ConvertOnline

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1. Convert Online
2. Audio Converters
3. OPUS to M4A

{
  "convert": "opus-m4a",
  "multiple": true,
  "from": "opus",
  "to": "m4a",
  "note": "This conversion re-encodes from Opus (typically used in web and chat apps) to M4A (AAC in MP4 container), which is widely supported by Apple devices. Some quality loss may occur due to double lossy compression.",
  "controls": [
    {
      "type": "dropdown",
      "name": "bitrate",
      "label": "Audio Bitrate",
      "options": [
        {
          "label": "64 kbps",
          "value": "64k"
        },
        {
          "label": "96 kbps",
          "value": "96k"
        },
        {
          "label": "128 kbps (Standard)",
          "value": "128k"
        },
        {
          "label": "192 kbps",
          "value": "192k"
        },
        {
          "label": "256 kbps",
          "value": "256k"
        },
        {
          "label": "320 kbps (High)",
          "value": "320k"
        }
      ],
      "defaultValue": "128k",
      "desc": "Sets the output bitrate for the M4A file. Higher bitrates improve audio quality but increase file size. 128 kbps is standard for general use."
    },
    {
      "type": "dropdown",
      "name": "channels",
      "label": "Audio Channels",
      "options": [
        {
          "label": "Mono (1 channel)",
          "value": 1
        },
        {
          "label": "Stereo (2 channels)",
          "value": 2
        }
      ],
      "defaultValue": 2,
      "desc": "Sets the number of audio channels. Stereo is preferred for music and higher fidelity; mono is smaller and suited for voice."
    },
    {
      "type": "dropdown",
      "name": "sample_rate",
      "label": "Sample Rate (Hz)",
      "options": [
        {
          "label": "22050 Hz",
          "value": 22050
        },
        {
          "label": "44100 Hz (CD Quality)",
          "value": 44100
        },
        {
          "label": "48000 Hz",
          "value": 48000
        }
      ],
      "defaultValue": 44100,
      "desc": "Determines how many samples per second are used in the audio. 44100 Hz is the most common standard for AAC encoding."
    }
  ],
  "type": "audio"
}