affaan-m/ECC · error · ValueError

Seed must be a nonnegative integer

Error message

Seed must be a nonnegative integer

What it means

render() validates the random seed used by the deterministic glitch effects. It must be a genuine int (bool is explicitly rejected) and non-negative; otherwise it raises ValueError('Seed must be a nonnegative integer').

Solutions

1. Pass a plain non-negative int, e.g. seed=42
2. Convert negative hashes with abs() or mask: seed & 0xFFFFFFFF
3. Coerce validated input: seed = int(value); assert seed >= 0
4. Reorder arguments if a bool was passed positionally into the seed slot

Example fix

// before
render(src, 0, out, seed=random.getrandbits(32) - 2**31)  # can be negative
// after
render(src, 0, out, seed=random.getrandbits(32))  # always non-negative

if isinstance(seed, bool) or not isinstance(seed, int) or seed < 0:
    raise ValueError('seed must be a nonnegative int')

def is_valid_seed(v) -> bool:
    return isinstance(v, int) and not isinstance(v, bool) and v >= 0

try:
    render(src, 0, out, seed=seed)
except ValueError as e:
    if 'Seed must be' in str(e):
        seed = abs(int(seed))
        render(src, 0, out, seed=seed)

When it happens

Trigger: Passing seed=True/False (bools are ints in Python but rejected explicitly); passing a negative int like -1; passing a float such as 1.5 or a numeric string like '42'.

Common situations: Feeding seed from a config where it was parsed as float; using a hash that can be negative (e.g. Python's hash()); accidentally passing a boolean flag as the seed parameter positionally.

Understand the failure class

Background: "Must be a positive integer", "Invalid value", "Unsupported": the invalid-argument-value error family, when a library rejects the value you pass — this error's family across 35 libraries.

Related errors

• apply_local needs at least one media clip
• asset contains too few frames
• asset requires verified alpha
• candidate fps/duration/retime ambiguity
• Crop must contain four finite values

AI-assisted analysis of affaan-m/ECC@8321021c54 (2026-09-16). Data as JSON: /api/errors/cadabe8209204592. Report an issue: GitHub.

Appendix: source

Thrown at skills/taste-application/scripts/tasteforge/media/glitch.py:120

    start,
    duration,
    output,
    seed,
    mode="drift",
    width=1920,
    height=1080,
    fps=30,
    overwrite=False,
):
    geometry(width, height, fps, duration)
    if not math.isfinite(start) or start < 0:
        raise ValueError("Start must be finite and nonnegative")
    if mode not in ("drift", "feedback", "pixelsort", "mosh"):
        raise ValueError("Unknown effect mode")
    if not Path(source).is_file():
        raise FileNotFoundError(source)
    if isinstance(seed, bool) or not isinstance(seed, int) or seed < 0:
        raise ValueError("Seed must be a nonnegative integer")
    if Path(source).resolve() == Path(output).resolve():
        raise ValueError("Output must differ from the original source media")
    with output_file(output, overwrite) as temporary:
        dec = subprocess.Popen(
            [
                "ffmpeg",
                "-nostdin",
                "-v",
                "error",
                "-ss",
                str(start),
                "-t",
                str(duration),
                "-i",
                str(source),
                "-f",
                "rawvideo",
                "-pix_fmt",

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