How-to Transcode an Audio-Only or Video-Only Output

Before you start

This guide assumes that you understand the basics of making a Transcode API request. We recommend completing the Getting Started with Transcoding Media guide first.

Transcode an audio-only or video-only output

Sometimes you might want to extract the audio from an input file that contains both audio and video. You might do this if you need to generate a file for transcription or if you are generating audio-only variants for How-to Transcode to HLS Streaming Format.

Or perhaps the inverse is true, where you want to output a file that contains video with no audio.

This guide shows you how to use the Media Transcode API to take an input file and output to an audio-only output or video-only output.

Default behavior

By default, the Media Transcode API will output both video and audio if they exist in an input file.

Removing video or audio

You can explicitly tell the Transcode API to "remove" either video or audio in your API call when you define an output. Here is a snippet to demonstrate creating an audio-only output file and a video-only output file:

"outputs": [
    {
        "id" : "my-audio-only-output",
        "destination" : {
            "ref" : "my-s3-storage",
            "filename" :  "audio-only.mp4"
        },
        "kind" : "mp4",
        "video": "remove"
    },
    {
        "id" : "my-video-only-output",
        "destination" : {
            "ref" : "my-s3-storage",
            "filename" :  "video-only.mp4"
        },
        "kind" : "mp4",
        "audio": "remove"
    }
]

In the above example, we are not providing any audio or video configuration settings, so we are leaving it to the API to choose the defaults based on the kind. Of course, you can always customize your parameters to specify a format, see our guide on How-to Transcode to a Specification.


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