Add fp16 filename check

lvsfunc/models/base.py

@@ -1,3 +1,4 @@
+from warnings import warn
 import importlib.resources as pkg_resources
 
 from stgpytools import FileWasNotFoundError, SPath
@@ -24,7 +25,14 @@ def _get_model_path(sub_dir: str, model_name: str, fp16: bool = True) -> SPath:
     if not fp16:
         return model_path
 
-    return model_path.with_name(model_path.stem.split('_fp32')[0] + '_fp16.onnx')
+    new_path = model_path.with_name(model_path.stem.split('_fp32')[0] + '_fp16.onnx')
+
+    if new_path.exists():
+        return new_path
+
+    warn(f'{model_name}: Could not find fp16 model! Returning fp32 model instead.')
+
+    return model_path
 
 
 # Paths to every model. Should always end with _fp32.onnx, we swap it out later if necessary.

lvsfunc/models/delowpass.py

@@ -51,6 +51,11 @@ def apply(self, clip: vs.VideoNode, **kwargs: Any) -> vs.VideoNode:
         """
         Apply the delowpass model to the clip.
 
+        WARNING: These models are only for horizontal lowpassing!
+        They will also mess up any random high-frequency content in the image.
+        Practically speaking, this almost always means compression noise.
+        Make sure you properly preprocess your video before using these models!
+
         Example usage:
 
         .. code-block:: python
@@ -73,15 +78,17 @@ def apply(self, clip: vs.VideoNode, **kwargs: Any) -> vs.VideoNode:
         except ImportError:
             raise DependencyNotFoundError("vsmlrt", self._func)
 
-        func = FunctionUtil(clip, self.__class__, kwargs.pop('planes', 0), vs.RGB, 32)
+        fp16 = kwargs.pop('fp16', False)
+
+        model_path = _get_model_path('delowpass', str(self).split('(')[0], fp16)
+        fp16 = 'fp16' in model_path.stem
+
+        func = FunctionUtil(clip, self.__class__, kwargs.pop('planes', 0), vs.RGB, 16 if fp16 else 32)
 
-        fp16 = kwargs.pop('fp16', func.bitdepth != 32)
         matrix = Matrix.from_param_or_video(kwargs.pop('matrix', None), clip)
 
         work_clip = Lanczos.resample(func.work_clip, vs.RGBS, matrix_in=matrix)
 
-        model_path = _get_model_path('delowpass', str(self).split('(')[0], fp16)
-
         if self.backend is None:
             self.backend = autoselect_backend(fp16=fp16)