gstreamer 相关问题

我使用命令 $ sudo apt install build-essential libpangoft2-1.0.0 在我的 debian 上安装了 pangoft2，并使用 $ sudo apt install build-essential gstreamer1.0-plugins-* 安装了 gstreamer 他们...

linux debian gstreamer gstreamer-1.0 pango

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我想编写OpenCV代码，将文本写入网络摄像头视频并使用Gst库发送UDP

我编写了这段代码并尝试了其他功能，但我无法实现这个场景。我该怎么办？问题出在代码、方法还是库中？ #包括 #包括我编写了这段代码并尝试了其他功能，但我无法实现这个场景。我该怎么办？问题出在代码、方法还是库中？ #include <gst/gst.h> #include <opencv2/opencv.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <gst/app/gstappsrc.h> int main(int argc, char* argv[]) { // Initialize GStreamer gst_init(&argc, &argv); // Create a GStreamer pipeline GstElement* pipeline = gst_parse_launch("v4l2src device=/dev/video0 ! videoconvert ! video/x-raw,format=BGR ! appsink", NULL); // Check if the pipeline was created successfully if (!pipeline) { g_print("Pipeline could not be created. Exiting.\n"); return -1; } // Set the pipeline state to playing GstStateChangeReturn ret = gst_element_set_state(pipeline, GST_STATE_PLAYING); if (ret == GST_STATE_CHANGE_FAILURE) { g_print("Unable to set the pipeline to the playing state. Exiting.\n"); return -1; } // OpenCV VideoCapture for video capture cv::VideoCapture cap; if (!cap.open("appsrc ! videoconvert ! video/x-raw, format=YUY2,width=640,height=480,framerate=25/1 ! jpegenc ! rtpjpegpay ! appsink ! udpsink host=192.168.1.14 port=5000")) { std::cerr << "Error: Could not open OpenCV VideoCapture." << std::endl; return -1; } cv::Mat frame; cv::Scalar text_color(0, 255, 0); // Text color (BGR) int font = cv::FONT_HERSHEY_SIMPLEX; double font_scale = 1.0; int font_thickness = 2; std::string text = "Hello, GStreamer!"; while (true) { if (!cap.read(frame)) { std::cerr << "Error: Could not read frame from OpenCV VideoCapture." << std::endl; break; } // Add text to the video frame using OpenCV cv::putText(frame, text, cv::Point(10, 50), font, font_scale, text_color, font_thickness); // Display the processed frame using OpenCV cv::imshow("Processed Frame", frame); cv::waitKey(1); // Convert the OpenCV frame to GStreamer format GstBuffer* buffer = gst_buffer_new_allocate(NULL, frame.total() * frame.elemSize(), NULL); GstMapInfo map_info; gst_buffer_map(buffer, &map_info, GST_MAP_WRITE); memcpy(map_info.data, frame.data, frame.total() * frame.elemSize()); gst_buffer_unmap(buffer, &map_info); // Push the frame into the GStreamer pipeline GstFlowReturn ret = gst_app_src_push_buffer(GST_APP_SRC(gst_bin_get_by_name(GST_BIN(pipeline), "appsrc")), buffer); if (ret != GST_FLOW_OK) { g_print("Error pushing frame to GStreamer pipeline. Exiting.\n"); break; } } // Clean up cv::destroyAllWindows(); gst_element_set_state(pipeline, GST_STATE_NULL); gst_object_unref(pipeline); return 0; } 我收到此错误：（gstremear_and_opencv_driver：19685）：GStreamer-CRITICAL **：15：24：59.492：gst_caps_get_struct：断言“GST_IS_CAPS（大写）”失败（gstremear_and_opencv_driver：19685）：GStreamer-CRITICAL **：15：24：59.492：gst_struct_get_int：断言“结构！= NULL”失败 [警告：[电子邮件受保护]]全局 cap_gstreamer.cpp:1707 打开 OpenCV | GStreamer 警告：无法查询视频宽度/高度（gstremear_and_opencv_driver：19685）：GStreamer-CRITICAL **：15：24：59.492：gst_struct_get_fraction：断言“结构！= NULL”失败 [警告：[电子邮件受保护]]全局 cap_gstreamer.cpp:1713 打开 OpenCV | GStreamer 警告：无法查询视频 fps [警告：[电子邮件受保护]]全局 cap_gstreamer.cpp:1728 打开 OpenCV | GStreamer 警告：无法查询视频位置：状态=0，值=-1，持续时间=-1 我尝试使用 opencv 在网络摄像头视频上编写文本并使用 udp gst 库发送。我不确定你的确切目标是什么，但假设你想从默认输出原始视频的相机 0 读取帧（否则使用 v4l2-ctl -d0 --list-formats-ext 并在捕获中的 v4l2src 之后指定视频上限管道），然后通过 UDP 覆盖一些文本和流结果作为 RTP/JPEG，然后你就可以做到这一点： 1。使用 gstreamer 从命令行： gst-launch-1.0 v4l2src device=/dev/video0 ! videoscale ! video/x-raw,width=640,height=480,pixel-aspect-ratio=1/1 ! videoconvert ! videorate ! video/x-raw,framerate=25/1 ! textoverlay text="Hello, Gstreamer" valignment=2 deltax=-200 color=4278255360 ! queue ! videoconvert ! video/x-raw,format=YUY2 ! jpegenc ! rtpjpegpay ! udpsink host=127.0.0.1 port=5000 2。或者使用 OpenCv，从 V4L 相机捕获到 OpenCv，以及用于流输出的编写器，例如： #include <opencv2/opencv.hpp> #include <opencv2/videoio.hpp> #include <opencv2/highgui.hpp> #include <opencv2/imgproc.hpp> int main(int argc, char* argv[]) { // Create OpenCV VideoCapture for reading video from camera cv::VideoCapture cap("v4l2src device=/dev/video0 ! videoscale ! video/x-raw,width=640,height=480,pixel-aspect-ratio=1/1 ! videoconvert ! video/x-raw,format=BGR ! videorate ! video/x-raw,framerate=25/1 ! appsink drop=1", cv::CAP_GSTREAMER); if (!cap.isOpened()) { std::cerr << "Error failed to open camera" << std::endl; return -1; } unsigned int width = (unsigned int) cap.get(cv::CAP_PROP_FRAME_WIDTH); unsigned int height = (unsigned int) cap.get(cv::CAP_PROP_FRAME_HEIGHT); double fps = cap.get(cv::CAP_PROP_FPS); std::cout << "Capture input opened, Ffaming: " << width << " x " << height << " @" << fps << " FPS" << std::endl; // OpenCV VideoWriter to RTP/JPG streaming to client 192.168.1.14 over UDP/5000 cv::VideoWriter streamer("appsrc ! queue ! video/x-raw,format=BGR ! videoconvert ! video/x-raw,format=YUY2 ! jpegenc ! rtpjpegpay ! udpsink host=192.168.1.14 port=5000", cv::CAP_GSTREAMER, 0, (float)fps, cv::Size(width, height)); if (!streamer.isOpened()) { std::cerr << "Error: Failed to open streamer writer." << std::endl; return -2; } std::cout << "streamer opened, ready for streaming to client 192.168.1.14 over UDP/5000" << std::endl; cv::Scalar text_color(0, 255, 0); // Text color (BGR) int font = cv::FONT_HERSHEY_SIMPLEX; double font_scale = 1.0; int font_thickness = 2; std::string text = "Hello, GStreamer!"; cv::Mat frame; while (true) { if (!cap.read(frame)) { std::cerr << "Error: Could not read frame from OpenCV VideoCapture." << std::endl; break; } // Add text to the video frame using OpenCV cv::putText(frame, text, cv::Point(10, 50), font, font_scale, text_color, font_thickness); streamer.write(frame); // Display the processed frame using OpenCV cv::imshow("Processed Frame", frame); cv::waitKey(1); } // Clean up cv::destroyAllWindows(); return 0; }

opencv gstreamer

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没有名为 gi 的模块

我已经尝试了下面给出的所有可能的命令： pip 安装 pgi 、 pip 安装 PyGObject 、 pip 安装 python-gi 仍然无法在 python 中安装该模块。安装了 python 3.7 也尝试一下...

python gstreamer python-module

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使用 GStreamer 和 souphttpsrc 播放 HLS 流（10 秒后失败）

以下管道在 10 秒后失败。 gst-launch-1.0 -v souphttpsrc location=https://test-streams.mux.dev/x36xhzz/x36xhzz.m3u8 ！ hlsdemux！解码器！视频转换！自动视频接收器对于某些人

gstreamer http-live-streaming

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Gstreamer splitmuxsink 在拆分时重置时间戳

我一直在使用 splitmuxsink 按长度或“立即分割”命令来分割实时视频流的录制。生成的视频文件都带有“全球时间&q...