php-ffmpeg的使用

[composer下载地址](https://packagist.org/packages/php-ffmpeg/php-ffmpeg "composer下载地址")

composer require php-ffmpeg/php-ffmpeg

使用方法

#### 1、视频截取图片
    
    //截取图片
        $video->frame(FFMpeg\Coordinate\TimeCode::fromSeconds(3))
           ->save($rootPath . "public/uploads/" . $fileName);//保存3张图
        $ffprobe = FFMpeg\FFProbe::create($configuration);//保存
        $duration = $ffprobe->format($video_filePath)->get('duration');
        $time = s_to_hs($duration);//获取视频的时长
#### 2、视频加水印

$watermarkPath = '/mnt/hgfs/www/test/water.png';$absolute = ['x' => 50,'y' => 100];$relative = [
       'position' => 'relative',   'bottom' => 50,   'right' => 50];//传入参数 以及水印地址
    $video->filters()->watermark($watermarkPath, $absolute);
    $video->save(new FFMpeg\Format\Video\X264('libfdk_aac'), '/mnt/hgfs/www/test/1080_new.mp4');
#### 3、生成音频波形(若要提前视频中的音波,必须转为音频)
   
    $audio = $ffmpeg->open($a1);
    $waveform = $audio->waveform(640, 120, array('#00FF00'));
    $waveform->save('wtest.png');//必须保存为 png 格式
#### 4、视频转音频
    
    // Open your video file
    $video = $ffmpeg->open( 'music.mp4' );
     
    // Set an audio format
    $audio_format = new FFMpeg\Format\Audio\Mp3();
     
    // Extract the audio into a new file as mp3
    $video->save($audio_format, 'music.mp3');
    // Set the audio file
    $audio = $ffmpeg->open( 'music.mp3' );
     
    // Create the waveform
    $waveform = $audio->waveform();
    $waveform->save( 'test2.png' );
#### 5、裁剪视频

$video = $ffmpeg->open($v1080);
    $video->filters()->crop(new FFMpeg\Coordinate\Point("t*100", 0, true), new FFMpeg\Coordinate\Dimension(960, 540));
    $video->save(new FFMpeg\Format\Video\X264('libfdk_aac'), '/mnt/hgfs/www/test/1080_new.mp4');
#### 6、音频转换
    
    $audio = $ffmpeg->open($a1);
    $format = new FFMpeg\Format\Audio\Flac();
    $format->on('progress', function ($audio, $format, $percentage) {
        echo "$percentage % 进度";
    });
    $format->setAudioChannels(2)->setAudioKiloBitrate(256);
    $audio->save($format, 'a1.flac');

#### 7、从视频中提取动图
    
    $video = $ffmpeg->open($v1080);
    $video->gif(FFMpeg\Coordinate\TimeCode::fromSeconds(10), new FFMpeg\Coordinate\Dimension(400, 200), 3)->save('1080.gif
#### 8、使用 FFProbe 提取元数据

$ffprobe = FFMpeg\FFProbe::create($path);
                //视频
        $videoInfo = $ffprobe->format($v1080);
                //音频
        $audioInfo = $ffprobe->format($a1);
                //也可以使用 get 获取特定值，第二个参数为默认值（若该参数不存在将返回此默认值）
        $duration = $ffprobe->format($v1080)->get('duration',100);
        echo "";
        print_r($videoInfo);
        print_r($audioInfo);echo "";
        echo '视频时长：'.$duration;