AI video audio you cannot switch off: Omni 1.1, H3 and H3 Max on Sume

Three Sume video rows always make sound: Gemini Omni Flash 1.1 (which sume/auto uses), MiniMax H3 and MiniMax H3 Max. Omni 1.1 returns a 400 if you send generate_audio: false, and the two MiniMax rows have no toggle at all. If your Short or ad needs your own music or voice, remove the model's track after generation with Sume's video trim, using audio: "drop".

Which rows allow it

From the Video Router doc:

The fix: drop it after

Video trim has an audio field with keep (the default) and drop. A trim over the full length with drop returns a silent MP4. Then lay your voice track and music in Timeline, where the sound comes from an audio spine you supply plus an optional soundtrack bed. The trim limits are a source of up to 1800 seconds and an output of 0.2 to 900 seconds.

{
  "video_url": "https://media.sume.com/artifacts/artf_demo/clip.mp4",
  "start": 0,
  "duration": 8,
  "precision": "exact",
  "audio": "drop"
}

When to keep the sound

Dropping the track is not always right. A clip with synced effects, such as a pour or a footstep, can be more convincing with its own audio than with a music bed laid over silence. For a talking scene with generated speech, the sync is the whole point.

Decide per clip. For a product montage with a voiceover, drop the audio and build the sound in Timeline from your own spine. For a single hero shot that you publish as is, keep it. The two choices cost different amounts of work, and only the first adds a job.

Keep one more consideration in view. If you publish generated sound, read the disclosure and labelling rules of the platform you publish on, because audio can be part of what a label covers. That is not a technical limit, and the pages cited in this post do not address it.

Why bother

Platform pages list technical limits, not sound rules, so this is not about a spec. It is about control. A generated soundtrack may not match your brand or your voiceover, and music rights are your call, not the model's. The disclosure checklist is the better place to check what each platform wants labelled.

The cost is one more job, and exact trim re-encodes the picture. If that matters, mute in your editor instead.