BerriAI/litellm · error · NotImplementedError

Video remix is not supported by Vertex AI Veo.

Error message

Video remix is not supported by Vertex AI Veo.

What it means

Raised by VertexVeoConfig.transform_video_remix_response. Even if a request somehow got through, the response transformation for remix on Vertex AI Veo is unimplemented and always raises NotImplementedError. The provider simply does not support remixing.

Source

Thrown at litellm/llms/vertex_ai/videos/transformation.py:595

        litellm_params: GenericLiteLLMParams,
        headers: dict,
        extra_body: dict[str, object] | None = None,
    ) -> tuple[str, dict]:
        """
        Video remix is not supported by Veo API.
        """
        raise NotImplementedError(
            "Video remix is not supported by Vertex AI Veo. Please use video_generation() to create new videos."
        )

    def transform_video_remix_response(
        self,
        raw_response: httpx.Response,
        logging_obj: LiteLLMLoggingObj,
        custom_llm_provider: str | None = None,
    ) -> VideoObject:
        """Video remix is not supported."""
        raise NotImplementedError("Video remix is not supported by Vertex AI Veo.")

    def transform_video_list_request(
        self,
        api_base: str,
        litellm_params: GenericLiteLLMParams,
        headers: dict,
        after: str | None = None,
        limit: int | None = None,
        order: str | None = None,
        extra_query: dict[str, object] | None = None,
    ) -> tuple[str, dict]:
        """
        Video list is not supported by Veo API.
        """
        raise NotImplementedError(
            "Video list is not supported by Vertex AI Veo. "
            "Use the operations endpoint directly if you need to list operations."
        )

View on GitHub (pinned to 77b7c6c40c)

Solutions

  1. Do not call video_remix with vertex_ai at all — see error 2261
  2. If writing a custom provider integration, route remix to a provider that implements it
Defensive patterns

Strategy: validation

Validate before calling

if provider == "vertex_ai":
    raise FeatureUnavailable("video remix response transform is not implemented for vertex_ai")

Try / catch

try:
    result = config.transform_video_remix_response(raw, logging_obj)
except NotImplementedError:
    log.warning("provider lacks remix; skipping response transform")
    raise

Prevention

When it happens

Trigger: Any code path that reaches the remix response transform for a vertex_ai/veo model — normally unreachable because the request transform (error 2261) raises first; appears if you call the transformation object directly.

Common situations: Custom handler code that only wires up response transformations; copying request-building code from another provider while reusing the vertex transformation for responses.

Understand the failure class

Background: UnsupportedOperationException and "is not supported" errors: when a library deliberately refuses a call — this error's family across 30 libraries.

Related errors

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/e609326cfdb08001. Report an issue: GitHub.