gregorybesson / PlaygroundCore

    * ffmpeg -y -i in-1.wav -i in-2.wav -i in-3.wav

    * -filter_complex '[0:0][1:0][2:0]concat=n=3:v=0:a=1[out]' -map '[out]' out.wav

    */

    public function concatenateSounds($sounds = array(), $target)

    {

        if (!is_array($sounds)) {

            $sounds = array($sounds);

        }

        $this->serviceLocator->setShared('playgroundcore_phpvideotoolkit', false);

        $ffmpeg = $this->serviceLocator->get('playgroundcore_phpvideotoolkit')

            ->addPreInputCommand('-y');

        $concat = '';

        foreach ($sounds as $k => $s) {

            $ffmpeg->addCommand('-i', $s, true);

            $concat .= '['.$k.':0]';

        }

        $concat .= 'concat=n='. count($sounds) .':v=0:a=1[out]';

        $ffmpeg->addCommand('-filter_complex', $concat)

            ->addCommand('-map', '[out]')

            ->setOutputPath($target)

            ->execute();

        return $target;

    }

    /**

    * This method merge an array of sounds

    * ffmpeg -i in-1.wav -i in-2.wav -i in-3.wav

    * -filter_complex "[0:a][1:a][2:a]amerge=inputs=3[aout]" -map "[aout]" -ac 2 out.wav

    */

    public function mergeSounds($sounds = array(), $target)

    {

        if (!is_array($sounds)) {

            $sounds = array($sounds);

        }

        $this->serviceLocator->setShared('playgroundcore_phpvideotoolkit', false);

        $ffmpeg = $this->serviceLocator->get('playgroundcore_phpvideotoolkit')

            ->addPreInputCommand('-y');

        $merge = '';

        foreach ($sounds as $k => $s) {

            $ffmpeg->addCommand('-i', $s, true);

            $merge .= '['.$k.':a]';

        }

        $merge .= 'amerge=inputs='. count($sounds) .'[aout]';

        $ffmpeg->addCommand('-filter_complex', $merge)

            ->addCommand('-map', '[aout]')

            ->addCommand('-ac', '2')

            ->setOutputPath($target)

            ->execute();

        return $target;

    }

    /*

    *  this method takes an image (with alpha) or a mov video (the format to keep alpha channel) and overlay this layer