Technical Guide to Video Transcoding and Conversion in PHP

PHP is a commonly used server-side programming language. When developing websites and applications, it is sometimes necessary to transcode or convert videos so that they can be played on different devices and platforms. This article will introduce several video transcoding and conversion technologies in PHP for reference.

1. FFmpeg

FFmpeg is an open source video and audio processing tool that supports video transcoding and conversion in multiple formats. Using FFmpeg in PHP can be achieved by executing the command line. The following is an example of using FFmpeg to convert video to MP4 format:

$command = "/usr/local/bin/ffmpeg -i input.avi -codec:v libx264 -profile:v main -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -s 480x360 -threads 0 -codec:a aac -b:a 128k output.mp4";
exec($command);

The above command converts input.avi to the output MP4 format, and makes some parameter settings, such as video encoding type, video resolution, Audio encoding type, etc. Can be modified according to specific needs.

2. HandBrake

HandBrake is another popular video conversion tool that can also be called through PHP. HandBrake supports a variety of input and output formats and can perform operations such as video encoding, compression and conversion. Here is an example of using HandBrake to convert video to MKV format:

$command = "/usr/local/bin/HandBrakeCLI -i input.avi -o output.mkv --preset-import-file ./settings.json --preset "My Preset"";
exec($command);

The above command converts input.avi to the output MKV format and uses the preset conversion settings. settings.json is a JSON file containing a set of preset configurations that can be exported in HandBrake. Can be modified according to specific needs.

3. Zencoder

Zencoder is a cloud video processing service that can perform video transcoding, conversion and compression operations. Using Zencoder in PHP can be called through the API. The following is an example of using Zencoder to convert video to WebM format:

$job = Zencoder::jobs()->create([
        'input' => 's3://mybucket/myinputfile.avi',
        'outputs' => [
            [
                'label' => 'webm',
                'url' => 's3://mybucket/myoutputfile.webm',
                'format' => 'webm',
                'audio_codec' => 'vorbis',
                'video_codec' => 'vp8',
                'width' => 640,
                'height' => 360,
                'public' => true
            ]
        ]
    ]);

The above code uses Zencoder to create a video conversion task to convert the input file (s3://mybucket/myinputfile.avi) to the output file ( s3://mybucket/myoutputfile.webm) and use the preset WebM format for conversion. Can be modified according to specific needs.

Summary

The above introduces several techniques for video transcoding and conversion in PHP, including using tools such as FFmpeg, HandBrake and Zencoder. Each of these tools has its own characteristics, pros and cons, and can be chosen based on specific needs. Video transcoding and conversion is a very important function for developing websites and applications, which can improve user experience and playback effects while reducing server load and traffic consumption.

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