我正在尝试使用与puppeteer-recorder类似的方式从网站录制视频,但我想手动停止录制,然后保存到文件中(在我停止录制后)。我为此编写了简单的Web服务:
var express = require('express');
var app = express();
const { spawn } = require('child_process');
const puppeteer = require('puppeteer');
var record = true;
app.get('/startRecord', function (req, res)
{
const frun_record = async () => {
console.log("Start recording");
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('http://worldfoodclock.com/', { waitUntil: 'networkidle2' });
var ffmpegPath = 'ffmpeg';
var fps = 60;
var outFile = 'E:\\Code\\video-record\\output.webm';
const args = ffmpegArgs(fps);
args.push(outFile);
const ffmpeg = spawn(ffmpegPath, args);
const closed = new Promise((resolve, reject) => {
ffmpeg.on('error', reject);
ffmpeg.on('close', resolve);
});
console.log("Entering loop");
while (record) {
let screenshot = await page.screenshot({ omitBackground: true });
await write(ffmpeg.stdin, screenshot);
}
ffmpeg.stdin.end();
console.log("Recording stopped");
await closed;
};
frun_record();
res.end( "starting recording" );
})
app.get('/stopRecord', function (req, res) {
record = false;
res.end( "stopped" );
})
const ffmpegArgs = fps => [
'-y',
'-f',
'image2pipe',
'-r',
`${+fps}`,
'-i',
'-',
'-c:v',
'libvpx',
'-auto-alt-ref',
'0',
'-pix_fmt',
'yuva420p',
'-metadata:s:v:0',
'alpha_mode="1"'
];
const write = (stream, buffer) =>
new Promise((resolve, reject) => {
stream.write(buffer, error => {
if (error) reject(error);
else resolve();
});
});
var server = app.listen(8081, function () {
var host = server.address().address
var port = server.address().port
console.log("Example app listening at http://%s:%s", host, port)
})
但它总是只记录1秒钟的视频,好像流被覆盖了。我尝试将截图保存到磁盘上,这样可以得到超过1秒钟的视频。
所以主要问题是如何将所有截图放入流中,然后将其保存到磁盘上?另一件我想知道的事情是从网页上截取屏幕截图的频率是多少?