# Fields for ID3 metadata
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This table shows the fields that apply for an action to perform a one-time insertion of ID3 metadata. MediaLive inserts the metadata as base64.


| Field | Description | 
| --- | --- | 
| Action type | HLS Timed Metadata. Choose this option to insert in HLS or MediaPackage outputs.**Timed Metadata**. Choose this option to insert in CMAF Ingest outputs. | 
| Action name | A name for the metadata item. You might want to design a convention for naming ID3 metadata items, such as id3\_metadata-<UTC time>. | 
|  Start type  | Fixed or Immediate. | 
| Date and time | If the **Start type** is **Fixed**, specify the UTC start time for the ID3 metadata item. The time should be at least 15 seconds in the future.<br />Note that the time is the wall clock time, not the timecode in the input. | 
| ID3 | Enter the ID3 metadata encoded as base64. The metadata must be fully formed ID3 metadata (including both a header and a frame, as per the ID3 2.4.0 specification). <br />The content of the `value` property can include MediaLive [variable data](variable-data-identifiers.md). MediaLive will examine the contents of the base64 and perform substitutions. For example, MediaLive will change **$dt$** to the date and time. |