我是 gstreamer 的新手，正在尝试开发一个用于字幕解码的示例插件。
我已经下载了 gStreamer 插件模板：基于此信息。
当我从命令行启动插件时，它工作正常。
我编写了一个示例应用程序来验证插件。但是现在，我在将管道状态设置为 PLAYING 时遇到了问题。下面是代码片段
任何输入都会有很大帮助。
在此先感谢，克兰蒂
gst_init(NULL, NULL);
loop = g_main_loop_new (NULL, TRUE);
g_print("\n Gstreamer is Initialized and Created the loop ");
pipeline = gst_pipeline_new ("pipeline");
source = gst_element_factory_make ("filesrc", "source");
filter = gst_element_factory_make ("myfilter", "testfilter");
sink = gst_element_factory_make ("fakesink", "sink");
if((NULL != pipeline) && (NULL != source) && (NULL != filter) && (NULL != sink))
{
g_print("\n Successfully created the factory elements ");
g_object_set(G_OBJECT (source), "location", fileName, NULL);
g_print("\n Set the file name \n");
g_object_set(G_OBJECT (filter), "silent", 1, NULL);
g_print("\n Set the silent type \n");
/* we add a message handler */
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
bus_watch_id = gst_bus_add_watch (bus, bus_call, loop);
gst_object_unref (bus);
g_print("\n Created bus and a monitor to watch it");
gst_bin_add_many(GST_BIN(pipeline), source, filter, sink, NULL);
gst_element_link_many(source, filter, sink);
g_print("\n Added and Linked the factory elements");
g_signal_connect (filter, "pad-added", G_CALLBACK (on_pad_added), filter);
g_print ("Now reading: %s\n", "test.txt");
g_print ("Setting the pipeline state to PLAYING ");
ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
if(ret == GST_STATE_CHANGE_FAILURE)
{
g_print("\n Failure in setting pipeline state to PLAYING \n");
}
else
{
g_print("\n Successfully set the pipeline state to playing \n");
}
}
else
{
g_print("\n Failure in creating factory elements");
}