GSTREAMER - 将命令行转换为 C 代码

Question

我有以下管道可以正常工作：

gst-launch-1.0 -v tcpclientsrc host=192.168.1.132 port=5000  ! gdpdepay !  rtph264depay ! avdec_h264 ! videoconvert ! autovideosink

我想写一个C程序来做同样的事情。

我将之前的管道转换为以下代码，但视频无法启动（帮助我）

#include <gst/gst.h>
int main(int argc, char *argv[]) {
    GstBus *bus;
    GstMessage *msg;
    GstStateChangeReturn ret;
    /* Initialize GStreamer */
    gst_init (&argc, &argv);
    GError *error = NULL;
    GstElement *pipeline = gst_parse_launch("tcpserversrc name=src ! gdpdepay ! rtph264depay ! avdec_h264 !videoconvert ! autovideosink", &error);
    if (!pipeline) {
         g_print ("Parse error: %sn", error->message);
         exit (1);
    }
    GstElement *src = gst_bin_get_by_name(GST_BIN(pipeline), "src");
    g_object_set(src, "host", "192.168.1.132","port",5000, NULL);

开始玩

    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;
    }else {
         g_printerr("ERROR PLAYn");
    }

等到错误或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: %sn", GST_OBJECT_NAME (msg->src), err->message);
                g_printerr ("Debugging information: %sn", 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);
    }

免费资源

    gst_object_unref (bus);
    gst_element_set_state (pipeline, GST_STATE_NULL);
    gst_object_unref (pipeline);
    return 0;
}

Answer 1

我找不到任何明显的东西。您是否尝试过使用 GST_DEBUG="*：2" ./myapp 运行以查看是否有一些警告

Answer 2

gdppay/gdpdepay目前未移植到iOS 1.2库中。我已经读过它应该包含在 1.3 - 1.4 版本中。我猜这就是问题所在。