How to implement video downloading and transcoding functions using PHP Kuaishou API interface

Use the PHP Kuaishou API interface to implement video downloading and transcoding functions

1. Introduction
Kuaishou is a very popular short video social application on which users can share their own short videos. video. During the development process, we may need to download videos from Kuaishou and transcode the downloaded videos. This article will introduce how to use the PHP Kuaishou API interface to implement video downloading and transcoding functions.

2. Download the video

1. Get video information
   First, we need to get the video information, including the video ID, size and duration. Video information can be obtained in the following ways:

$videoId = "xxxxxxxxxxxx"; // 视频ID
$access_token = "xxxxxxxxxxxx"; // 快手API的access_token

$url = "https://open.kuaishou.com/openapi/video/get";
$data = array(
    'video_id' => $videoId,
    'client_key' => 'xxxxxxxxxxxx', // 应用的client_key
    'access_token' => $access_token
);

$options = array(
    'http' => array(
        'header' => "Content-type:application/x-www-form-urlencoded
",
        'method' => 'POST',
        'content' => http_build_query($data),
    ),
);

$context = stream_context_create($options);
$result = file_get_contents($url, false, $context);
$result = json_decode($result, true);

$videoUrl = $result['result']['playUrl'];
$videoWidth = $result['result']['width'];
$videoHeight = $result['result']['height'];
$videoDuration = $result['result']['duration'] / 1000; // 毫秒转秒

2. Download video
   After obtaining the download link of the video, we can use the file_put_contents() function to download the video to local.

$videoName = "video.mp4"; // 视频保存的文件名

file_put_contents($videoName, file_get_contents($videoUrl));

3. Transcoding Video
Some videos may need to be transcoded, such as adjusting the video size, format, bit rate, etc. Here we use FFmpeg for video transcoding.

1. Installing FFmpeg
   In a Linux environment, you can install FFmpeg through the following command:

sudo apt-get install ffmpeg

In a Windows environment, you can download FFmpeg from the official website and install it.

2. Use FFmpeg to transcode

   $ffmpegPath = "/usr/bin/ffmpeg"; // FFmpeg的路径
   
   $outputName = "output.mp4"; // 输出的文件名
   $outputWidth = 640; // 输出视频的宽度
   $outputHeight = 480; // 输出视频的高度
   
   $cmd = $ffmpegPath . " -i " . $videoName . " -vf scale=" . $outputWidth . ":" . $outputHeight . " " . $outputName;
   
   exec($cmd);

   With the above code, the downloaded video can be transcoded according to the specified size and saved as new file.

   4. Summary
   This article introduces how to use the PHP Kuaishou API interface to implement video downloading and transcoding functions. By obtaining video information, downloading the video and using FFmpeg for transcoding operations, we can flexibly process video files on Kuaishou. Hope this article is helpful to you.

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