ConvertOnline

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1. Convert Online
2. Audio Converters
3. M4R to AMR

{
  "convert": "m4r-amr",
  "multiple": true,
  "from": "m4r",
  "to": "amr",
  "controls": [
    {
      "type": "dropdown",
      "name": "sample_rate",
      "label": "Sample Rate (Hz)",
      "options": [
        {
          "label": "8000 Hz (Required)",
          "value": 8000
        }
      ],
      "defaultValue": 8000,
      "desc": "AMR format supports only 8000 Hz sample rate for narrowband voice encoding. This is mandatory and cannot be changed."
    },
    {
      "type": "dropdown",
      "name": "channels",
      "label": "Audio Channels",
      "options": [
        {
          "label": "Mono (1 channel only)",
          "value": 1
        }
      ],
      "defaultValue": 1,
      "desc": "AMR format only supports mono (1 channel). Stereo is not allowed. This setting is required."
    }
  ],
  "note": "AMR is a narrowband speech format primarily used in mobile phones and voice communications. It only supports mono audio and a fixed 8000 Hz sample rate. Bitrate is internally managed by the codec and cannot be set directly via FFmpeg. Converting music or stereo audio to AMR will cause significant quality loss and should only be used for voice clips or compatibility purposes.",
  "type": "audio",
  "operation": "convert"
}