Javascript 将mediaRecorder与木偶演员和铬一起使用以保存画布？

我正在尝试使用Puppeter登录到一个站点并录制画布。我已经在dev控制台中成功地使用了它，但无法在我自己的木偶脚本中使用它。我对JS/node相当陌生，我认为问题在于我使用的page.evaluate/waitis是错误的。以前我拥有（mediaRecorder=await page.evaluate…）之外的所有内容，但这不起作用，我认为这是因为它没有在页面上下文中运行

const puppeteer = require('puppeteer');
const fs = require('fs');
const config = require('./login.json');


(async () => {
    try {
        //load cookies
        const cookiesString = fs.readFileSync('./cookies.json', 'utf8');
        const cookies = JSON.parse(cookiesString);
        //open pup and browse to vm
        const browser = await puppeteer.launch({
            args:
                [
                    "--no-sandbox",
                    // "--executablePath=/usr/bin/google-chrome"
                ]
        });
        const page = await browser.newPage();
        await page.setViewport({width: 1920, height: 1080});
        await page.setCookie.apply(page, cookies);
        await page.goto(config.testurl);
        console.log(page.url());

      
        mediaRecorder = await page.evaluate((options) => {
            var recordedChunks = [];
            var options = {mimeType: "video/webm; codecs=vp9"};
            canvas = document.querySelector('canvas')
            mediaRecorder = new MediaRecorder(canvas.captureStream(25), options);
            mediaRecorder.start(10);
            // mediaRecorder.stop();
            mediaRecorder.ondataavailable = handleDataAvailable;

            // mediaRecorder.start();
            function handleDataAvailable(event) {
                console.log("data-available");
                if (event.data.size > 0) {
                    recordedChunks.push(event.data);
                    console.log(recordedChunks);
                    download();
                } else {
                    // ...
                }
            }

            function download() {
                var blob = new Blob(recordedChunks, {
                    type: "video/webm"
                });
                var url = URL.createObjectURL(blob);
                var a = document.createElement("a");
                document.body.appendChild(a);
                a.style = "display: none";
                a.href = url;
                a.download = "test.webm";
                a.click();
                window.URL.revokeObjectURL(url);
            }

            // demo: to download after 9sec
            setTimeout(event => {
                console.log("stopping");
            }, 3000);

            return mediaRecorder
        })


        mediaRecorder.ondataavailable = handleDataAvailable;

        // mediaRecorder.start();
        function handleDataAvailable(event) {
            console.log("data-available");
            if (event.data.size > 0) {
                recordedChunks.push(event.data);
                console.log(recordedChunks);
                download();
            } else {
                // ...
            }
        }

        function download() {
            var blob = new Blob(recordedChunks, {
                type: "video/webm"
            });
            var url = URL.createObjectURL(blob);
            var a = document.createElement("a");
            document.body.appendChild(a);
            a.style = "display: none";
            a.href = url;
            a.download = "test.webm";
            a.click();
            window.URL.revokeObjectURL(url);
        }

        // demo: to download after 9sec
        setTimeout(event => {
            console.log("stopping");
        }, 3000);

        await page.close();
        await browser.close();
    } catch (e) {
        console.log(e)
    }

})();