gpt4 book ai didi

c - 在 gstreamer 中向管道添加过滤器失败

转载 作者:太空宇宙 更新时间:2023-11-04 02:08:23 51 4
gpt4 key购买 nike

我正在此处尝试在基本 GStreamer 教程结束时进行练习:Basic Tutorial 2 .练习只是为视频添加过滤器。练习说要简单地添加“vertigoTV”效果,所以我就这样做了。

以下是我尝试的相关部分:

    #include <gst/gst.h>

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

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

/* Create the elements */
source = gst_element_factory_make ("videotestsrc", "source");
filter = gst_element_factory_make ("vertigotv", "filter");
sink = gst_element_factory_make ("autovideosink", "sink");

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

if (!pipeline || !source || !filter || !sink) {
g_printerr ("Not all elements could be created.\n");
return -1;
}

/* Build the pipeline */
gst_bin_add_many (GST_BIN (pipeline), source, filter, sink, NULL);
if (gst_element_link_many (source, filter, sink, NULL) != TRUE) {
g_printerr ("Could not link all elements.\n");
gst_object_unref (pipeline);
return -1;
}

/* Modify the source's properties */
g_object_set (source, "pattern", 0, NULL);

/* Start playing */
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;
}

/* 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);

/* 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: %s\n", GST_OBJECT_NAME (msg->src), err->message);
g_printerr ("Debugging information: %s\n", 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);
}

/* Free resources */
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}

但是,返回值是 GST_STATE_CHANGE_FAILURE。知道为什么吗?

非常感谢!

最佳答案

在过滤器之后添加一个 videoconvert:

gst-launch-1.0 videotestsrc ! vertigotv ! videoconvert ! autovideosink

关于c - 在 gstreamer 中向管道添加过滤器失败,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18023497/

51 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com