Comfy-Org/ComfyUI · error · ValueError

Duration is only supported for 5 or 10 seconds if there is n

Error message

Duration is only supported for 5 or 10 seconds if there is no end frame or reference images.

What it means

Raised by OmniProFirstLastFrameNode.execute for model 'kling-video-o1' when duration is not 5 or 10 and neither end_frame nor reference_images is supplied. The o1 endpoint only accepts fixed 5s/10s durations for plain text(+first-frame) jobs; when an end frame or references are present the duration is implied by the media instead.

Source

Thrown at comfy_api_nodes/nodes_kling.py:889

                raise ValueError("kling-video-o1 does not support audio generation.")
            if resolution == "4k":
                raise ValueError("kling-video-o1 does not support 4k resolution.")
        stories_enabled = storyboards is not None and storyboards["storyboards"] != "disabled"
        if stories_enabled and model_name == "kling-video-o1":
            raise ValueError("kling-video-o1 does not support storyboards.")
        prompt = normalize_omni_prompt_references(prompt)
        validate_string(prompt, strip_whitespace=True, min_length=0 if stories_enabled else 1, max_length=2500)
        if end_frame is not None and reference_images is not None:
            raise ValueError("The 'end_frame' input cannot be used simultaneously with 'reference_images'.")
        if end_frame is not None and stories_enabled:
            raise ValueError("The 'end_frame' input cannot be used simultaneously with storyboards.")
        if (
            model_name == "kling-video-o1"
            and duration not in (5, 10)
            and end_frame is None
            and reference_images is None
        ):
            raise ValueError(
                "Duration is only supported for 5 or 10 seconds if there is no end frame or reference images."
            )

        multi_shot = None
        multi_prompt_list = None
        if stories_enabled:
            count = int(storyboards["storyboards"].split()[0])
            multi_shot = True
            multi_prompt_list = []
            for i in range(1, count + 1):
                sb_prompt = storyboards[f"storyboard_{i}_prompt"]
                sb_duration = storyboards[f"storyboard_{i}_duration"]
                validate_string(sb_prompt, field_name=f"storyboard_{i}_prompt", min_length=1, max_length=512)
                multi_prompt_list.append(
                    MultiPromptEntry(
                        index=i,
                        prompt=sb_prompt,
                        duration=str(sb_duration),

View on GitHub (pinned to 1c6d8d45b3)

Solutions

1. Set duration to exactly 5 or 10 when using kling-video-o1 without end frame or reference images
2. Connect an end_frame or reference_images only if you actually need them; duration then no longer needs to be 5/10 in this branch
3. Switch to a non-o1 omni model if you need arbitrary durations

Example fix

// before
model_name = "kling-video-o1"
duration = 8
end_frame = None
reference_images = None

// after
model_name = "kling-video-o1"
duration = 10
end_frame = None
reference_images = None

def o1_duration_ok(model_name: str, duration: int, end_frame, reference_images) -> bool:
    if model_name != "kling-video-o1":
        return True
    if end_frame is not None or reference_images is not None:
        return True
    return duration in (5, 10)

When it happens

Trigger: model_name='kling-video-o1', duration set to any value other than 5 or 10, with end_frame=None and reference_images=None. Note duration>10 is also separately rejected (error 486's sibling check in this class).

Common situations: A shared widget feeds duration (e.g. 3, 8, or 15) from another Kling node type into the o1 path; the user assumes o1 supports the same flexible duration set as kling-video-v2.

Related errors

• Reference video {i} is too short: {dur:.1f}s. Minimum durati
• Total reference video duration is {total_video_duration:.1f}
• The 'end_frame' input cannot be used simultaneously with 're
• The 'end_frame' input cannot be used simultaneously with sto
• The maximum number of reference images allowed is 6.

AI-assisted analysis of Comfy-Org/ComfyUI@1c6d8d45b3 (2026-08-14). Data as JSON: /api/errors/28dc0998d0bd5913. Report an issue: GitHub.