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：
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									$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;

									}

									?>