之前有个需求,上传视频时需要保存一份缩略图。以前的做法都是同时上传视频和缩略图,后台参考了网络文案。在现代浏览器可以使用HTML5的API,实现JS截取缩略效果。
HTML部分:
JS实现部分:
- (function() {
- "use strict";
- $('#file').on('change', function() {
- var files = this.files,
- video = $('#video').find('video'),
- videoURL = null,
- windowURL = window.URL || window.webkitURL;;
- if (files && files[0]) {
-
- videoURL = windowURL.createObjectURL(files[0]);
-
- $('#video').html('<video src="' + videoURL + '" controls="controls"></video>');
-
- setTimeout(function() {
- createIMG();
- }, 500);
-
- }
- }).trigger('change');
-
- var createIMG = function() {
- var scale = 0.25,
- video = $('#video').find('video')[0],
- canvas = document.createElement("canvas"),
- canvasFill = canvas.getContext('2d');
- canvas.width = video.videoWidth * scale;
- canvas.height = video.videoHeight * scale;
- canvasFill.drawImage(video, 0, 0, canvas.width, canvas.height);
-
- var src = canvas.toDataURL("image/jpeg");
- $('#imgSmallView').html('<img id="imgSmallView" src="' + src + '" alt="预览图" />');
- }
-
- })()
图片可以通过PHP接收保存:
define('UPLOAD_DIR', 'images/'); $img = $_POST['img']; $img = str_replace('data:image/png;base64,', '', $img); $img = str_replace(' ', '+', $img); $data = base64_decode($img); $file = UPLOAD_DIR . uniqid() . '.jpg'; $success = file_put_contents($file, $data); print $success ? $file : '保存出错了!';
或者您有更好方式,顺便给我个提示。
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