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# Ingestion

Ingestion brings media into Media Server so that it can be processed. For example, if you ingest video then Media Server must extract the video and audio from the container and decode the streams so that they can be analyzed and transcoded.

Your configuration must include exactly one ingest task. For example:

    [Ingest]
    IngestEngine=LibAvIngest

    [LibAvIngest]
    Type=libav

This example has an ingest task named `LibAvIngest`. The engine used to complete the task is specified by the `Type` parameter, in this case the `libav` ingest engine. Notice that no source file or stream is specified in the configuration. You provide the path of a file or the URL of a stream to Media Server in the `Process` action when you start processing.

Ingest engines produce one or more image tracks and possibly audio tracks:

- Each image track is named `taskName.Image_n`, where `taskName` is the name of the task and `n` is a unique number. Tracks are numbered from 1.
- Each audio track is named `taskName.Audio_lang_n`, where `taskName` is the name of the task, `lang` is the language, and `n` is a unique number. If the language is unknown, each track is named `Audio__n` (note the double underscore), where `n` is a unique number. The tracks are numbered from 1.

For example, if you ingest video from a TV broadcast, Media Server might produce an image track named `taskName.Image_1`, and three audio tracks: `taskName.Audio_French_1`, `taskName.Audio_English_2`, and `taskName.Audio_German_3`.

When you configure Media Server, the first image track produced by the ingest task can be specified by the aliases `Default_Image` and `Image_1`. The first audio track produced by an ingest engine can be specified by the alias `Default_Audio`.

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