How to implement dynamic watermark effect on video in PHP?

How to achieve dynamic watermark effect on video in PHP?

Dynamic watermark is an effect that adds text or images to a video and plays an important role in information transmission and copyright protection. In PHP, we can use the FFmpeg library to process and edit videos. The following will introduce how to use PHP and FFmpeg to achieve dynamic watermark effects on videos.

First, make sure FFmpeg is installed on your server. If it is not installed, you can install it through the following command:

sudo apt-get install ffmpeg

Next, we will use PHP's exec function to call the command line to perform FFmpeg operations. The following is a sample code:

$videoPath = "path/to/video.mp4";
$watermarkPath = "path/to/watermark.png";
$outputPath = "path/to/output.mp4";
$text = "Watermark Text";
$fontPath = "path/to/font.ttf";

// 添加文本水印
$command = "ffmpeg -i $videoPath -vf 'drawtext=text='$text':fontfile=$fontPath:fontsize=24: fontcolor=white:x=(w-text_w-10):y=(h-text_h-10)' -codec:a copy $outputPath";
exec($command);

// 添加图像水印
$command = "ffmpeg -i $videoPath -i $watermarkPath -filter_complex 'overlay=W-w-10:H-h-10' -codec:a copy $outputPath";
exec($command);

The above code is divided into two parts, namely adding text watermark and adding image watermark. First, we need to specify the path of the video file and the path of the output file. Then, use FFmpeg’s command line options to edit the video. When adding a text watermark, we used the drawtext filter to draw the text and set parameters such as font, size, color, and position. When adding an image watermark, we used the overlay filter to overlay the image and control the position.

When adding a text watermark, you need to replace the path of the font file .ttf with your own font file path. Similarly, when adding an image watermark, you need to replace the path of the watermark image with your own watermark image path. In addition, you can customize the text content, font size and color according to your needs.

Next, we can call the above code in PHP to achieve the dynamic watermark effect of the video. For example, you can upload a video file and watermark image in an HTML form, and use PHP to process the video and add a watermark when submitting the form:

if(isset($_POST['submit'])) {
    $videoName = $_FILES['video']['name'];
    $videoTemp = $_FILES['video']['tmp_name'];

    $watermarkName = $_FILES['watermark']['name'];
    $watermarkTemp = $_FILES['watermark']['tmp_name'];

    $targetDir = "path/to/uploads/";
    $videoPath = $targetDir . $videoName;
    $watermarkPath = $targetDir . $watermarkName;

    move_uploaded_file($videoTemp, $videoPath);
    move_uploaded_file($watermarkTemp, $watermarkPath);

    $outputPath = $targetDir . "output.mp4";

    // 添加水印
    // ...

    // 显示结果
    echo "视频添加水印成功！";
    echo "<a href='$outputPath'>点击下载水印视频</a>";
}

In the above code, we first obtain the uploaded video file and watermark image , and save them to the specified directory on the server. We then pass the path to the previous code example to add the watermark. Finally, we display the processed results and provide a download link.

In summary, using PHP and FFmpeg libraries can easily achieve dynamic watermark effects on videos. With a simple code example, we can add text watermark or image watermark as required and apply it to the uploaded video file. Whether in information transmission or copyright protection, dynamic watermarks play an important role, allowing us to better protect and customize our video content.

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