• 操作系统：ubuntu22.04
• OpenCV版本：OpenCV4.9
• IDE:Visual Studio Code
• 编程语言：C++11

算法描述

getBackendName() 是一个成员函数，用于获取当前使用的视频编解码器后端的名称。这个函数可以帮助开发者了解正在使用的编解码器是什么，这对于调试和兼容性检查非常有用。

函数原型

String cv::VideoWriter::getBackendName	()	const

参数

此函数不接受任何参数

返回值

getBackendName() 函数返回一个字符串，表示当前使用的视频编解码器的名称。例如，对于 XVID 编码器，返回值可能是 “XVID” 或者 “xvid”（具体取决于实现）。

代码示例

#include <iomanip>
#include <iostream>
#include <opencv2/opencv.hpp>
#include <fstream>int main()
{// 设置视频的宽度和高度int frameWidth  = 640;int frameHeight = 480;// 设置视频编码器的 FourCC 代码// 使用 XVID 编码器作为替代方案int fourcc = cv::VideoWriter::fourcc( 'X', 'V', 'I', 'D' );// 创建 VideoWriter 对象cv::VideoWriter writer( "output.avi",                         // 输出视频文件名fourcc,                               // 视频编码器的 FourCC 代码25,                                   // 帧率（每秒帧数）cv::Size( frameWidth, frameHeight ),  // 帧大小true                                  // 是否为彩色视频);if ( !writer.isOpened() ){std::cerr << "Failed to initialize the video writer." << std::endl;return -1;}// 获取编解码器名称std::string backendName = writer.getBackendName();// 打印属性值std::cout << "Initial Properties:" << std::endl;std::cout << "VideoWriter Frame Width: " << writer.get( cv::CAP_PROP_FRAME_WIDTH ) << std::endl;std::cout << "VideoWriter Frame Height: " << writer.get( cv::CAP_PROP_FRAME_HEIGHT ) << std::endl;std::cout << "FPS: " << writer.get( cv::CAP_PROP_FPS ) << std::endl;std::cout << "FourCC Code: " << writer.ge`在这里插入代码片`t( cv::CAP_PROP_FOURCC ) << std::endl;std::cout << "Backend Name: " << backendName << std::endl;// 创建一个示例帧cv::Mat frame = cv::Mat::zeros( frameHeight, frameWidth, CV_8UC3 );// 写入一帧到视频文件writer.write( frame );// 再次获取属性值，看看是否有变化std::cout << "After writing a frame:" << std::endl;std::cout << "VideoWriter Frame Width: " << writer.get( cv::CAP_PROP_FRAME_WIDTH ) << std::endl;std::cout << "VideoWriter Frame Height: " << writer.get( cv::CAP_PROP_FRAME_HEIGHT ) << std::endl;std::cout << "FPS: " << writer.get( cv::CAP_PROP_FPS ) << std::endl;std::cout << "FourCC Code: " << writer.get( cv::CAP_PROP_FOURCC ) << std::endl;std::cout << "Backend Name: " << writer.getBackendName() << std::endl;// 检查视频文件是否存在std::ifstream file( "output.avi" );if ( file.good() ){std::cout << "Video file created successfully." << std::endl;}else{std::cerr << "Failed to create video file." << std::endl;}// 关闭文件流file.close();// 释放资源writer.release();return 0;
}

运行结果

Initial Properties:
VideoWriter Frame Width: 0
VideoWriter Frame Height: 0
FPS: 0
FourCC Code: 0
Backend Name: FFMPEG
After writing a frame:
VideoWriter Frame Width: 0
VideoWriter Frame Height: 0
FPS: 0
FourCC Code: 0
Backend Name: FFMPEG
Video file created successfully.