裁剪直播视频流
我有一个通过 Flash 播放器从外部源显示在网页上的流视频。该视频有一个巨大的边框，我想在显示之前将其裁剪掉。如何在向用户显示之前实时更改提要，以便删除生成的视频的边框？
谢谢。
I have a streaming video that is displayed on a web page through a flash player from an external source. This video has a huge border that I would like to crop out before displaying. How can I alter the feed in real time before showing it to the user, such that the resulting video has its border removed?
Thanks.
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您不需要裁剪流，只需将遮罩应用到所需尺寸的视频对象（无边框的流大小）。在全屏模式下您可能会遇到一些困难。您也可以通过这种方式调整视频对象的大小，使其填充您正在显示流的区域。这需要一些数学知识，但应该是可以管理的。
You don't need to crop the stream, you can simply apply a mask to the video object in the desired dimension (size of stream without borders). You may have some difficulties in fullscreen mode. Also you may resize the video object in that way, that it fills the area where you are displaying the stream. This needs some math, but should be manageable.
您可以使用 FFMpeg.exe 裁剪视频。
另外，如果它很大，您可以用它调整视频大小。
You can use FFMpeg.exe to crop video.
Also if it's very big, you can resize video with it.