B 站封面

复制import requests
from PIL import Image
from io import BytesIO

# 下载 B 站视频封面（通过 BV 号获取封面 URL）
bvid = "BV1GJ411x7"
api_url = f"https://api.bilibili.com/x/web-interface/view?bvid={bvid}"

resp = requests.get(api_url)
resp.raise_for_status()
data = resp.json()
cover_url = data["data"]["pic"]  # 封面原图 URL

# 下载并显示尺寸
img_resp = requests.get(cover_url)
img = Image.open(BytesIO(img_resp.content))
print(f"封面尺寸: {img.width} x {img.height}")  # 输出示例: 1920 x 1080

# 裁剪为 16:9 封面（B 站视频封面标准比例）
target_ratio = 16 / 9
w, h = img.size
if w / h > target_ratio:
    new_w = int(h * target_ratio)
    offset = (w - new_w) // 2
    img_cropped = img.crop((offset, 0, offset + new_w, h))
else:
    new_h = int(w / target_ratio)
    offset = (h - new_h) // 2
    img_cropped = img.crop((0, offset, w, offset + new_h))

img_cropped.save("cover_16_9.jpg")
print("已保存为 cover_16_9.jpg")

复制package main

import (
	"encoding/json"
	"fmt"
	"image"
	_ "image/jpeg"
	"io"
	"net/http"
)

type BiliResp struct {
	Data struct {
		Pic string `json:"pic"`
	} `json:"data"`
}

func main() {
	bvid := "BV1GJ411x7"
	apiURL := fmt.Sprintf("https://api.bilibili.com/x/web-interface/view?bvid=%s", bvid)

	// 获取封面 URL
	resp, err := http.Get(apiURL)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	var biliResp BiliResp
	if err := json.NewDecoder(resp.Body).Decode(&biliResp); err != nil {
		panic(err)
	}

	// 下载封面图片
	imgResp, err := http.Get(biliResp.Data.Pic)
	if err != nil {
		panic(err)
	}
	defer imgResp.Body.Close()

	// 解码获取尺寸
	img, _, err := image.DecodeConfig(io.LimitReader(imgResp.Body, 1<<20))
	if err != nil {
		panic(err)
	}
	fmt.Printf("封面尺寸: %d x %d\n", img.Width, img.Height)
}

复制// 浏览器环境：通过 BV 号获取封面并检测尺寸
async function getCoverInfo(bvid) {
  const apiUrl = `https://api.bilibili.com/x/web-interface/view?bvid=${bvid}`;
  
  const resp = await fetch(apiUrl);
  const data = await resp.json();
  const coverUrl = data.data.pic;

  // 加载图片获取尺寸
  const img = new Image();
  img.crossOrigin = "anonymous";
  img.src = coverUrl;
  await new Promise((resolve, reject) => {
    img.onload = resolve;
    img.onerror = reject;
  });

  console.log(`封面尺寸: ${img.width} x ${img.height}`);
  // 输出示例: 1920 x 1080
  
  // 裁剪为 16:9（Canvas 方式）
  const canvas = document.createElement('canvas');
  const targetRatio = 16 / 9;
  let sw, sh, sx, sy;
  if (img.width / img.height > targetRatio) {
    sh = img.height;
    sw = sh * targetRatio;
    sx = (img.width - sw) / 2;
    sy = 0;
  } else {
    sw = img.width;
    sh = sw / targetRatio;
    sx = 0;
    sy = (img.height - sh) / 2;
  }
  canvas.width = sw;
  canvas.height = sh;
  const ctx = canvas.getContext('2d');
  ctx.drawImage(img, sx, sy, sw, sh, 0, 0, sw, sh);
  
  // 导出为 Blob 或 DataURL
  canvas.toBlob(blob => {
    console.log('裁剪后封面大小:', blob.size, 'bytes');
  }, 'image/jpeg', 0.9);
}

getCoverInfo('BV1GJ411x7');