Another approach is to use something like Uber Uploader (http://uber-uploader.sourceforge.net/) which is a perl / php hybrid solution with a progress bar. You would simply upload the files to your server and then have your server FTP them in the background to the final destination. It is an extra step but it gives you some time to do any processing / encoding / etc. that you may need to do before sending to S3.
I'm looking for a solution as well. Maybe this will be of some help,
From AWS Dev Commnity But in many languages (PHP, Java), for big files, you have to use streams through which the language environment will take chunks of your big file one after the other (in order to fill up central memory with huge amount of data for the http POST of S3 needed for the upload.
The nice thing about stream is that they have a callback called whenever the next chunk is read for to further PUT (in the https sense) data to S3. You can use this callback to compute and display the progress on the client UI.
See the doc of libcurl to see in details how all this works.
Update: It looks like there are two straightforward options.
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html5 javascript 可以让你做到这一点，如果你不介意缺乏浏览器支持（截至本文仅支持 Firefox 和 Chrome_）
示例如下： https://developer.mozilla.org/en/Using_files_from_web_applications
这不是具体的到 AWS，但可能会帮助您更接近。
html5 javascript can allow you to do it, if you don't mind lack of browser support (Firefox and Chrome only as of this post_
Example here: https://developer.mozilla.org/en/Using_files_from_web_applications
This isn't specific to AWS, but may help you get closer.
另一种方法是使用 Uber Uploader (http://uber-uploader.sourceforge.net/) 这是一个带有进度条的 perl / php 混合解决方案。 您只需将文件上传到您的服务器，然后让您的服务器在后台通过 FTP 将它们传输到最终目的地。 这是一个额外的步骤，但它为您提供了一些时间来执行发送到 S3 之前可能需要执行的任何处理/编码/等操作。
Another approach is to use something like Uber Uploader (http://uber-uploader.sourceforge.net/) which is a perl / php hybrid solution with a progress bar. You would simply upload the files to your server and then have your server FTP them in the background to the final destination. It is an extra step but it gives you some time to do any processing / encoding / etc. that you may need to do before sending to S3.
我也在寻找解决方案。 也许这会有所帮助，
更新：看起来有两个简单的选择。
我个人讨厌使用第 3 方扩展（Flash、Java）使应用程序功能，但我还没有找到其他方法。
I'm looking for a solution as well. Maybe this will be of some help,
Update: It looks like there are two straightforward options.
I personally hate using 3rd party extensions (Flash, Java) to make an app function, but I haven't found another way.