bridge: use VLC_TS_INVALID (refs #3135)

modules/stream_out/bridge.c

@@ -291,7 +291,7 @@ static sout_stream_id_t * AddOut( sout_stream_t *p_stream, es_format_t *p_fmt )
     p_es->b_empty = false;
 
     p_es->id = NULL;
-    p_es->i_last = 0;
+    p_es->i_last = VLC_TS_INVALID;
     p_es->b_changed = true;
 
     msg_Dbg( p_stream, "bridging out input codec=%4.4s id=%d pos=%d",
@@ -436,8 +436,8 @@ static int OpenIn( vlc_object_t *p_this )
     var_Get( p_stream, SOUT_CFG_PREFIX_IN "placeholder-delay", &val );
     p_sys->i_placeholder_delay = (mtime_t)val.i_int * 1000;
 
-    p_sys->i_last_video = 0;
-    p_sys->i_last_audio = 0;
+    p_sys->i_last_video = VLC_TS_INVALID;
+    p_sys->i_last_audio = VLC_TS_INVALID;
     p_sys->id_video = NULL;
     p_sys->id_audio = NULL;