From 538f2aeaefb0272da66a921cf0ed9aad30f09206 Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey.vfx@gmail.com>
Date: Mon, 17 Jun 2019 17:52:02 +0200
Subject: [PATCH] Fix AV-sync sometimes putting scene one frame back

---
 source/blender/editors/screen/screen_ops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index f6034a7051e..1a146f5bd07 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -4243,7 +4243,7 @@ static int screen_animation_step(bContext *C, wmOperator *UNUSED(op), const wmEv
         scene->r.cfra++;
       }
       else {
-        scene->r.cfra = newfra + 0.5;
+        scene->r.cfra = max_ii(scene->r.cfra, newfra + 0.5);
       }
 
 #ifdef PROFILE_AUDIO_SYNCH