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# kVTDecompressionPropertyKey_RequestRAWOutput

For decoders that produce RAW output, this property requests that the decompression session provides unprocessed output.

```
let kVTDecompressionPropertyKey_RequestRAWOutput: CFString
```

## Discussion

When a decoder produces RAW output the [`VTDecompressionSession`](/documentation/VideoToolbox/VTDecompressionSession) automatically invokes a [`VTRAWProcessingSession`](/documentation/VideoToolbox/VTRAWProcessingSession) with default settings and emits processed frames by default, or when `kVTDecompressionPropertyKey_RequestRAWOutput` is set to `kCFBooleanFalse`.
If you want to run a [`VTRAWProcessingSession`](/documentation/VideoToolbox/VTRAWProcessingSession) on the RAW output to control the post-decode processing of the decoded `CVPixelBuffer` objects, you must set `kVTDecompressionPropertyKey_RequestRAWOutput` to `kCFBooleanTrue`. If `kVTDecompressionPropertyKey_RequestRAWOutput` is enabled and the decoder produces RAW output, the [`VTDecompressionSession`](/documentation/VideoToolbox/VTDecompressionSession) returns `CVPixelBuffer` objects in the decoder’s native RAW format, and ignores any specified image buffer attributes.

---

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