VideoMark Video

VIDEO in, VIDEO out, everything done

VideoMark Video is the pack's convenience node: feed it a ComfyUI VIDEO, and it paints the watermark onto the frames, optionally glues a copyright card on the head and/or tail, keeps audio in sync, and hands you a VIDEO back. One node instead of three - no decode-to-IMAGE step, no re-encode step, and no frame rate to declare by hand, because it reads that off the video.

This is the node for the 2026 workflow shape where the model already emits a VIDEO. LTX-2 and MiniMax H3 land there, and Wan pipelines reach it through Create Video. If your graph currently ends … → Save Video, dropping this in the middle is a two-wire change.

The tradeoff of a convenience node is that it hides its seams, and this one has three: the card's text size follows the watermark's scale rather than having its own, the card never gets a stroke, and there's no separate head/tail text. If you want to style the card and the watermark independently, you want Overlay + Title chained instead. If you want "watermark plus a copyright card, don't make me think", this is the one.

No community signal to lean on either - a corpus search for "videomark" across two years of r/StableDiffusion, r/comfyui and r/civitai comes back empty, and most actual watermark discussion there is about removing marks, not adding them.

How it works

It pulls the video apart with get_components(): an IMAGE tensor plus frame_rate, audio, metadata and alpha. The watermark renderer is the same code the Overlay uses - one RGBA stamp sized to the frames, alpha-composited per frame, stroke and shadow baked in - and the card, if enabled, is title_seconds × fps frames of solid colour with text and logo laid out the same way, concatenated at the ends.

Then it rebuilds a VIDEO, preserving the input's bit depth and colour space and writing the frame rate back. One honest detail: if cards changed the frame count, the original alpha channel no longer matches the picture, so it's dropped rather than encoded wrong. Source with real transparency loses it. Everything is numpy + Pillow - no dependencies, no VRAM, no model.

The inputs you'll actually touch

• video - the only required input; everything else has a default.
• mode (corner, center, floating, tile) with position, then text, opacity, scale, margin. Same rules as the Overlay: scale is a percentage of frame width so it survives a resolution change, margin is in pixels, and center/tile want opacity down around 0.12–0.22.
• title_mode - off (default), head, tail, both - with title_seconds (2 is standard) and title_text. Leave title_text empty and it inherits text, which means one text_in wire feeds both the watermark and the card.
• title_bg_color for the card, plus style and the stroke/shadow controls for the watermark, and the optional logo / logo_mask / logo_file trio - use_logo is off by default, and a wired logo beats the uploaded file.

text_in behaves like the rest of the pack: connected and non-empty wins, blank falls back to the typed text. Output is a single video, straight into Save Video.

Install

# ComfyUI Manager: search "comfyui-videomark"
cd ComfyUI/custom_nodes
git clone https://github.com/kaerozhi/comfyui-videomark.git

Also available as comfy node install comfyui-videomark. No pip step: the pack declares zero dependencies and rides on the torch/numpy/Pillow ComfyUI already ships. Restart afterwards.

Where people get burned

The node isn't there at all. It only registers if your ComfyUI exposes the comfy_api.latest VIDEO types. The pack imports them at load time and skips the node entirely if they're missing, printing a [VideoMark] line about the failed VIDEO import to the console. On an older install you get Overlay and Title and no sign of the third node. Updating ComfyUI is the fix - it isn't a pack bug, and it's the one gotcha unique to this node.

A card bigger than you expected. Card text and logo sizes follow scale, the watermark's own percentage. Bump scale for a bigger card and you've made the watermark bigger too. Chained Overlay + Title avoids that, since Title has its own logo_scale and text_scale.

A watermark that isn't there. If rendering throws, the node logs one [VideoMark] line and passes the video through untouched. You get a clean clip, not an error - read the console before debugging your wiring.

Missing font glyphs. 黑体 (simhei) has no ©, so a copyright line renders as a box there. Use 微软雅黑 / 宋体 / 楷体, or point font_file at a font file.

Dark shadow on dark footage. Invisible by definition. Keep the stroke, or set shadow_color light - same advice as the rest of the pack.

Editing the panel without a restart. The panel under web/ is scanned at startup, so changing an existing JS file only needs Ctrl+Shift+R, while adding a new one needs a ComfyUI restart.