements could not be linked." << std::endl;
        gst_object_unref(pipeline);
        return -1;
    }

    /* Set the URI to play */
    g_object_set(source, "location", "rtsp://example.com/stream", nullptr);

    /* Start playing */
    ret = gst_element_set_state(pipeline, GST_STATE_PLAYING);
    if (ret == GST_STATE_CHANGE_FAILURE) {
        std::cerr << "Failed to start playback." << std::endl;
        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, (GstMessageType)(GST_MESSAGE_ERROR | GST_MESSAGE_EOS));

    /* Parse message */
    if (msg != nullptr) {
        GError *err;
        gchar *debug_info;

        switch (GST_MESSAGE_TYPE(msg)) {
            case GST_MESSAGE_ERROR:
                gst_message_parse_error(msg, &err, &debug_info);
                std::cerr << "Error received from element " << GST_OBJECT_NAME(msg->src) << ": " << err->message << std::endl;
                std::cerr << "Debugging information: " << (debug_info ? debug_info : "none") << std::endl;
                g_clear_error(&err);
                g_free(debug_info);
                break;
            case GST_MESSAGE_EOS:
                std::cout << "End-Of-Stream reached." << std::endl;
                break;
            default:
                /* We should not reach here because we only asked for ERRORs and EOS */
                std::cerr << "Unexpected message received." << std::endl;
                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;
}

这个示例代码与之前的示例代码类似，只是使用了 C++11 的新特性，例如 nullptr 和 std::cout/std::cerr，但是与使用 GStreamer 1.0 API 的示例代码的逻辑相同。如果需要使用其他 GStreamer 插件或更高级的功能，请参考 GStreamer 官方文档。