PROSAGA码农传奇-Xedge-元数据提取器缺少标签列表？

<div class =“post-text”itemprop =“text”>
  
    我找到了一个标签列表：
  
  
    <a href="https://developer.tizen.org/dev-guide/2.3.1/org.tizen.guides/html/native/multimedia/metadata_extractor_n.htm" rel="nofollow noreferrer">
      https://developer.tizen.org/dev-guide/2.3.1/org.tizen.guides/html/native/multimedia/metadata_extractor_n.htm
    </A>
  
  
    但是，这些常量似乎并不是实际代码中所需要的。这是有效的Java代码：
  
   <pre>
 <code>
 import com.drew.imaging.ImageMetadataReader;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;
import com.drew.metadata.file.FileTypeDirectory;
import com.drew.metadata.mp4.Mp4Directory;
import com.drew.metadata.mp4.media.Mp4SoundDirectory;
import com.drew.metadata.mp4.media.Mp4VideoDirectory;

[.....]

Metadata theMetadata = null;
try {
    InputStream stream = new URL(theVideoInfo.getLinkToVideo()).openStream();
    theMetadata = ImageMetadataReader.readMetadata(stream);
    }

} catch (java.lang.Exception exception) {
    exception.printStackTrace();
}

Mp4SoundDirectory soundDirectory
        = theMetadata.getFirstDirectoryOfType(Mp4SoundDirectory.class);
Mp4VideoDirectory videoDirectory
        = theMetadata.getFirstDirectoryOfType(Mp4VideoDirectory.class);
Mp4Directory mp4Directory
        = theMetadata.getFirstDirectoryOfType(Mp4Directory.class);
FileTypeDirectory fileTypeDirectory
        = theMetadata.getFirstDirectoryOfType(FileTypeDirectory.class);

String numberOfAudioChannels
        = soundDirectory.getString(Mp4SoundDirectory.TAG_NUMBER_OF_CHANNELS);
String duration = mp4Directory.getString(Mp4Directory.TAG_DURATION);
String frameRate = videoDirectory.getString(Mp4VideoDirectory.TAG_FRAME_RATE);
String height = videoDirectory.getString(Mp4VideoDirectory.TAG_HEIGHT);
String width = videoDirectory.getString(Mp4VideoDirectory.TAG_WIDTH);
String type = fileTypeDirectory.getString(FileTypeDirectory.TAG_DETECTED_FILE_MIME_TYPE);

</code>
 </pre>
  
    我通过直接检查调试器中的元数据提取器对象找到了常量（TAG_HEIGHT，TAG_WIDTH等）。例如，我输入：
  
   <pre>
 <code>
 Mp4VideoDirectory.WIDTH

</code>
 </pre>
  
    ...并且调试器（IntelliJ）将自动完成其中包含文本“WIDTH”的可用常量。
  
</DIV>

元数据提取器 缺少标签列表？

元数据提取器缺少标签列表？