Here's a good insights regarding the cases where you need image flipping when coding filter in Directshow. There's quite lengthy narration on the history and the details on the article, but here's some important point :
- Some Color Format use top-down orientation (the start of the image is on upper-left corner, e.g: RGB) other use bottom-up (start from lower-right corner, e.g: YUV)
- The given height value show whether the image follow the orientation. Positive means the data follow the orientation, negative means it is inverted
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