diff --git a/video/out/vo.c b/video/out/vo.c
index 68af6a38c8..ae5eca7ba5 100644
--- a/video/out/vo.c
+++ b/video/out/vo.c
@@ -716,6 +716,7 @@ static bool render_frame(struct vo *vo)
                 .pts        = pts,
                 .next_vsync = next_vsync,
                 .prev_vsync = prev_vsync,
+                .vsync_offset = next_vsync - pts,
                 .frame = img,
                 .num_future_frames = num_future_frames,
                 .future_frames = future_frames,
diff --git a/video/out/vo.h b/video/out/vo.h
index 51c7816920..3d36269d26 100644
--- a/video/out/vo.h
+++ b/video/out/vo.h
@@ -160,6 +160,8 @@ struct frame_timing {
     // Realtime of estimated previous and next vsync events.
     int64_t next_vsync;
     int64_t prev_vsync;
+    // "ideal" display time within the vsync
+    int64_t vsync_offset;
     // The current frame to be drawn. NULL means redraw previous frame
     // (e.g. repeated frames).
     // (Equivalent to the mp_image parameter of draw_image_timed, until the