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| How to extract frames from AVI files |
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| Before you begin: |
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This example presents the AviBrowser class. This class can open AVI file and convert its frames into bitmap files. The AviBrowser object is shown used as a control on FoxPro form. For that reason, it is subclassed from the Image control.
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User rating: 0/10 (0 votes) | |
| 8513 bytes
Created: 2005-04-05 08:11:41
Modified: 2011-12-10 09:20:22
Visits in 7 days: 124 |
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| My comment: |
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The AVIStreamGetFrame returns the address of a decompressed video frame. It points to a globally allocated memory block. The block contains already populated BITMAPINFOHEADER structure followed by optional color table and the binary data.
Practically, this is a bitmap file. All you have to do is to populate the BITMAPFILEHEADER structure and add it on top of the block. Then save the result to a file with "DIB" or "BMP" extension.
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There is an issue not answered yet: the AVIStreamGetFrameOpen returns an error for some AVI files. Otherwise these are normal AVI files. I`m looking what can be done...
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Read Saving a Control Image to a Bitmap File article written by Geoff Schwab. It explains the bitmap structure in clear and simple words. |
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How to extract frames from AVI files
