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FX Chain

FX Chain · screenshot coming soon

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What this node does

FX Chain is the “render” node at the end of a video FX chain. The FX stages you wire along the video wire don’t each re-encode — they pass an fx_spec down the wire. FX Chain unpacks that chain and applies every effect in one ffmpeg transcode, then encodes to your chosen delivery settings. Press ▶ Run to render; the output is a new COMFYTV_VIDEO. The card lists the FX in the chain in order (with per-row previews where available), so you can see exactly what will be baked. FX Chain needs an upstream video and at least one FX stage in the chain; running with an empty chain or no video errors.

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When to use it

  • Finalize a stack of FX stages (color, blur, keying, etc.) into one output without intermediate re-encodes.
  • Set the final delivery resolution, frame rate, codec and quality for export.
  • Produce a single clean master from a chain you’ve been previewing live.

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Parameters

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out_colorspace

Output color space: bt709 (default), bt601-6-625, bt2020, smpte170m.

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out_size

Delivery short-side resolution: source (default, keep original), 2160, 1440, 1080, 720, 540, 480.

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out_fps

Delivery frame rate: source (default), 24, 25, 30, 50, 60.

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out_codec

Output codec: h264 (default), hevc, prores.

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out_quality

Encode quality: draft, standard (default), high.

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Inputs and outputs

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Tips

  • Keep FX Chain last on the video wire — everything upstream is a spec, and this node is where it actually renders.
  • One pass means better quality and speed than re-encoding at each FX stage; the trade-off is you don’t get an intermediate file between effects.
  • Use source size/fps to preserve the original; only downscale or change frame rate here for the final deliverable.
  • prores is for editorial/mezzanine delivery; h264/hevc for distribution.

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Types and bridges

COMFYTV_VIDEO is a ComfyTV project snapshot, not a native ComfyUI VIDEO. Use a Bridge (ComfyTV/Bridge) to interoperate with native nodes. See bridges.md.
  • Any ComfyTV VideoFX stage — these build the chain that FX Chain bakes.
  • Expression — drive an FX parameter with a per-frame expression.