--- a/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.cpp
+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.cpp
@@ -298,7 +298,13 @@
 void GStreamerVideoCaptureSource::generatePresets()
 {
     Vector<VideoPreset> presets;
+    // A V4L2 device may list several sizes in one structure, for instance
+    // width=640, height={ 480, 360 }. Split them into one structure each,
+    // or every size listed that way is skipped below as not discrete - on
+    // a typical laptop camera that is every 4:3 mode.
     auto caps = m_capturer->caps();
+    if (caps)
+        caps = adoptGRef(gst_caps_normalize(gst_caps_copy(caps.get())));
     for (unsigned i = 0; i < gst_caps_get_size(caps.get()); i++) {
         GstStructure* str = gst_caps_get_structure(caps.get(), i);