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index.md
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index.md
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---
title: "RTCTransformEvent: transformer property"
short-title: transformer
slug: Web/API/RTCTransformEvent/transformer
page-type: web-api-instance-property
browser-compat: api.RTCTransformEvent.transformer
---
{{APIRef("WebRTC")}}
The read-only **`transformer`** property of the {{domxref("RTCTransformEvent")}} interface returns the {{domxref("RTCRtpScriptTransformer")}} associated with the event.
The property exposes the WebRTC sender or receiver pipeline as a readable and writable stream of encoded media frames, which a [WebRTC Encoded Transform](/en-US/docs/Web/API/WebRTC_API/Using_Encoded_Transforms) can insert itself into in order to modify frames.
## Value
A {{domxref("RTCRtpScriptTransformer")}}.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Using WebRTC Encoded Transforms](/en-US/docs/Web/API/WebRTC_API/Using_Encoded_Transforms)