Convert php amr format to mp3

In audio file processing, sometimes we need to convert audio files in AMR format into MP3 format. This article will introduce how to use PHP language to complete the conversion of AMR format to MP3.

1. Introduction to AMR format

The full name of AMR is Adaptive Multi-Rate, which is a compressed audio format. Because AMR format files are small in size and have fast network transmission speeds, they are widely used in mobile phone ringtones, voice messages, mobile communications and other fields.

2. Introduction to MP3 format

The full name of MP3 is MPEG Audio Layer-3, which is a commonly used audio format. Because the MP3 format has the characteristics of high sound quality, compressibility, and small size, it is widely used in music players, movie players and other fields.

3. Conversion Ideas

Since the encoding methods of AMR format and MP3 format are different, AMR format files need to be converted into MP3 format files. The specific conversion ideas are as follows:

1. Call the system command through the exec function in PHP to execute the audio conversion software FFmpeg;
2. Execute the FFmpeg command to convert the AMR format file into an MP3 format file ;
3. After the conversion is successful, the generated MP3 format file will be saved on the server.

4. Write code

Before you start writing code, you need to install FFmpeg audio conversion software on the server. The installation method is as follows:

1. Windows system: You can go to the FFmpeg official website (https://ffmpeg.org/download.html#build-windows) to download the Windows version of FFmpeg software installation package;

2. Linux system: You can install FFmpeg software through the command line:

   sudo apt-get update
   sudo apt-get install ffmpeg

The code is as follows:

function amrToMp3($amr_input, $mp3_output)
{
    $command = "ffmpeg -i $amr_input -acodec libmp3lame -ar 22050 $mp3_output";
    exec($command, $output, $result);
    return $result == 0;
}

$amr_input = "test.amr";  // AMR格式文件名
$mp3_output = "test.mp3"; // MP3格式文件名
$result = amrToMp3($amr_input, $mp3_output);
if ($result) {
    echo "转化成功！";
} else {
    echo "转化失败！";
}

Code explanation:

The above In the code, the amrToMp3 function receives two parameters, one is the AMR format file name, and the other is the converted MP3 format file name. The function uses the exec function to execute the FFmpeg command and convert the AMR format file into an MP3 format file. After the conversion is successful, the function returns true, otherwise it returns false.

Note: When executing the FFmpeg command, you need to specify the sampling rate of the output audio (such as "-ar 22050" in the code). The selection of this value depends on the specific situation.

5. Summary

This article introduces how to use PHP language to convert AMR format audio files into MP3 format audio files. By calling system commands to execute the FFmpeg software, the conversion of audio formats is achieved. This method is fast and convenient, and is suitable for scenarios where individual audio files are converted.

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