How can one use Laravel FFMpeg to change an mp3 file into an mp4 file?

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To use Laravel FFMpeg to change an mp3 file into an mp4 file, follow the steps below:

1. Install Laravel FFMpeg by running the following command from terminal in your Laravel project directory:

composer require pbmedia/laravel-ffmpeg

1. Require the FFMpeg facade by adding this code to your config/app.php file under the aliases array:

'Aliases' => [
     // other aliases
     'FFMpeg' => 'ProtoneMedia\LaravelFFMpeg\Support\FFMpegFacade'
]

1. Use FFMpeg to convert the mp3 file to mp4 by adding the code below to your controller method:

use FFMpeg;

//input mp3 file path
$inputPath = '/path/to/input/file.mp3';

//output mp4 file path
$outputPath = '/path/to/output/file.mp4';

//initialize FFMpeg
$ffmpeg = FFMpeg::create();

//open the input file
$audio = $ffmpeg->open($inputPath);

//convert it to video
$format = new \FFMpeg\Format\Video\X264();
$format->setAudioCodec("libmp3lame");
$video = $ffmpeg->getFFMpegDriver()->pipe($audio, $format);

//save to output file
file_put_contents($outputPath, $video);

1. Run this controller method to convert the mp3 file to mp4. The converted file will be saved in the specified output path.

Note: Changing an audio file to a video file doesn't add any video to the file. The resulting video will be a still image with the audio playing.