{
  "format_version": 1,
  "model_id": "htdemucs",
  "demucs_version": "4.0.1",
  "checkpoint_url": "https://dl.fbaipublicfiles.com/demucs/hybrid_transformer/955717e8-8726e21a.th",
  "coreml_package": "htdemucs_separator_core.mlpackage",
  "sample_rate": 44100,
  "channels": 2,
  "n_fft": 4096,
  "hop_length": 1024,
  "segment_samples": 343980,
  "segment_seconds": 7.8,
  "segment_frames": 336,
  "frequency_bins": 2048,
  "sources": [
    "drums",
    "bass",
    "other",
    "vocals"
  ],
  "vocals_source_index": 3,
  "inputs": {
    "mix": [
      1,
      2,
      343980
    ],
    "spectrogram": [
      1,
      4,
      2048,
      336
    ]
  },
  "outputs": {
    "spectrogram_stems": [
      1,
      4,
      4,
      2048,
      336
    ],
    "waveform_stems": [
      1,
      4,
      2,
      343980
    ]
  },
  "preprocessing": [
    "Decode to mono or stereo PCM.",
    "Resample to 44100 Hz.",
    "Duplicate mono to stereo.",
    "Pad each chunk to segment_samples.",
    "Reflect-pad by 1536 samples before STFT, then run normalized Hann STFT with n_fft=4096 and hop_length=1024.",
    "Drop the final frequency bin and keep centered segment_frames frames."
  ],
  "postprocessing": [
    "Take vocals_source_index from both Core ML outputs.",
    "Convert spectrogram real/imag channels back to complex STFT.",
    "Append the dropped zero frequency bin, pad two frames on both sides, and run normalized Hann ISTFT.",
    "Remove the 1536-sample STFT pad, add waveform_stems[vocals_source_index], trim original chunk length, and overlap-add chunks.",
    "Downmix the resulting stereo vocals to mono for voice cloning."
  ],
  "files": [
    {
      "path": "htdemucs_separator_core.mlpackage/Data/com.apple.CoreML/model.mlmodel",
      "bytes": 607390,
      "sha256": "c8ecef9342b67f9b6b92f5db5a4fd8600fcabfed3676cb8df773115f8d8ad693"
    },
    {
      "path": "htdemucs_separator_core.mlpackage/Data/com.apple.CoreML/weights/weight.bin",
      "bytes": 104599040,
      "sha256": "2575fe7ab6e476b1fb7171d2f103b3b4958ff61aef579ec264430c74816919ff"
    },
    {
      "path": "htdemucs_separator_core.mlpackage/Manifest.json",
      "bytes": 617,
      "sha256": "f58d575dce3a6c2e53e360987f741efc99567374e2a9962214e06151106037c0"
    }
  ]
}