diff --git a/.slashrc b/.slashrc
index eedec6fe..cf97d5fa 100644
--- a/.slashrc
+++ b/.slashrc
@@ -88,6 +88,12 @@ class MediaPlugin(slash.plugins.PluginInterface):
     parser.add_argument("--parallel-metrics", action = "store_true")
     parser.add_argument("--platform", default = None, type = str, required = True)
     parser.add_argument("--device", default = '/dev/dri/renderD128', type = str, help = 'vaapi-fits run with render device')
+    parser.add_argument("--stringapi", default = 0,
+      type = int, help = (
+        f"{int(0)}   = default, disabled string api; "
+        f"{int(1)}   = only enabled string api; "
+        f"{int(2)}   = random call parameters with enabling and disabling string api"
+        " (default: %(default)i)"))
 
   def configure_from_parsed_args(self, args):
     self.baseline = Baseline(args.baseline_file, args.rebase)
@@ -98,6 +104,7 @@ class MediaPlugin(slash.plugins.PluginInterface):
     self.ctapr = args.ctapr
     self.platform = args.platform
     self.render_device = args.device
+    self.stringapi = args.stringapi
 
     assert not (args.rebase and slash.config.root.parallel.num_workers > 0), "rebase in parallel mode is not supported"
     assert not (args.ctapt != -1 and slash.config.root.parallel.num_workers > 0), "ctapt in parallel mode is not supported"
@@ -209,6 +216,10 @@ class MediaPlugin(slash.plugins.PluginInterface):
     from lib.platform import info
     return info()["gpu"]["gen"]
 
+  def _get_platform_stringapi_enable(self):
+    from lib.platform import info
+    return info()["stringapi"]["enable"]
+
   def _get_call_timeout(self):
     if self.test_call_timeout > 0:
        return self.test_call_timeout
diff --git a/lib/caps/DG2/info b/lib/caps/DG2/info
index a809063f..6da6885c 100644
--- a/lib/caps/DG2/info
+++ b/lib/caps/DG2/info
@@ -10,4 +10,5 @@
 
 info = dict(
   gpu = dict(gen = 12.7),
+  stringapi = dict(enable = True),
 )
diff --git a/lib/ffmpeg/qsv/encoder.py b/lib/ffmpeg/qsv/encoder.py
index 99de3fbd..c3a7cc88 100644
--- a/lib/ffmpeg/qsv/encoder.py
+++ b/lib/ffmpeg/qsv/encoder.py
@@ -65,32 +65,10 @@ def map_profile_stringapi(self, codec, profile):
 
   @property
   def encparams(self):
-    _enc_params_stringapi = 0
-    _stringapi_param = 0
-    _cmdline_stringapi_param = vars(self).get("cmdline_stringapi_param", 0) #passed through from the test cases cmdline option
-    if _cmdline_stringapi_param == 1: #to call encparams_string_api
-      _stringapi_param = 1
-    elif _stringapi_param == 2: #the random is even, then to call encparams_string_api
-      _randint = random.randint(1,10)
-      if _randint%2==0: #even
-        _stringapi_param = 1
-      else:
-        _stringapi_param = 0
-    else:
-      _enc_params_stringapi = 0
-
-    #  check whether call encparams_string_api
-    _enc_params_stringapi = all([
-      vars(self).get("stringapi_platform_support", 0), #the platform whether support stringapi
-      _stringapi_param == 1,
-    ])
-
-    _enc_params_stringapi = 1
+    _enc_params_stringapi = vars(self).get("is_enc_params_stringapi", 0)
     if _enc_params_stringapi:
-      vars(self).setdefault("is_enc_params_stringapi", 1)
       return (f"{self.encparams_string_api}")
     else:
-      vars(self).setdefault("is_enc_params_stringapi", 0)
       return (
         f"{super().encparams}{self.ldb}"
         f"{self.iqfactor}{self.bqfactor}"
@@ -200,12 +178,29 @@ def encode(self):
     if vars(self).get("_encoded", None) is not None:
       get_media().artifacts.purge(self._encoded)
     self._encoded = get_media().artifacts.reserve(self.encoded_ext)
-    _is_enc_params_stringapi = vars(self).get("is_enc_params_stringapi", 0)
-    _is_enc_params_stringapi=1
-    if _is_enc_params_stringapi==1:
-      #if vars(self).get("_encoded", None) is not None:
-      #  get_media().artifacts.purge(self._encoded)
-      #self._encoded = get_media().artifacts.reserve(self.encoded_ext)
+
+    _enc_params_stringapi = 0
+    _stringapi_param = 0
+    _cmdline_stringapi_param = get_media().stringapi #passed through from the test cases cmdline option
+    if _cmdline_stringapi_param == 1: #to call encparams_string_api
+      _stringapi_param = 1
+    elif _cmdline_stringapi_param == 2: #the random is even, then to call encparams_string_api
+      _randint = random.randint(1,10)
+      if _randint%2==0: #even
+        _stringapi_param = 1
+      else:
+        _stringapi_param = 0
+    else:
+      _enc_params_stringapi = 0
+
+    #  check whether call encparams_string_api
+    _enc_params_stringapi = all([
+      get_media()._get_platform_stringapi_enable(), #the platform whether support stringapi
+      _stringapi_param == 1
+    ])
+
+    if _enc_params_stringapi == True:
+      vars(self).update(is_enc_params_stringapi=1)
       return call(
         f"{exe2os('ffmpeg')} -v verbose {self.hwinit}"
         f" -f rawvideo -pix_fmt {self.format} -s:v {self.width}x{self.height}"
@@ -215,6 +210,7 @@ def encode(self):
         f" -vframes {self.frames} -y {self.ffoutput}"
       )
     else:
+      vars(self).update(is_enc_params_stringapi=0)
       return call(
         f"{exe2os('ffmpeg')} -v verbose {self.hwinit}"
         f" -f rawvideo -pix_fmt {self.format} -s:v {self.width}x{self.height}"