scte27: use the frame duration in vlc_tick_t

modules/codec/scte27.c

@@ -358,33 +358,33 @@ static subpicture_t *DecodeSubtitleMessage(decoder_t *dec,
             subpicture_region_Delete(region);
             return NULL;
         }
-        int frame_duration;
+        vlc_tick_t frame_duration;
         switch (display_standard) {
         case 0:
             sub->i_original_picture_width  = 720;
             sub->i_original_picture_height = 480;
-            frame_duration = 33367;
+            frame_duration = VLC_TICK_FROM_US(33367);
             break;
         case 1:
             sub->i_original_picture_width  = 720;
             sub->i_original_picture_height = 576;
-            frame_duration = 40000;
+            frame_duration = VLC_TICK_FROM_MS(40);
             break;
         case 2:
             sub->i_original_picture_width  = 1280;
             sub->i_original_picture_height =  720;
-            frame_duration = 16683;
+            frame_duration = VLC_TICK_FROM_US(16683);
             break;
         case 3:
             sub->i_original_picture_width  = 1920;
             sub->i_original_picture_height = 1080;
-            frame_duration = 16683;
+            frame_duration = VLC_TICK_FROM_US(16683);
             break;
         default:
             msg_Warn(dec, "Unknown display standard");
             sub->i_original_picture_width  = 0;
             sub->i_original_picture_height = 0;
-            frame_duration = 40000;
+            frame_duration = VLC_TICK_FROM_MS(40);
             break;
         }
         sub->b_absolute = true;