diff --git a/sdk/objc/base/RTCVideoEncoderFactory.h b/sdk/objc/base/RTCVideoEncoderFactory.h
index b115b2ad39..a73cd77990 100644
--- a/sdk/objc/base/RTCVideoEncoderFactory.h
+++ b/sdk/objc/base/RTCVideoEncoderFactory.h
@@ -27,6 +27,9 @@ RTC_OBJC_EXPORT
 - (nullable RTC_OBJC_TYPE(RTCVideoCodecInfo) *)encoderForBitrate:(NSInteger)bitrate;
 - (nullable RTC_OBJC_TYPE(RTCVideoCodecInfo) *)encoderForBrokenEncoder;
 
+@optional
+- (nullable RTC_OBJC_TYPE(RTCVideoCodecInfo) *)encoderForResolutionChangeBySize:(CGSize)size;
+
 @end
 
 /** RTCVideoEncoderFactory is an Objective-C version of webrtc::VideoEncoderFactory.
diff --git a/sdk/objc/native/src/objc_video_encoder_factory.mm b/sdk/objc/native/src/objc_video_encoder_factory.mm
index f04aa89917..d4ea79cc88 100644
--- a/sdk/objc/native/src/objc_video_encoder_factory.mm
+++ b/sdk/objc/native/src/objc_video_encoder_factory.mm
@@ -134,6 +134,17 @@ class ObjcVideoEncoderSelector : public VideoEncoderFactory::EncoderSelectorInte
     return absl::nullopt;
   }
 
+  absl::optional<SdpVideoFormat> OnResolutionChange(const RenderResolution &resolution) override {
+    if ([selector_ respondsToSelector:@selector(encoderForResolutionChangeBySize:)]) {
+      RTC_OBJC_TYPE(RTCVideoCodecInfo) *info = [selector_
+          encoderForResolutionChangeBySize:CGSizeMake(resolution.Width(), resolution.Height())];
+      if (info) {
+        return [info nativeSdpVideoFormat];
+      }
+    }
+    return absl::nullopt;
+  }
+
  private:
   id<RTC_OBJC_TYPE(RTCVideoEncoderSelector)> selector_;
 };