From e3ace094c509bd04b3b15109c943a4a2419530e1 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Sat, 24 Feb 2018 15:09:08 +0100
Subject: [PATCH] realvideo2: fix dequant for I-frames

---
 src/codecs/h263/rv20.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/codecs/h263/rv20.rs b/src/codecs/h263/rv20.rs
index 3298fab..c734bc9 100644
--- a/src/codecs/h263/rv20.rs
+++ b/src/codecs/h263/rv20.rs
@@ -128,7 +128,7 @@ impl<'a> RealVideo20BR<'a> {
                 };
 
         let rl_cb = if sstate.is_iframe { &self.tables.aic_rl_cb } else { &self.tables.rl_cb };
-        let q_add = if quant == 0 { 0i16 } else { ((quant - 1) | 1) as i16 };
+        let q_add = if quant == 0 || sstate.is_iframe { 0i16 } else { ((quant - 1) | 1) as i16 };
         let q = (quant * 2) as i16;
         while idx < 64 {
             let code = br.read_cb(rl_cb)?;
-- 
2.39.5