Which Sume video rows take video_url: Omni edit, Recast or Genjutsu

Only three rows accept video_url as a source clip: gemini-omni-flash-1.1 (edit a video with a text instruction), h3-max-recast (swap the people in a video for the people in your photos) and higgsfield-genjutsu (transfer motion from the source video onto your images). Send video_url to any other row and it is rejected.

sume/auto never routes to Recast or Genjutsu, so for those two you must pin the id. These are Video Router fields (/v1/video-router/generate); they are not part of the OpenRouter-shaped /v1/videos body.

What each row does

• Omni edit: video_url plus a prompt (for example, replace the bottle with an apple). No aspect_ratio, and the source clip sets the output length; a duration you send is only the reserve estimate, default 8 seconds.
• Recast: video_url plus 1 to 4 reference_image_urls, one photo per new person. The output keeps the source motion, camera, cuts and sound. 5 to 30 seconds, no shot longer than 15 seconds.
• Genjutsu: video_url plus 1 to 8 images, 4 to 30 seconds, 480p or 720p, listed only when its provider is configured. No aspect_ratio or generate_audio.

Cost of a 10-second source

Sume billable, list times 1.25, rounded up per job, from the Video Router docs. fal's Recast list is $0.30 at 768p and $0.45 at 1080p per its page, read 2026-10-05.

Pick by task

If the people stay and one object or style changes, use Omni edit; it is the cheapest by a wide margin. If the people must change but the shot, camera and sound stay, use Recast. If you have a performance video and want your own character to move the same way, use Genjutsu.

Because the source length sets the bill, trim the source before you submit. A 30-second source on Recast at 1080p is a deliberate cost, and the person-swap post puts it per minute of finished video.

Mistakes that return 400

Do not combine video_url with image_url, end_image_url or reference_*_urls on Omni. Do not send exactly zero images to Genjutsu or Recast; see the Genjutsu 400 post for the count rules. Do not send aspect_ratio with an edit.