harry0703/MoneyPrinterTurbo · error · ElevenLabsMusicError

ElevenLabs music prompt exceeds 1000 characters

Error message

ElevenLabs music prompt exceeds 1000 characters

What it means

Prompt-length guard in generate_bgm: the stripped prompt exceeds MAX_PROMPT_LENGTH (1000 characters). Sent as form data alongside the video, an oversized prompt would be rejected by ElevenLabs after the whole video upload.

Source

Thrown at app/services/elevenlabs_music.py:388

    if not get_api_key():
        raise ElevenLabsMusicError("ElevenLabs API key is required")
    if not os.path.isfile(video_path):
        raise ElevenLabsMusicError("ElevenLabs input video does not exist")
    try:
        duration = float(video_duration)
    except (TypeError, ValueError) as exc:
        raise ElevenLabsMusicError(
            "ElevenLabs video duration is invalid"
        ) from exc
    if not math.isfinite(duration) or duration <= 0:
        raise ElevenLabsMusicError("ElevenLabs video duration is invalid")
    if duration > MAX_VIDEO_DURATION_SECONDS:
        raise ElevenLabsMusicError(
            "ElevenLabs supports videos up to 600 seconds"
        )
    prompt = str(prompt or "").strip()
    if len(prompt) > MAX_PROMPT_LENGTH:
        raise ElevenLabsMusicError(
            "ElevenLabs music prompt exceeds 1000 characters"
        )

    proxy_path = ""
    try:
        proxy_path = _create_video_proxy(video_path)
        return _request_bgm(proxy_path, output_path, prompt)
    except ElevenLabsMusicError:
        raise
    except OSError as exc:
        raise ElevenLabsMusicError(
            f"ElevenLabs local file operation failed: {exc}"
        ) from exc
    finally:
        _remove_file(proxy_path)

View on GitHub (pinned to 1f9f19c202)

Solutions

1. Truncate or summarize the prompt to well under 1000 chars — a music style description rarely needs more than a few sentences
2. If the prompt is LLM-generated, add a length constraint to the generation instruction
3. Validate prompt length in the UI/task layer so the user gets feedback before render time

Example fix

# before
music_prompt = full_video_script  # thousands of chars
generate_bgm(video, out, duration, music_prompt)

# after
music_prompt = full_video_script[:1000] if len(full_video_script) > 1000 else full_video_script
generate_bgm(video, out, duration, music_prompt)

from app.services.elevenlabs_music import MAX_PROMPT_LENGTH

prompt = prompt.strip()[:MAX_PROMPT_LENGTH]

When it happens

Trigger: generate_bgm called with a prompt whose .strip() length exceeds 1000 chars — typically a whole video description or concatenated per-scene prompts instead of a short style description.

Common situations: Reusing the full video script/subject text as the music prompt, LLM-generated prompts without a length budget, or prompts in CJK where token-to-char limits are easy to blow past.

Related errors

• ElevenLabs supports videos up to 600 seconds
• uploaded file must contain a decodable audio stream
• background music file is empty or missing
• background music file exceeds the 30 MB limit
• background music file is empty

AI-assisted analysis of harry0703/MoneyPrinterTurbo@1f9f19c202 (2026-08-14). Data as JSON: /api/errors/8ef655595f6f0718. Report an issue: GitHub.