PHP calls the camera to record time-lapse video: simple tutorial sharing

PHP calls the camera to record time-lapse video: simple tutorial sharing

The application of the camera has become more and more widespread. In addition to live broadcast and taking photos, it can also be used to record time-lapse video. Time-lapse video displays a time-accelerated effect by playing a series of consecutive pictures at a lower frame rate. In this article, we will share a simple tutorial on how to use PHP to call the camera and record time-lapse video.

1. Configuring the camera

First, we need to make sure that the camera has been configured correctly. In Linux systems, you can use command line tools to check and configure the camera. Run the following command to view the available camera devices in the system:

ls -l /dev/video*

If the output contains a device similar to /dev/video0, it means that there are available cameras in the system. If the device is not found, check that the camera is plugged in correctly and that the correct driver is installed.

2. Install necessary software packages

Before using PHP to call the camera, we also need to install some necessary software packages. Run the following command to install the corresponding package:

sudo apt-get install ffmpeg fswebcam

3. PHP Calling the Camera

Next, we start writing PHP code to call the camera and record the time-lapse video. First, we need to use the shell_exec function to perform command line operations.

The following is a simple sample code that demonstrates how to use PHP to call the camera and record a time-lapse video:

<?php

// 设置时间间隔和记录总帧数
$interval = 1; // 每隔1秒拍摄一张照片
$total_frames = 60; // 总共拍摄60张照片

// 定义保存照片的目录
$photos_dir = '/path/to/photos'; // 这里的路径需要替换成你的实际路径

// 创建保存照片的目录
if (!is_dir($photos_dir)) {
    mkdir($photos_dir, 0755, true);
}

// 循环拍摄照片
for ($i = 1; $i <= $total_frames; $i++) {
    $photo_file = $photos_dir . '/photo' . $i . '.jpg'; // 图片文件名
    $command = 'fswebcam -r 640x480 --no-banner ' . $photo_file; // 调用摄像头拍照的命令
    shell_exec($command);
    sleep($interval); // 等待指定时间间隔
}

// 将照片合成为时间-lapse视频
$video_file = '/path/to/video.mp4'; // 这里的路径需要替换成你的实际路径
$command = 'ffmpeg -framerate 24 -pattern_type glob -i "' . $photos_dir . '/*.jpg" -c:v libx264 -pix_fmt yuv420p ' . $video_file;
shell_exec($command);

// 删除拍摄的照片
array_map('unlink', glob($photos_dir . '/*.jpg'));
rmdir($photos_dir);

?>

In the above code, we first set the time interval and the total number of recorded frames. Then, a directory is created to save the photos, and a loop is used to call the camera to take photos through the fswebcam command. After each shot, the program waits for the specified time interval. After completing the shooting, we use the ffmpeg command to synthesize the photos into a time-lapse video and save it to the specified file. Finally, we also deleted the photos we took.

4. Run the code

Save the above code as a PHP file and replace the path with the actual path. Then, run the PHP file through a browser or command line to start shooting time-lapse video.

Summary

By using PHP to call the camera and record time-lapse video, we can implement a simple and effective method on the server side. Using the acceleration effect of time-lapse video, we can record and display a series of slowly changing but interesting scenes, such as sunset, cloud movement, flower blooming, etc. I hope this article will be helpful to use PHP to call the camera to record time-lapse video.

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