Audio Upmixing

Give your content cinema-quality audio. Rad TV's audio upmixing converts stereo tracks to 5.1 or 7.1 surround sound — ideal for viewers on home theaters, gaming headsets, VR, and immersive playback devices.

Upmixing runs automatically alongside AI video upscaling when enhance: true is set.

Audio upmixing requires an active Creator+ subscription ($29.99/month). It is always bundled with AI upscaling — the same enhance: true flag triggers both.

How It Works

During transcoding with enhance: true, the audio track is analyzed
Stereo channels are spatially mapped to surround sound positions
The output includes both the original stereo and the upmixed surround audio
Playback devices automatically select the best audio track (stereo for phones, surround for home theater)

Triggering Upmixing

Audio upmixing uses the same enhance: true flag as video upscaling. There is no separate toggle — when you enhance, you get both.

With `publishVideo`

mutation {
  publishVideo(input: {
    title: "Concert Recording"
    sourceUrl: "https://example.com/concert.mp4"
    contentType: LANDSCAPE_VIDEO
    enhance: true
    publish: true
  }) {
    content { id }
    job { id status }
  }
}

With `submitContentForProcessing`

mutation {
  submitContentForProcessing(
    id: "did:rad.live:content/feature/123"
    input: {
      assetName: "concert.mp4"
      layout: LANDSCAPE
      enhance: true
    }
  ) {
    job { id status }
  }
}

Accessing Audio Output

After transcoding completes, the audio download is available via outputAssets. That field lives on the Content type, so read it off the Content a content mutation returns — the catalog Feature type does not expose it:

curl -X POST https://api.rad.live/graphql \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "query": "mutation { publishContent(id: \"did:rad.live:content/feature/123\") { id metadata { title } outputAssets { encoderType audio { download } video { hls } } } }"
  }'

const response = await fetch('https://api.rad.live/graphql', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer YOUR_API_KEY',
  },
  body: JSON.stringify({
    query: `mutation {
      publishContent(id: "did:rad.live:content/feature/123") {
        id
        metadata { title }
        outputAssets {
          encoderType
          audio { download }
          video { hls }
        }
      }
    }`,
  }),
});

const { data } = await response.json();
const content = data.publishContent;
console.log(content.outputAssets.audio.download);

import requests

response = requests.post(
    "https://api.rad.live/graphql",
    headers={
        "Content-Type": "application/json",
        "Authorization": "Bearer YOUR_API_KEY",
    },
    json={
        "query": """
        mutation {
          publishContent(id: "did:rad.live:content/feature/123") {
            id
            metadata { title }
            outputAssets {
              encoderType
              audio { download }
              video { hls }
            }
          }
        }
        """
    },
)

content = response.json()["data"]["publishContent"]
print(content["outputAssets"]["audio"]["download"])

Output Format

The OutputAudioAssets type contains:

Field	Type	Description
`download`	URL	Direct download URL for the audio file

The HLS streaming manifest (video.hls) also includes the surround audio track as an alternate stream, allowing adaptive playback clients to select stereo or surround based on device capability.

Next steps

AI Upscaling — The video enhancement that runs alongside upmixing
Output Assets — Complete guide to all generated outputs