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# kCGDisplayStreamYCbCrMatrix

```
extern CFStringRef const kCGDisplayStreamYCbCrMatrix;
```

## Discussion

\discussion When outputting frames in 420v or 420f format, this key may be used to control which YCbCr matrix is used
The value should be one of the three kCGDisplayStreamYCbCrMatrix values specified below.

---

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