Zhenzhen Upscaler 视频超分

The last mile of AI video is resolution, and Zhenzhen_Upscaler_Video is the pack's answer to "my clip is 720p and I want it sharper." It's a hosted video upscaler (zhenzhen-upscaler via the T8mars/ComfyUI_Seedance reseller API): feed it a local VIDEO or a public MP4 URL, pick a target - 720p, 1080p, 2k, or 4k - and it returns an upscaled clip as a decoded ComfyUI VIDEO. Fewer knobs than anything else in the pack.

The honest context, from the KB's upscaling essay: the local community has genuinely strong free video upscalers now - SeedVR2 is ByteDance's Apache-2.0 one-step video restoration model and is the current crowd favorite, and the KB notes it beats FlashVSR on heavy upscales. So this node is a convenience play, not a capability you can't get elsewhere: if you're already paying for the pack and just need a clip finished, it's one node and no VRAM. If you upscale constantly or care about control, the local path is free and better documented. The one thing the hosted route does offer is zero local GPU cost - an upscale that might churn your card for a while happens server-side here.

How it works

Connect input_video (a local ComfyUI VIDEO, auto-uploaded) or fill in video_url with a public MP4 direct link - the tooltip is explicit that you leave video_url empty when input_video is connected. Then pick resolution and run. The node submits to the /v1/videos endpoint with the zhenzhen-upscaler model, polls, downloads, and validates the result as a real MP4 before handing it back. The pack's download machinery is genuinely defensive here - it writes to .part files, checks the MP4 header, and falls back across download paths - so an upscale that finishes on the server rarely dies on the download.

Inputs and outputs that matter

• video_url - optional public MP4 URL; leave empty if input_video is connected.
• resolution - 720p, 1080p, 2k, or 4k (default 1080p).
• input_video - optional local video to upload for upscaling.

Outputs: video, video_url, task_id, response.

Install

One node in T8mars/ComfyUI_Seedance:

# ComfyUI Manager: search "ComfyUI Seedance", or:
comfy node install seedance

Or clone https://github.com/T8mars/ComfyUI_Seedance.git into ComfyUI/custom_nodes, pip install -r requirements.txt, restart, and configure a key from api.seedance.nz/console via the Seedance API Config node or SEEDANCE_API_KEY.

Where people get burned

Two things. First, the source quality sets a floor: a badly compressed 480p clip upscaled to 4k is still a badly compressed clip, just bigger - the model can't invent detail that was never there, so match the target to what the source can support. Second, the cost: video upscaling is metered per clip and 4k is the top tier, and the download is capped by default at 8 GiB (SEEDANCE_VIDEO_MAX_MIB), so a long 4k output can legitimately run into that ceiling - shorten the clip or adjust the env var. If you're on a low-res generation from the pack's own video nodes, this node is a natural finishing step on the same bill; if your source is already decent, spend your money elsewhere and upscale locally.