interactions.create: how do you set video fps? video_metadata is rejected / ignored on 2.11.0

[tash-f]

env: google-genai==2.11.0 (current PyPI latest), Gemini Developer API (API key).

I'm trying to set a custom video frame rate on client.interactions.create, the way the cookbook shows https://github.com/google-gemini/cookbook/blob/main/quickstarts/Grounding.ipynb → "Custom frame rate":

client.interactions.create(model=MODEL, input=[...], video_metadata=types.VideoMetadata(fps=2))
On 2.11.0 that raises client-side — video_metadata isn't a field on CreateModelInteraction:
TypeError: create() got unexpected keyword argument(s): video_metadata. Use extra_body=... to send additional request body fields.

Routing it through extra_body is rejected by the API in either casing:

extra_body={'video_metadata': {'fps': 2}}   # 400 Unknown parameter 'video_metadata'
extra_body={'videoMetadata': {'fps': 2}}    # 400 Unknown parameter 'videoMetadata'

Putting fps on the video input block ({"type":"video","uri":..., "fps":2}) or in generation_config is accepted but has no effect — usage.total_input_tokens is identical with and without it, even at fps=8. It also can't be set at file-registration time (File.video_metadata comes back as read-only {'videoDuration': ...}).

Question: is there a supported way to set per-call video fps on interactions.create in 2.11.0? Is the cookbook's video_metadata= form targeting an unreleased SDK/API version? (generate_content still supports Part.video_metadata.fps.)

[strangeleo02]

The video_metadata argument is not supported by client.interactions.create in google-genai==2.11.0. The cookbook appears to be ahead of the currently available production SDK/API schema for the Interactions endpoint.