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Encoding outputs

C-Slice uses FFmpeg for output encoding. Each selected SGCT window is encoded independently, so the total encoder load depends on frame size, output count, codec, and quality settings.

Codecs​

The UI exposes these codec choices:

  • MPEG-1, MPEG-2, MPEG-4
  • H264, H265
  • H264 NVENC, H265 NVENC
  • VP8, VP9
  • FFV1 (lossless)
  • Hap
  • ProRes
  • PNG, JPEG, TGA

Movie codecs write video containers. PNG, JPEG, and TGA write still-image sequences. FFV1 outputs to Matroska (.mkv) containers.

Frame rate and quality​

Movie codecs use the selected frame rate. The UI provides 30, 60, and custom numerator/denominator controls.

Quality controls depend on codec:

  • H.264 and H.265 software codecs use CRF.
  • H.264 NVENC and H.265 NVENC use CQ.
  • Other quality-based codecs use QScale.
  • Some codecs expose Pixel rate instead of quality.

Presets and tune​

Software H.264/H.265 exposes FFmpeg/libx preset and tune values. NVENC exposes NVIDIA preset levels and tune modes. Slower presets usually improve compression efficiency but increase encoding time.

Parameter JSON​

Optional parameter files in data/parameters can add lower-level FFmpeg options. A parameter file can contain codec options, pixel formats, and video filters:

{
  "codecParameters": {
    "options": [
      { "name": "tune", "value": "fastdecode" }
    ],
    "pixelFormats": [],
    "videoFilters": []
  }
}

Use parameter JSON files for production presets that should be reused across jobs.