php使用ffmpeg获取视频信息并截图的实现方法

本文实例讲述了php使用ffmpeg获取视频信息并截图的方法。分享给大家供大家参考，具体如下：

    $movie = new ffmpeg_movie('4.mp4');
    $width=$movie->getFrameWidth();
    $height=$movie->getFrameHeight();
    $count= $movie->getFrameCount();
    print $count . '';
    $n = round ( $count/16 );
    print $n . '';
    for ( $i = 1; $i <= 1; $i ++ ) {
      $img = 'screencap' . $i . '.png';
      $x = $n * $i;
      $f = $movie->getFrame($x);
      $gd_image = $f->toGDImage();
      imagepng($gd_image, $img);
      imagedestroy($gd_image);
      echo "
    \n";
    }
    $extension = "ffmpeg";
    $extension_soname = $extension . "." . PHP_SHLIB_SUFFIX;
    $extension_fullname = PHP_EXTENSION_DIR . "/" . $extension_soname;
    // load extension
    if (!extension_loaded($extension)) {
      dl($extension_soname) or die("Can't load extension $extension_fullname\n");
    }
    if (php_sapi_name() != 'cli') {
      echo '
    ';
    }
    printf("ffmpeg-php version string: %s\n", FFMPEG_PHP_VERSION_STRING);
    printf("ffmpeg-php build date string: %s\n", FFMPEG_PHP_BUILD_DATE_STRING);
    printf("libavcodec build number: %d\n", LIBAVCODEC_BUILD_NUMBER);
    printf("libavcodec version number: %d\n", LIBAVCODEC_VERSION_NUMBER);
    print_class_methods("ffmpeg_movie");
    print_class_methods("ffmpeg_frame");
    // get an array for movies from the test media directory
    $movies = getDirFiles(dirname(__FILE__) . '/tests/test_media');
    echo "--------------------\n\n";
    foreach($movies as $movie) {
      $mov = new ffmpeg_movie($movie);
      printf("file name = %s\n", $mov->getFileName());
      printf("duration = %s seconds\n", $mov->getDuration());
      printf("frame count = %s\n", $mov->getFrameCount());
      printf("frame rate = %0.3f fps\n", $mov->getFrameRate());
      printf("comment = %s\n", $mov->getComment());
      printf("title = %s\n", $mov->getTitle());
      printf("author = %s\n", $mov->getAuthor());
      printf("copyright = %s\n", $mov->getCopyright());
      printf("get bit rate = %d\n", $mov->getBitRate());
      printf("has audio = %s\n", $mov->hasAudio() == 0 ? 'No' : 'Yes');
      if ($mov->hasAudio()) {
        printf("get audio stream id= %s\n", $mov->getAudioStreamId());
        printf("get audio codec = %s\n", $mov->getAudioCodec());
        printf("get audio bit rate = %d\n", $mov->getAudioBitRate());
        printf("get audio sample rate = %d \n", $mov->getAudioSampleRate());
        printf("get audio channels = %s\n", $mov->getAudioChannels());
      }
      printf("has video = %s\n", $mov->hasVideo() == 0 ? 'No' : 'Yes');
      if ($mov->hasVideo()) {
        printf("frame height = %d pixels\n", $mov->getFrameHeight());
        printf("frame width = %d pixels\n", $mov->getFrameWidth());
        printf("get video stream id= %s\n", $mov->getVideoStreamId());
        printf("get video codec = %s\n", $mov->getVideoCodec());
        printf("get video bit rate = %d\n", $mov->getVideoBitRate());
        printf("get pixel format = %s\n", $mov->getPixelFormat());
        printf("get pixel aspect ratio = %s\n", $mov->getPixelAspectRatio());
        $frame = $mov->getFrame(10);
        printf("get frame = %s\n", is_object($frame) ? 'true' : 'false');
        printf(" get frame number = %d\n", $mov->getFrameNumber());
        printf(" get frame width = %d\n", $frame->getWidth());
        printf(" get frame height = %d\n", $frame->getHeight());
      }
      echo "\n--------------------\n\n";
    }
    if (php_sapi_name() != 'cli') {
      echo '';
    }
    /* FUNCTIONS */
    function print_class_methods($class) {
      echo "\nMethods available in class '$class':\n";
      $methods = get_class_methods($class);
      if (is_array($methods)) {
        foreach($methods as $method) {
          echo $method . "\n";
        }
      } else {
        echo "No Methods Defined\n";
      }
    }
    function getDirFiles($dirPath)
    {
      if ($handle = opendir($dirPath))
      {
        while (false !== ($file = readdir($handle))) {
          $fullpath = $dirPath . '/' . $file;
          if (!is_dir($fullpath) && $file != "CVS" && $file != "." && $file != "..")
            $filesArr[] = trim($fullpath);
        }
        closedir($handle);
      }
      return $filesArr;
    }
    ?>

运行效果如下图所示：

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