Lipsync

Lipsync

Drive a face's mouth from an audio track. This skill routes across the lip-sync endpoints in the RunComfy catalog — OmniHuman, Sync Labs sync v2, Kling lipsync, Creatify — picking the right model for the user's actual intent and shipping the documented prompts + the exact runcomfy run invoke.

runcomfy.com · Sync Labs models · CLI docs

Powered by the RunComfy CLI

# 1. Install (see runcomfy-cli skill for details)
npm i -g @runcomfy/cli      # or:  npx -y @runcomfy/cli --version

# 2. Sign in
runcomfy login              # or in CI: export RUNCOMFY_TOKEN=<token>

# 3. Lipsync
runcomfy run <vendor>/<model> \
  --input '{"video_url": "...", "audio_url": "..."}' \
  --output-dir ./out

CLI deep dive: `runcomfy-cli` skill.

Consent

Driving a real person's mouth from a separate audio track is dual-use. Refuse user requests that target real public figures without consent, or that aim at defamatory or sexually explicit synthetic media. The skill itself does not gate inputs — the responsibility rests with the operator.

Pick the right model

Listed newest first within each subtype. The agent picks one route based on: input shape (portrait still + audio vs source video + audio vs script-only), quality tier, and budget.

Source video + audio → lip-synced video (mouth-swap on existing footage)

Sync Labs sync v2 Pro — sync/sync/lipsync/v2/pro (default for premium)

Sync Labs' premium lip-sync — state-of-the-art mouth motion onto an existing video. Preserves the rest of the frame untouched. Pick for: hero-quality dubs, lipsync on professionally-shot video, foreign-language dubbing where mouth fidelity matters most. Avoid for: cost-sensitive batch jobs — drop to sync v2.

Sync Labs sync v2 — `sync/sync/lipsync/v2`

Standard Sync Labs tier, same workflow as Pro. Pick for: scaled / batch lipsync jobs, drafts. Avoid for: hero delivery — use v2 Pro.

Kling Lipsync (audio-to-video) — `kling/lipsync/audio-to-video`

Kling's lip-sync onto a source video, driven by an audio track. Pick for: Kling-pipeline integration; alternative to Sync Labs. Avoid for: top-tier mouth fidelity — Sync Labs Pro is the industry benchmark.

Creatify Lipsync — `creatify/lipsync`

Creatify's lipsync endpoint. Pick for: Creatify-ecosystem workflows. Avoid for: comparison shopping unless cost / latency favors it.

Portrait still + audio → talking-head video (avatar-style)

OmniHuman — bytedance/omnihuman/api (default for avatar-style)

ByteDance's audio-driven full-body avatar. One portrait + one audio → video where the subject speaks / gestures naturally. Listed under RunComfy's /feature/lip-sync as the curated default. Pick for: UGC voiceover, virtual presenter, dubbed product demo from a single portrait. Avoid for: lip-sync onto an existing video (no portrait, want to preserve original motion) — use Sync Labs v2 instead.

Wan 2-7 with `audio_url` — wan-ai/wan-2-7/text-to-video

Open-weights t2v with audio_url field — prompt describes the scene, audio drives the mouth. Pick for: full scene control (not just a portrait) with a specific voiceover MP3 + open-weights pipeline. Avoid for: simplest "portrait talks" — use OmniHuman.

Generate-and-sync from a script (no audio file available)

Kling Lipsync (text-to-video) — `kling/lipsync/text-to-video`

Generates speech audio in-pass from a script and syncs it to the resulting video. Pick for: "write a script → get a video with synced speech", no audio file needed. Avoid for: precise lip-sync to a specific MP3 (audio is regenerated each call, not locked).

HappyHorse 1.0 — happyhorse/happyhorse-1-0/text-to-video (also /image-to-video)

Arena #1 t2v / i2v with in-pass audio generated from prompt. Quote the spoken line inside the prompt with says clearly: "…". Pick for: written script, in-pass audio with strong overall quality, social/UGC clips. Avoid for: locking mouth to a pre-recorded voiceover.

Route 1: Sync Labs sync v2 / Pro — default for mouth-swap

Model: sync/sync/lipsync/v2/pro (or sync/sync/lipsync/v2) Catalog: sync v2 Pro · sync v2

Invoke

runcomfy run sync/sync/lipsync/v2/pro \
  --input '{
    "video_url": "https://your-cdn.example/source-video.mp4",
    "audio_url": "https://your-cdn.example/voiceover.mp3"
  }' \
  --output-dir ./out

Tips

• Source video provides everything except the mouth — camera, lighting, background, body pose all preserved.
• Audio quality drives mouth quality. Clean voiceover (no music bed) → cleaner sync. Isolate voice stem if needed.
• Match audio length to video length. Significant audio/video duration mismatch leads to drift; trim audio or extend video first.
• Schema details on the model page.

Route 2: OmniHuman — default for avatar from still

Model: bytedance/omnihuman/api Catalog: omnihuman

Invoke

runcomfy run bytedance/omnihuman/api \
  --input '{
    "image_url": "https://your-cdn.example/portrait.jpg",
    "audio_url": "https://your-cdn.example/voiceover.mp3"
  }' \
  --output-dir ./out

Tips

• Portrait framing works best — head-and-shoulders or upper body.
• No prompt — the model derives everything from image + audio. Don't fight that.
• See the `ai-avatar-video` skill for the full avatar treatment.

Route 3: Kling Lipsync — Kling-ecosystem mouth sync

Model: kling/lipsync/audio-to-video (existing video + audio) or kling/lipsync/text-to-video (script-only) Catalog: Kling lipsync a2v · Kling lipsync t2v

Invoke (audio-to-video variant)

runcomfy run kling/lipsync/audio-to-video \
  --input '{
    "video_url": "https://your-cdn.example/source-video.mp4",
    "audio_url": "https://your-cdn.example/voiceover.mp3"
  }' \
  --output-dir ./out

Schema details on the model page.

Common patterns

Foreign-language dub of an existing brand video

• Route 1 (Sync Labs sync v2 Pro) with the original video + translated voiceover MP3.

UGC ad creator from a portrait

• Route 2 (OmniHuman) with the creator's portrait + product-pitch voiceover.

Multi-language launch (same identity, many languages)