encoder: adapt quality parameters

Change-Id: Iad2fefccbe4921e0ae612391bd2c83adab77c3c2

src/media/media_encoder.cpp

@@ -52,8 +52,8 @@ extern "C" {
 
 namespace jami {
 
-constexpr double LOGREG_PARAM_A {114.40432};
-constexpr double LOGREG_PARAM_B {-6.049181};
+constexpr double LOGREG_PARAM_A {79};
+constexpr double LOGREG_PARAM_B {-4.};
 
 MediaEncoder::MediaEncoder()
     : outputCtx_(avformat_alloc_context())