diff --git a/src/picture.c b/src/picture.c
index 9739f6f..29d9d4e 100644
--- a/src/picture.c
+++ b/src/picture.c
@@ -468,12 +468,23 @@ VAStatus RequestEndPicture(VADriverContextP context, VAContextID context_id)
 	 * not be load-bearing for rkvdec's reference resolution — Phase 5
 	 * reviewer flagged this as low-probability (VP9/MPEG-2 use the same
 	 * pattern and PASS), but this is the only remaining wire-byte diff.
+	 *
+	 * iter30 DIAG: LIBVA_TS_SCALE env-gated multiplier so we can sweep
+	 * timestamp magnitude to test whether small-ts collides with stale
+	 * CAPTURE entries in vb2_find_buffer for HEVC frame 2+ divergence.
 	 */
 	context_object->timestamp_counter++;
-	surface_object->timestamp.tv_sec =
-		(time_t)(context_object->timestamp_counter / 1000000);
-	surface_object->timestamp.tv_usec =
-		(suseconds_t)(context_object->timestamp_counter % 1000000);
+	{
+		uint64_t ns = (uint64_t)context_object->timestamp_counter * 1000;
+		const char *scale = getenv("LIBVA_TS_SCALE");
+		if (scale && scale[0] != '\0') {
+			uint64_t mul = (uint64_t)strtoull(scale, NULL, 0);
+			if (mul > 0)
+				ns *= mul;
+		}
+		surface_object->timestamp.tv_sec = (time_t)(ns / 1000000000ULL);
+		surface_object->timestamp.tv_usec = (suseconds_t)((ns / 1000ULL) % 1000000ULL);
+	}
 
 	/*
 	 * iter6: request_fd was bound to the surface in BeginPicture from