java 如何从各种视频文件格式中提取元数据？
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How can I extract meta data from various video file formats?
提问by jens
How can I extract meta data from various video file formats, especially the Resolution and the type of codec used. (But also all other stuff like author). I was not able to find a library for that.
如何从各种视频文件格式中提取元数据，尤其是分辨率和使用的编解码器类型。（但还有像作者这样的所有其他东西）。我无法为此找到图书馆。
回答by vikiiii
I have found MediaInfo, which supplies dozens of technical and tag information about a video or audio file.
我找到了MediaInfo，它提供了许多关于视频或音频文件的技术和标签信息。
There is a JNI wrapper for MediaInfo in subs4me's source treethat I find very useful.
在subs4me 的源代码树中有一个 MediaInfo 的 JNI 包装器，我发现它非常有用。
Here are some code snippets that show how to extract some information from a media file:
以下是一些代码片段，展示了如何从媒体文件中提取一些信息：
File file = new File("path/to/my/file");
MediaInfo info = new MediaInfo();
info.open(file);
String format = info.get(MediaInfo.StreamKind.Video, i, "Format",
MediaInfo.InfoKind.Text,
MediaInfo.InfoKind.Name);
int bitRate = info.get(MediaInfo.StreamKind.Video, i, "BitRate",
MediaInfo.InfoKind.Text,
MediaInfo.InfoKind.Name);
float frameRate = info.get(MediaInfo.StreamKind.Video, i, "FrameRate",
MediaInfo.InfoKind.Text,
MediaInfo.InfoKind.Name);
short width = info.get(MediaInfo.StreamKind.Video, i, "Width",
MediaInfo.InfoKind.Text,
MediaInfo.InfoKind.Name);
int audioBitrate = info.get(MediaInfo.StreamKind.Audio, i, "BitRate",
MediaInfo.InfoKind.Text,
MediaInfo.InfoKind.Name);
int audioChannels = info.get(MediaInfo.StreamKind.Audio, i, "Channels",
MediaInfo.InfoKind.Text,
MediaInfo.InfoKind.Name);
回答by Cédrick Lunven
The vikiiiisolutions works, but I found :
该vikiiii解决方案的作品，但我发现：
- It still required a bit of work to get everything running on my desktop. (download the dll, extract the code, browse files...)
- We have no clue of the constants (like "BitRate") available
- 仍然需要做一些工作才能在我的桌面上运行所有内容。（下载dll，解压代码，浏览文件...）
- 我们不知道可用的常量（如“BitRate”）
As a consequence I installed the Windows MediaInfo application and search which are the Keys available to create some java Enum and ease usage.
因此，我安装了 Windows MediaInfo 应用程序并搜索了可用于创建一些 java Enum 并简化使用的密钥。
I created a repository on github https://github.com/clun/movies-metadatato have everything in the same place. Just run mvn:teston the sample project to get informations on samples MP4, OGG, AVI, FLV, WEBM and MKV.
我在 github https://github.com/clun/movies-metadata上创建了一个存储库，将所有内容都放在同一个地方。只需运行mvn:test示例项目即可获取有关示例 MP4、OGG、AVI、FLV、WEBM 和 MKV 的信息。
Here the sample code of the test :
这里是测试的示例代码：
MovieMetadata movieMedataData = new MovieMetadata("./src/test/resources/small.mkv");
movieMedataData.get(General.FORMAT);
movieMedataData.get(Video.DURATION_STRING);
movieMedataData.get(Video.WIDTH_STRING);
movieMedataData.get(Video.HEIGHT_STRING);
movieMedataData.get(Video.BITRATE_STRING);
movieMedataData.get(Audio.COMPRESSION_RATIO);
//...
