从MP4文件中提取帧 [英] Extract frames from a MP4 file

问题描述

I would like to extract frames from an MP4 file and again render a MP4 file after editing the frames.

推荐答案

我所知道的最好的代码是FFmpeg或libavcodec： http://en.wikipedia.org/wiki/Ffmpeg [ ^ ]，

http ：//ffmpeg.org/ [ ^ ]，

http://en.wikipedia.org/wiki/Libavcodec [ ^ ]，

http://libav.org/ [<一个href =http://libav.org/target =_ blanktitle =New Window> ^ ]。



在这两种情况下，您可以获得免费的开源实用程序，几乎可以制作所有内容，包括从帧图片中提取视频帧和组装视频。



现在，如何以编程方式使用它在.NET应用程序中？首先，您可以使用 System.Diagnostics.Process.Start 运行它来使用可用的实用程序：

http://msdn.microsoft.com/en-us/library/system.diagnostics.process.start.aspx [ ^ ]。



如果这还不够好，你可以自己将库包装在.NET程序集中，或找到合适的包装器。请参阅：

http://www.ffmpeg-csharp.com/ [ ^ ]，

http://sourceforge.net/projects/sharpffmpeg/ [ ^ ]，

http://vbffmpegwrapper.codeplex.com/ [ ^ ]。



毕竟，尝试找一些： http://bit.ly/VpboUJ [ ^ ]。



如果你想工作在你自己的包装但不知道如何，问一个问题，我会给你基本的想法（使用P / Invoke或C ++ / CLI混合模式项目）。



祝你好运，

-SA

The best code I know is FFmpeg or libavcodec: http://en.wikipedia.org/wiki/Ffmpeg[^],
http://ffmpeg.org/[^],
http://en.wikipedia.org/wiki/Libavcodec[^],
http://libav.org/[^].

In both cases, you can get free open-source utilities which can make nearly everything, including extracting video frames and assembling your video from frame pictures.

Now, how to use it programmatically in a .NET application? First, you can use the available utility by running it using System.Diagnostics.Process.Start:
http://msdn.microsoft.com/en-us/library/system.diagnostics.process.start.aspx[^].

If this is not good enough, you can wrap the library in a .NET assembly by yourself or find appropriate wrapper. Please see:
http://www.ffmpeg-csharp.com/[^],
http://sourceforge.net/projects/sharpffmpeg/[^],
http://vbffmpegwrapper.codeplex.com/[^].

After all, try to find some more: http://bit.ly/VpboUJ[^].

If you wish to work at such wrapper by yourself but don't know how, ask a question, I'll give you the basic ideas (using P/Invoke or C++/CLI "mixed-mode" project).

Good luck,

—SA

谢谢SA，

我正在使用vb处理加密视频mp4的项目。 net

i只想从视频流中提取i帧，你能告诉我如何确定i-frame以及如何提取它

thank you SA ,
I'm working on project to encryption video mp4 by using vb.net
i want to extract only i frame from video stream , can you told me how to determine i-frame and how to extract it

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