How to develop a simple video processing function using MySQL and C++

How to use MySQL and C to develop a simple video processing function

Video processing has become one of the important applications in the field of modern technology. In this field, MySQL and C are also two commonly used tools. MySQL, as a relational database management system, can be used to store and manage large amounts of data, and C, as a widely used programming language, can be used to process and operate these data. This article will teach you how to use MySQL and C to develop a simple video processing function, and provide specific code examples.

1. Create MySQL database and table

First, we need to create a database in MySQL and create a table in it to store the video information. You can use MySQL's command line tools or GUI tools (such as phpMyAdmin) to complete this step. The following is an example database and table creation command:

CREATE DATABASE videodb;
USE videodb;

CREATE TABLE videos (
   id INT PRIMARY KEY AUTO_INCREMENT,
   title VARCHAR(100),
   duration INT,
   resolution VARCHAR(20),
   file_path VARCHAR(200)
);

This table contains information such as the video's id, title, duration, resolution, and file path.

2. Connect to MySQL database

To use the MySQL database in C, we need to use the C API provided by MySQL. First, you need to install MySQL Connector/C, then include the corresponding header files and link the corresponding library files. Here is a simple code example to connect to a MySQL database:

#include <mysql_driver.h>
#include <mysql_connection.h>

int main() {
   sql::mysql::MySQL_Driver *driver;
   sql::Connection *con;

   driver = sql::mysql::get_mysql_driver_instance();
   con = driver->connect("tcp://127.0.0.1:3306", "username", "password");

   // 连接成功后的操作...

   delete con;

   return 0;
}

In this example, you need to replace the username and password with the correct MySQL username and password, and then use the correct MySQL server address and port.

3. Add video

Next, we need to write code to add video information to the MySQL database. The following is a simple code example:

sql::Statement *stmt;
stmt = con->createStatement();
stmt->execute("INSERT INTO videos(title, duration, resolution, file_path) VALUES('Video 1', 120, '1920x1080', '/path/to/video1.mp4')");

delete stmt;

In this example, we insert a video information into the videos table, including title, duration, resolution and file path. You can modify the code according to your own needs and insert multiple pieces of video information in batches in a loop.

4. Query video

We can also write code to query video information in the database. The following is a simple code example:

sql::ResultSet *res;
stmt = con->createStatement();
res = stmt->executeQuery("SELECT * FROM videos");

while (res->next()) {
   std::cout << "ID: " << res->getInt("id") << std::endl;
   std::cout << "Title: " << res->getString("title") << std::endl;
   std::cout << "Duration: " << res->getInt("duration") << std::endl;
   std::cout << "Resolution: " << res->getString("resolution") << std::endl;
   std::cout << "File Path: " << res->getString("file_path") << std::endl;
}

delete res;
delete stmt;

In this example, we query all video information in the videos table and print out the results. The query conditions can be modified as needed to achieve more precise queries.

5. Other video processing operations

In addition to adding and querying video information, we can also use C to implement other video processing operations. For example, you can use the FFmpeg library to implement video interception, editing, transcoding and other operations. The following is a simple sample code:

#include <iostream>
#include <libavformat/avformat.h>
#include <libavutil/imgutils.h>
#include <libavutil/error.h>

int main() {
   // 初始化FFmpeg库
   av_register_all();

   // 打开视频文件
   AVFormatContext *fmt_ctx = nullptr;
   int ret = avformat_open_input(&fmt_ctx, "/path/to/video.mp4", nullptr, nullptr);
   if (ret < 0) {
      char err_msg[AV_ERROR_MAX_STRING_SIZE]{};
      av_make_error_string(err_msg, AV_ERROR_MAX_STRING_SIZE, ret);
      std::cout << "Failed to open video file: " << err_msg << std::endl;
      return ret;
   }

   // 其他视频处理操作...

   avformat_close_input(&fmt_ctx);

   return 0;
}

In this example, we use the FFmpeg library to open a video file, and can add specific processing code in the "Other Video Processing Operations" section. You can find more functions and sample codes about video processing in FFmpeg's official documentation.

Summary:

By combining MySQL and C, we can easily develop a simple video processing function. From creating databases and tables, to adding and querying video information, to implementing other video processing operations, we demonstrate the entire development process with specific code examples. I hope this article can be helpful to your development in video processing.

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