Custom libopus PHP-FFMPEG to use in Baileys

index.php

<?php

public function ConvertAudio($b64){
		
		try{
			
			if(!$this->CheckBase64($b64)){
				return false;
			}elseif(!$this->CheckSizeBase64($b64, 500, false)){
				return false;
			}
			
			$audioPath = tempnam(sys_get_temp_dir(), 'audio') . ".ogg";
			file_put_contents($audioPath, base64_decode(preg_replace('#^data:[^;]+;base64,#', '', $b64, 1)));
			
			$ffmpeg = FFMpeg::create(['timeout' => 3600]);

			$ogg = tempnam(sys_get_temp_dir(), 'audio_n') . ".ogg";
			
			$audio = $ffmpeg->openAdvanced([$audioPath]);
			
			$format = new CustomOGG();
			
			$audio->setAdditionalParameters(
				array(
				'-acodec', 'libopus',
				'-b', '19.1k',
				'-ac', '1',
				'-r', '16k',
				'-f', 'ipod'
				)
			);
			
			$audio
			->map(array('0:a'), $format, $ogg)
			->save();
			
			$mp4Data = file_get_contents($ogg);

			$mp4Base64 = base64_encode($mp4Data);
			
			unlink($audioPath);
			unlink($ogg);
			
			return $mp4Base64;
			
		}catch(\Exception $e){			
			return false;
		}
		
	}


class CustomOGG extends DefaultAudio{
    public function __construct(){
		
        $this->audioCodec = 'libopus';
		
    }

	public function getAvailableAudioCodecs(){
        return ['opus'];
    }
}