diff --git a/media/base/videoadapter.cc b/media/base/videoadapter.cc
index 553c2c320b..52619831b4 100644
--- a/media/base/videoadapter.cc
+++ b/media/base/videoadapter.cc
@@ -255,7 +255,8 @@ bool VideoAdapter::AdaptFrameResolution(int in_width,
   return true;
 }
 
-void VideoAdapter::OnOutputFormatRequest(const VideoFormat& format) {
+void VideoAdapter::OnOutputFormatRequest(
+    const rtc::Optional<VideoFormat>& format) {
   rtc::CritScope cs(&critical_section_);
   requested_format_ = format;
   next_frame_timestamp_ns_ = rtc::nullopt;
diff --git a/media/base/videoadapter.h b/media/base/videoadapter.h
index 5b3d13841b..abf6069df7 100644
--- a/media/base/videoadapter.h
+++ b/media/base/videoadapter.h
@@ -48,7 +48,7 @@ class VideoAdapter {
   // requested aspect ratio is orientation agnostic and will be adjusted to
   // maintain the input orientation, so it doesn't matter if e.g. 1280x720 or
   // 720x1280 is requested.
-  void OnOutputFormatRequest(const VideoFormat& format);
+  void OnOutputFormatRequest(const rtc::Optional<VideoFormat>& format);
 
   // Requests the output frame size from |AdaptFrameResolution| to have as close
   // as possible to |target_pixel_count| pixels (if set) but no more than