在上传之前获取视频尺寸，客户端 [英] getting video dimensions before upload, client-side

问题描述

我有一个视频上传表单。用户点击浏览并选择一个文件。如何在用户选择文件的时刻获取视频尺寸（在文件甚至上传到服务器之前）。它显然必须是客户端，也许JavaScript / jQuery或Flash / Flex（喜欢js / jQuery的，但是），但他们中的任何一个可以这样做吗？

I have an upload form for an video. The user clicks browse and selects a file. How can I get the video dimensions the moment the user selects the file (before the file is even uploaded to the server). It obviously has to be something client-side with maybe javascript/jquery or flash/flex (prefer js//jquery though), but can either of them do this?

推荐答案

理论上你应该可以使用FileReader API - https ：//developer.mozilla.org/en/DOM/FileReader

In theory you should be able to use the FileReader API - https://developer.mozilla.org/en/DOM/FileReader

一旦文件被读取，您就可以解析出标题。据我所知，没有人做过这样的JavaScript。

Once the file has been read, you can parse out the headers. As far as I know, nobody has ever done this in javascript.

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