php使用ffmpeg获取视频信息并截图的实现方法

$movie = new ffmpeg_movie('4.mp4');$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 . "/" . $extension_soname;// load extensionif (!extension_loaded($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;}?>