Merge "Adjust some parameters for cyclic refresh for low bitrates."

rate_hist.c

diff --git a/rate_hist.c b/rate_hist.c
index 1cef19b..a77222b 100644
--- a/rate_hist.c
+++ b/rate_hist.c
@@ -88,6 +88,9 @@
   if (now < cfg->rc_buf_initial_sz)
     return;
 
+  if (!cfg->rc_target_bitrate)
+    return;
+
   then = now;
 
   /* Sum the size over the past rc_buf_sz ms */