diff --git a/api/video/encoded_frame.cc b/api/video/encoded_frame.cc
index ec8877cb36..f9152b23f1 100644
--- a/api/video/encoded_frame.cc
+++ b/api/video/encoded_frame.cc
@@ -21,5 +21,9 @@ uint32_t EncodedFrame::Timestamp() const {
   return timestamp;
 }
 
+void EncodedFrame::SetTimestamp(uint32_t rtp_timestamp) {
+  timestamp = rtp_timestamp;
+}
+
 }  // namespace video_coding
 }  // namespace webrtc
diff --git a/api/video/encoded_frame.h b/api/video/encoded_frame.h
index 8bfa61e2cc..1b0a26a5fc 100644
--- a/api/video/encoded_frame.h
+++ b/api/video/encoded_frame.h
@@ -58,8 +58,9 @@ class EncodedFrame : public webrtc::VCMEncodedFrame {
 
   virtual bool GetBitstream(uint8_t* destination) const = 0;
 
-  // The capture timestamp of this frame.
+  // The capture timestamp of this frame, using the 90 kHz RTP clock.
   virtual uint32_t Timestamp() const;
+  virtual void SetTimestamp(uint32_t rtp_timestamp);
 
   // When this frame was received.
   virtual int64_t ReceivedTime() const = 0;