Question

<script src="jquery.js"></script>
<video id="video" controls preload="none" width="640" poster="http://media.w3.org/2010/05/sintel/poster.png" onloadedmetadata="$(this).trigger('video_really_ready')">
    <source id='mp4' src="http://media.w3.org/2010/05/sintel/trailer.mp4" type='video/mp4' />
    <source id='webm' src="http://media.w3.org/2010/05/sintel/trailer.webm" type='video/webm'/>
    <source id='ogv' src="http://media.w3.org/2010/05/sintel/trailer.ogv" type='video/ogg' />
</video>
<br />

<input type="button" id="capture" value="Capture" /> Press play, and then start capturing
<div id="screen"></div>
<script>
var VideoSnapper = {

    /**
     * Capture screen as canvas
     * @param {HTMLElement} video element 
     * @param {Object} options = width of screen, height of screen, time to seek
     * @param {Function} handle function with canvas element in param
     */
    captureAsCanvas: function(video, options, handle) {

        // Create canvas and call handle function
        var callback = function() {
            // Create canvas
            var canvas = $('<canvas />').attr({
                width: options.width,
                height: options.height
            })[0];
            // Get context and draw screen on it
            canvas.getContext('2d').drawImage(video, 0, 0, options.width, options.height);
            // Seek video back if we have previous position 
            if (prevPos) {
                // Unbind seeked event - against loop
                $(video).unbind('seeked');
                // Seek video to previous position
                video.currentTime = prevPos;
            }
            // Call handle function (because of event)
            handle.call(this, canvas);    
        }

        // If we have time in options 
        if (options.time && !isNaN(parseInt(options.time))) {
            // Save previous (current) video position
            var prevPos = video.currentTime;
            // Seek to any other time
            video.currentTime = options.time;
            // Wait for seeked event
            $(video).bind('seeked', callback);              
            return;
        }

        // Otherwise callback with video context - just for compatibility with calling in the seeked event
        return callback.apply(video);
    }
};

$(function() {

    $('video').bind('video_really_ready', function() {
        var video = this;
        $('input').click(function() {
            var canvases = $('canvas');
            VideoSnapper.captureAsCanvas(video, { width: 160, height: 68, time: 40 }, function(canvas) {
                $('#screen').append(canvas);                         
                if (canvases.length == 4) 
                    canvases.eq(0).remove();     
            })
        }); 
    });

});
</script>

如何添加YouTube视频。无法在视频标记中播放YouTube视频。 embed标签正在播放youtube视频。如何通过将youtube视频放在embed标签内来截取屏幕截图。请帮帮我

Answer 1

我可以用ffmpeg来解决这个问题。

跑步

ffmpeg -i inputfile.avi  -r 1 -t 1 -ss  00:00:03 image-%d.jpeg

，其中

-i inputfile.avi - 输入文件
-r 1 - 每秒一帧
-t 1 - 应将多少秒转换为图片
-ss 00:00:03 - 从第二天开始
image-%d.jpeg - 生成的文件名模板

在此处找到http://linuxers.org/tutorial/how-extract-images-video-using-ffmpeg

Answer 2

以下书签在点击时以当前视频分辨率和质量捕获 Youtube 视频，如您所见，但没有工具栏覆盖。

javascript:void(function(){let canvas=document.createElement("canvas"),video=document.querySelector("video"),ctx=canvas.getContext("2d");canvas.width=parseInt(video.offsetWidth),canvas.height=parseInt(video.offsetHeight),ctx.drawImage(video,0,0,canvas.width,canvas.height);var base64ImageData=canvas.toDataURL("image/jpeg"),o = new Date(0),p = new Date(video.currentTime*1000),filename="?Capture_"+new URL(document.location.href).searchParams.get("v")+"_"+document.title+"@"+new Date(p.getTime()-o.getTime()).toISOString().split("T")[1].split("Z")[0]+".jpg",a=document.createElement("a");a.download=filename,a.href=base64ImageData,a.click()}());

增强了此处找到的书签https://github.com/ReeganExE/youtube-screenshot.：

用作文件下载的图像。
不会阻止正在播放的视频。
图像标题包含 Youtube ID、视频标题和视频中捕获的确切时间。
修改后也适用于 Firefox

Answer 3

如果手动设置图片，这可能会对您有所帮助。

尝试将poster="placeholder.png" //photo you want添加到视频代码中。

示例

<video width="470" height="255" poster="placeholder.png" controls> <source src="video.mp4" type="video/mp4"> <source src="video.ogg" type="video/ogg"> <source src="video.webm" type="video/webm"> <object data="video.mp4" width="470" height="255"> <embed src="video.swf" width="470" height="255"> </object> </video>

如何拍摄youtube截图

3 个答案: