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Document specifying native field IDs

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Martchus 2017-01-23 00:46:29 +01:00
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README.md
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@ -179,6 +179,23 @@ Here are some Bash examples which illustrate getting and setting tag information
```
For more information checkout the [Matroska specification](https://matroska.org/technical/specs/tagging/index.html).
* *Sets* custom fields:
```
tageditor set mkv:FOO=bar1 mp4:©foo=bar2 -f file.mkv file.m4a
```
In particular, the custom field `FOO` is set to `bar1` in test.mkv and the custom field `©foo`
is set to `bar2` in test.m4a. So the prefixes tell the tag editor that the specified field
ID is a native field ID of a particular tag format rather than a generic identifier. Native
fields are only applied to the corresponding format of course.
The following prefixes are supported:
* `mp4`: iTune-style MP4/M4A ID (must be exactly 4 characters)
* `mkv`: Matroska ID
* `id3`: ID3v2 ID (must be exactly 3 or 4 characters depending on the tag version)
* `vorbis`: Vorbis comment ID
* Here is another example, demonstrating the use of arrays and the syntax to auto-increase numeric fields such as the track number:
```