Audio Transcoding

Reference for audio-only transcoding and delivery.

Gumlet allows you to transcode and deliver only audio streams using APIs. Audio streams can be delivered adaptive bitrate streaming formats like HLS and DASH, also it can be delivered in MP4 format.

To enable audio-only processing you just need to enable the audio_only flag in Create Asset API, and provide an audio file in any of the following formats: mp3, opus, flac, wav, ac3, m4a, aac.

curl -L -X POST '' \
-H 'Authorization: Bearer <YOUR API KEY>' \
-H 'Content-Type: application/json' \
--data-raw '{
    "source_id": "5f462c1561cf8a766464ffc4",
    "format": "hls",
    "audio_only": true
    "asset_id": "61973239b4670bdc996729d5",
    "progress": 0,
    "created_at": 1637298745987,
    "status": "queued",
    "tag": [],
    "source_id": "5f462c1561cf8a766464ffc4",
    "input": {
        "transformations": {
            "format": "hls",
            "audio_codec": [
            "video_codec": [
            "thumbnail": [
            "thumbnail_format": "png",
            "mp4_access": false,
            "audio_only": true,
            "keep_original": true,
            "per_title_encoding": true,
            "process_low_resolution_input": false
        "source_url": "",
        "additional_tracks": []
    "output": {
        "format": "hls",
        "status_url": "",
        "playback_url": ""