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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;

}

?>

希望本文所述对大家PHP程序设计有所帮助。