Writing Your Own AVI Files

The reason why I deal with AVI-Files is the following: I have a program that does any (long) calculation, and the output is immediately displayed (a function graph). After each step I can save the current window content as bitmap, and after the calculation I added all the bitmaps to an AVI (using VFD.EXE). But the bitmaps take a lot of room, (up to some G-Bytes). Therefore I wanted to create a AVI-File, and add the frames immediately when they are displayed.

The vfw.h reads like a binary file, and so I have tried to press the sample WriteAVI into a C++-class. I don't want to documentate the source code in detail, just add WriteAVI.cpp and WriteAVI.h to your project and use the class.

Some problems there are still with that class:

  1. The user will be prompted to select a compression method, it should be choosen automatically or by parameter.
  2. I create DIB's (not compressed) for adding to an AVI-stream. The resulting AVI-File is not compressed even when I choose a compression method.
  3. The time for a frame is fix.

If anybody knows how to fix the problems please send me a mail, so that everybody can benefit from it.


Then these few lines will create your own AVI-file:

CAVIFile avi("test.avi");
for (int i=0; i<=20; i++)
{
CBitmap bmp;
... // fill with data
avi.AddFrame(bmp);
}
if (avi.IsOK())
AfxMessageBox("AVI created");
else
AfxMessageBox("Error");

You see writing AVI-Files is easy (now).

Download source - 4KB



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