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VideoAna Description

Extract each frame of the video into a bitmap

I recently came upon the task of processing video clips and extracting some features for further analysis. The basic idea was straightforward: just extract each frame of the video into a bitmap and then do whatever I wish to. I did not want to be stuck in the hardness of video decoding. I just wanted to use an existing and easy-to-use framework to extract the frames. That's when DirectShow, the widely used framework, came under consideration.

I searched the web for some solutions and I did find some. Unfortunately, what I found were mostly focused on just grabbing a single frame. This was far from efficient for my task. The typical extraction speed for such methods are around 5 to 8 frames per sec on my machine, which will be further discussed about later in this article. Keep in mind that the typical playback rate of a video is 25 frames per second! Thus, I had to dig into the DirectShow framework and write something myself. Fortunately, I ultimately achieved a speed above 300 frames per second on the DirectShow sample video ruby.avi, which is a bit small in frame sample image size and not deeply compressed :-).

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