--- a/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.cpp
+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.cpp
@@ -135,6 +135,10 @@
 
     auto* bin = gst_bin_new(nullptr);
     auto* videorate = makeGStreamerElement("videorate"_s, "videorate"_s);
+    // The capture pipeline runs with base time 0, so buffer PTS are absolute
+    // CLOCK_MONOTONIC values. Without skip-to-first, videorate fills the gap
+    // from segment start with uptime x fps duplicate frames (WebKit PR 74373).
+    g_object_set(videorate, "skip-to-first", TRUE, nullptr);
 
     // The workaround below doesn't seem necessary anymore in GStreamer 1.28 and beyond.
     // Fixed by: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/6f623af4d745efaacd0c8639b99536def4a65c78