How to make a video out of images in C# .Net Framework?

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I used Windows Forms technology and made a video animation by storing colors in bytes.
Now i can use the animation as video using Bitmap.LockBits Method.
But Bitmap.LockBits Method is slow.

What is the best way to do it on .Net Framework from scratch without using 3d party libraries?

Quote:

Have a look here:
A Simple C# Wrapper for the AviFile Library[^]

I said from scratch on pure .Net Framework, i looked at all of those links from google.

I can't comment, why?

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it only uses P/Invoke, which is not third-party.

I repeat again, on pure .Net Framework.
I know what is Platform Invoke and how to use it.
I said on .Net Framework, not using other .dll files.
Of course i can use any .dll file, but why is .Net Framework made then?
I hope now my question is plain.

I just write my question as short as possible to make it easy to understand.