to enable the Still Pin functionality.

Depending on your project requirements, you have two main paths for saving a frame:

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

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

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

Use a if you need to "grab" a specific frame from the stream.

Reference the (specifically the StillCap sample) for the most reliable C++ implementation examples. zouhuigang/zishahu: 紫砂壶拍照项目 - GitHub

The identifier refers to a technical blog post titled "DirectShow Capture Pin and Still Pin" (originally hosted on CSDN ), which discusses the intricacies of capturing images from USB cameras using DirectShow.