NanmiCoder/MediaCrawler · error · Exception

Failed to save {img_type} image

Error message

Failed to save {img_type} image

What it means

Error "Failed to save {img_type} image" thrown in NanmiCoder/MediaCrawler.

Source

Thrown at tools/slider_util.py:79

                "Accept-Language": "zh-CN,zh;q=0.9,en-GB;q=0.8,en;q=0.7,ja;q=0.6",
                "AbstractCache-Control": "max-age=0",
                "Connection": "keep-alive",
                "Host": urlparse(img).hostname,
                "Upgrade-Insecure-Requests": "1",
                "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) "
                              "Chrome/91.0.4472.164 Safari/537.36",
            }
            img_res = httpx.get(img, headers=headers)
            if img_res.status_code == 200:
                img_path = f'./temp_image/{img_type}.jpg'
                image = np.asarray(bytearray(img_res.content), dtype="uint8")
                image = cv2.imdecode(image, cv2.IMREAD_COLOR)
                if resize:
                    image = cv2.resize(image, dsize=resize)
                cv2.imwrite(img_path, image)
                return img_path
            else:
                raise Exception(f"Failed to save {img_type} image")
        else:
            return img

    @staticmethod
    def clear_white(img):
        """Clear whitespace from image, mainly clearing slider whitespace"""
        img = cv2.imread(img)
        rows, cols, channel = img.shape
        min_x = 255
        min_y = 255
        max_x = 0
        max_y = 0
        for x in range(1, rows):
            for y in range(1, cols):
                t = set(img[x, y])
                if len(t) >= 2:
                    if x <= min_x:
                        min_x = x

View on GitHub (pinned to d6f7c5bb90)

Solutions

1. Check that the ./temp_image directory exists and is writable; create it before downloading slider images.
2. Verify the image URL is reachable and returns HTTP 200; retry on transient network errors.
3. Ensure the request headers (Host, User-Agent) match the image host's expectations; some CDN hosts reject mismatched headers.
4. Confirm opencv (cv2) can decode the downloaded bytes; if the response is an error page rather than an image, the decode/write will fail.

When it happens

Trigger: Thrown at tools/slider_util.py:79 when the library encounters an invalid state.

Common situations: The slider/captcha image download (httpx.get) returned a non-200 status, so the image could not be written to ./temp_image/. Causes: expired captcha image URL, anti-bot rejection of the plain httpx request despite browser-like headers, or network failure. Defensive fix: validate status and content-type before decoding with cv2.imdecode, ensure the ./temp_image directory exists, and surface the status code in the exception message.

AI-assisted analysis of NanmiCoder/MediaCrawler@d6f7c5bb90 (2026-08-15). Data as JSON: /api/errors/b4b2880451363c80. Report an issue: GitHub.