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# kVTDecompressionPropertyKey_OnlyTheseFrames

Requests that frames be filtered by type.

```
let kVTDecompressionPropertyKey_OnlyTheseFrames: CFString
```

## Discussion

This is an optional property for video decoders to implement.  If supported, it requests that the decoder limit decoding to the frame type specified by one of the `Only These Frames Constants`. This key may be used on its own, or may appear in the dictionaries returned in the array obtained from [`kVTDecompressionPropertyKey_SuggestedQualityOfServiceTiers`](/documentation/VideoToolbox/kVTDecompressionPropertyKey_SuggestedQualityOfServiceTiers).

If [`kVTDecompressionPropertyKey_ReducedFrameDelivery`](/documentation/VideoToolbox/kVTDecompressionPropertyKey_ReducedFrameDelivery) is supported and used in conjunction with this property, the `ReducedFrameDelivery` is the proportion of the frames selected by this property. For example, a dictionary containing `[{kVTDecompressionPropertyKey_OnlyTheseFrames, kVTDecompressionProperty_OnlyTheseFrames_KeyFrames}, {kVTDecompressionPropertyKey_ReducedFrameDelivery, 0.25}]` would request that the decoder only deliver 1/4 of keyframes.

## Topics

### Frame Constants

[`kVTDecompressionProperty_OnlyTheseFrames_AllFrames`](/documentation/VideoToolbox/kVTDecompressionProperty_OnlyTheseFrames_AllFrames)

[`kVTDecompressionProperty_OnlyTheseFrames_IFrames`](/documentation/VideoToolbox/kVTDecompressionProperty_OnlyTheseFrames_IFrames)

[`kVTDecompressionProperty_OnlyTheseFrames_KeyFrames`](/documentation/VideoToolbox/kVTDecompressionProperty_OnlyTheseFrames_KeyFrames)

[`kVTDecompressionProperty_OnlyTheseFrames_NonDroppableFrames`](/documentation/VideoToolbox/kVTDecompressionProperty_OnlyTheseFrames_NonDroppableFrames)


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