How to convert mp3 to mp4 or flac?
Two simple ways to convert audio files under PHP
You can easily convert between audio (and video) formats using free ffmpeg application. It's available for Windows, Linux and OSX. If you can't install anything on your server then you can use an online REST API instead. In this case just skip the first two parts of this article.Installing ffmpeg
You can install it under Debian 9 with:
apt-get install ffmpeg
For Debian 8 it's a bit more complicated.
First add add the following line to the bottom of /etc/apt/sources.list
deb http://ftp.uk.debian.org/debian jessie-backports main
apt-get update
apt-get install ffmpeg
Under Windows just visit:
https://ffmpeg.zeranoe.com/builds/
If you have OSX and Homebrew type:
brew install ffmpeg
Converting with ffmpeg
Usage is very simple:
ffmpeg -i input.flac -ar 44100 -ab 128k output.mp3
-i input.flac is your input file
-ab 128k is the bitrate
-ar 44100 is the sample rate
You can always just let ffmpeg use default values:
ffmpeg -i input.flac output.wav
Using REST API for conversion
If you can't install ffmpeg or don't want to use it then there is an API:
http://api.rest7.com/v1/sound_convert.php?format=mp3&url=http://yourserver.com/yourfile.wav
Instead of using a URL to your input file you can also send it via HTTP POST. Sample PHP code:
$post = array(
'file' => new CurlFile('input.flac'),
'format' => 'mp3', //specify output format, eg. mp3, wav, flac
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://api.rest7.com/v1/sound_convert.php');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
$data = curl_exec($ch);
curl_close($ch);
$json = @json_decode($data);
if ($json->success)
{
$res = file_get_contents($json->file);
file_put_contents('output.mp3', $res);
}
else
{
echo 'An error occured';
}
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