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In DirectShow, a USB camera is represented as a "source filter." Most modern cameras provide at least two output "pins":

This is your workhorse. it provides a continuous stream of video frames, typically used for live previews. 53455028.jpg

This pin is dedicated to "snapshots." It is often used to trigger a high-resolution frame that differs from the preview resolution. Rule #1: The Capture Pin Must Be Active In DirectShow, a USB camera is represented as

Note that MJPG is a video compression format and is not identical to a standard .jpg file. Even if your camera outputs MJPG, you still need to process it if you want a standalone image file. How to Save Your Captures Rule #1: The Capture Pin Must Be Active

Below is a detailed blog post based on the concepts covered by that topic.

To do this effectively, you need to understand the relationship between the and the Still Pin . The Anatomy of a USB Camera Filter