stream_out: keep caching value in the mux_sys_t struct iso of asking it every time.

include/vlc_sout.h

@@ -156,6 +156,7 @@ struct  sout_mux_t
     bool  b_waiting_stream;
     /* we wait one second after first stream added */
     mtime_t     i_add_stream_start;
+    mtime_t     i_caching;
 };
 
 enum sout_mux_query_e

src/stream_output/stream_output.c

@@ -432,6 +432,7 @@ sout_mux_t * sout_MuxNew( sout_instance_t *p_sout, char *psz_mux,
     p_mux->b_add_stream_any_time = false;
     p_mux->b_waiting_stream = true;
     p_mux->i_add_stream_start = -1;
+    p_mux->i_caching = var_GetInteger( p_mux->p_sout, "sout-mux-caching" ) * INT64_C(1000);
 
     vlc_object_attach( p_mux, p_sout );
 
@@ -592,13 +593,16 @@ void sout_MuxSendBuffer( sout_mux_t *p_mux, sout_input_t *p_input,
     {
         mtime_t current_date = mdate();
         if ( current_date > p_buffer->i_dts )
+        {
             msg_Warn( p_mux, "late buffer for mux input (%"PRId64")",
                       current_date - p_buffer->i_dts );
+            p_mux->b_waiting_stream = false;
+        }
     }
 
     if( p_mux->b_waiting_stream )
     {
-        const int64_t i_caching = var_GetInteger( p_mux->p_sout, "sout-mux-caching" ) * INT64_C(1000);
+        const int64_t i_caching = p_mux->i_caching;
 
         if( p_mux->i_add_stream_start < 0 )
             p_mux->i_add_stream_start = p_buffer->i_dts;