From 374a17366e8bbac63c28db270781057273838c20 Mon Sep 17 00:00:00 2001
From: Yaowu Xu <yaowu@google.com>
Date: Thu, 14 Mar 2013 12:31:27 -0700
Subject: [PATCH] force lossless coding at very high quality end

Change-Id: I75fc4eee10bee9efd419d248827290cce8e6d637
---
 vp9/encoder/vp9_encodeframe.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/vp9/encoder/vp9_encodeframe.c b/vp9/encoder/vp9_encodeframe.c
index 650e39b..b7b2700 100644
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -1292,7 +1292,9 @@ static void encode_frame_internal(VP9_COMP *cpi) {
   vp9_zero(cpi->mb_mv_ref_count);
 #endif
 
-  // force lossless mode when Q0 is selected
+  // force lossless mode
+  if (cm->base_qindex <= 4)
+    cm->base_qindex = 0;
   cpi->mb.e_mbd.lossless = (cm->base_qindex == 0 &&
                             cm->y1dc_delta_q == 0 &&
                             cm->uvdc_delta_q == 0 &&
-- 
2.7.4