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# kVTVideoEncoderSpecification_EnableLowLatencyRateControl

Specifies to select an encoder that supports low-latency operation and enables low-latency mode.

```
let kVTVideoEncoderSpecification_EnableLowLatencyRateControl: CFString
```

## Discussion

Low latency rate control enforces the following behaviors:

- Infinite GOP (all P frames following the beginning IDR).
- No frame reordering (B frame) or looking ahead.
- Only High profiles. The encoder sets the levels automatically.
- Temporal Layer structure.

---

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