请问这个包,我读取本地视频,为什么出来都是黑屏的Mat

在opencv-build的 npm install过程中，fseeko等文件not found

const cv = require('opencv4nodejs');
const vCap = new cv.VideoCapture('./summary.mp4');
const frame = vCap.read();
const matAsArray = frame.getData();
console.log(matAsArray)
获取本地视频读取，获得的矩阵，都是黑色的，为什么

auto build

*OpenCV version* (example 3.4.6)

*With OpenCV-contrib?* (extra modules): yes

*OS*: Windows 8.1

Start with the reported `npm install` failure in `opencv-build`, then inspect the `VideoCapture('./summary.mp4')` and `frame.getData()` path described in the issue. Reproduce the Windows 8.1 behavior and determine whether the missing `fseeko` files or video decoding causes the black matrix; done means the cause is documented and local video frames are read correctly.

Written by the indexing model from the issue text.