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There could be several reasons why you are not able to extract frames using ReadVideoFrame(BitmapData) in Accord.NET. Here are some possible solutions:

1. Make sure that you have installed the latest version of Accord.NET.

2. Check that your video file is in a supported format. Accord.NET supports a variety of video formats, such as AVI, MP4, and WMV. If your video file is not in a supported format, you may need to convert it to a supported format before you can extract frames from it.

3. Ensure that you have specified the correct video file path when opening the video file.

4. Ensure that you have specified the correct video codec when opening the video file. Some video codecs may not be supported by Accord.NET.

5. Check that the video file is not corrupted. If the video file is corrupted, you may need to repair it before you can extract frames from it.

6. Make sure that you have sufficient memory and processing power to extract frames from the video file.

7. Ensure that you have specified the correct frame index when extracting frames from the video file.

8. Check that the video file has frames to extract. If the video file has no frames, you will not be able to extract any frames from it.

If none of these solutions work, please post your code and any error messages you have received, and we will do our best to help you.