如何在nodejs中获取视频的快照？ [英] How do I get a snapshot still of a video in nodejs?
问题描述
我正在尝试编写一个nodejs服务器，它将花费一些时间输入（可能是url路径的一部分），然后在那个时间索引处提供一个视频帧的静止图像作为jpeg图片。
I am trying to write a nodejs server that will take a time input (possibly part of url path) and then provide a still of the video frame at that time index as a jpeg picture.
我可以在普通的Javascript中轻松完成这项工作，但是我无法在nodejs中看到这样做的方法。我知道我可能需要使用像canvas-canvas这样的画布插件来创建快照。
I can do this easily in plain Javascript, but I cant see a way to do this in nodejs. I know I will probably need to use a canvas plugin like node-canvas to do the snapshot.
欢迎任何想法。
以下是我目前在Javascript中的表现：
The following is how I do it in Javascript at the moment:
myjavascript.js
myjavascript.js
function capture(video, scaleFactor) {
if(scaleFactor == null){
scaleFactor = 1;
}
var w = video.videoWidth * scaleFactor;
var h = video.videoHeight * scaleFactor;
stdout("<br/> w: "+ w+ "<br/> h: "+ h);
var canvas = document.createElement('canvas');
canvas.width = w;
canvas.height = h;
var ctx = canvas.getContext('2d');
ctx.drawImage(video, 0, 0, w, h);
return canvas;
}
function shoot(){
var video = document.getElementById("videoTag");
var output = document.getElementById("output");
var canvas = capture(video, 1);
output.innerHTML = '';
output.appendChild(canvas);
}
index.html
index.html
<html>
<head>
<title>video snap</title>
<script type="text/javascript" src="myjavascript.js"></script>
</head>
<body>
<div id="video_container" >
<video id="videoTag" width="640" height="360" autobuffer="" controls="true">
<source src="frozenplanet.mp4" type="video/mp4">
<source src="frozenplanet.ogv" type="video/ogg">
</video>
</div>
<div id="output"></div>
</body>
</html>
推荐答案
node-fluent-ffmpeg 有一个不错的 takeScreenshots 函数。
var proc = new ffmpeg('/path/to/your_movie.avi')
.takeScreenshots({
count: 1,
timemarks: [ '600' ] // number of seconds
}, '/path/to/thumbnail/folder', function(err) {
console.log('screenshots were saved')
});
这篇关于如何在nodejs中获取视频的快照？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
