KLingAI Video Downloader

Every video node in this pack eventually hands you a URL from Query Status. KLingAI Video Downloader is the terminal node that grabs that URL and drops an MP4 into ComfyUI's output directory with a clean sequence filename. It's the final step of the standard pipeline - Task → Query Status → here - and honestly the most unglamorous node in the pack. It just does the thing.

The mechanism is a straightforward streaming download: requests.get(url, stream=True) written to disk in chunks, no waiting, no task tracking. MP4 is the one format it knows (KLingAI_0001.mp4, auto-incrementing), and it writes a small JSON into the output folder's .previews directory so the result shows up in ComfyUI's history instead of vanishing into the void.

Inputs

• video_url (required) - the url output from Query Status (or any MP4 URL you want saved).
• filename_prefix (required) - default KLingAI, the base of the output filename.
• custom_output_dir (optional) - a custom save location. Note the difference from its image sibling: this one uses the value as-is (a relative path resolves relative to your working directory), so it's more permissive - and easier to point somewhere unexpected by accident.

Outputs

• video_path (STRING) - the full path where the file landed, ready to hand to other tools or script.
• video_url (STRING) - the source URL, echoed back.

That's it. Two strings, no video tensor (ComfyUI's core nodes don't have a standard video tensor type the way they do images, so the pack settles for a path you can feed to a Load Video or Video Combine node elsewhere).

Where people get burned

• Kling URLs expire. These result links are often time-limited, and a 403/410 on a "worked before" URL is the classic symptom. Re-run Query Status with the same task_id to mint a fresh URL, then download promptly.
• Blank URL. Empty input returns the error message as video_path rather than raising - check the console for the real cause.
• Wrong extension assumptions. If Kling hands back something that isn't MP4, the _0001.mp4 naming still applies and you can end up with a mislabeled file. The README's own scope says MP4; most Kling results are.
• Custom dir surprises. Because custom_output_dir is used as-is, a typo can create a folder in an odd place. The image downloader constrains you to the output tree; this one trusts you. Verify where the file landed the first time.
• Expecting more than a file. It returns a path, not something you can preview directly. That's by design for this pack - pair it with a video loader node if you need frames back in the graph.