feat(args): add train_resolution validation for video frames and resolution

- Add validation to ensure (frames - 1) is multiple of 8
- Add specific resolution check (480x720) for cogvideox-5b models
- Add error handling for invalid resolution format

finetune/schemas/args.py

@@ -133,14 +133,19 @@ class Args(BaseModel):
         return v
     
     @field_validator("train_resolution")
-    def validate_train_resolution(cls, v: str, info: ValidationInfo) -> str:
+    def validate_train_resolution(cls, v: Tuple[int, int, int], info: ValidationInfo) -> str:
         try:
-            # Parse resolution string "frames x height x width"
-            frames, height, width = map(int, v.split("x"))
+            frames, height, width = v
             
-            # Check if frames is multiple of 8
-            if frames % 8 != 0:
-                raise ValueError("Number of frames must be a multiple of 8")
+            # Check if (frames - 1) is multiple of 8
+            if (frames - 1) % 8 != 0:
+                raise ValueError("Number of frames - 1 must be a multiple of 8")
+            
+            # Check resolution for cogvideox-5b models
+            model_name = info.data.get("model_name", "")
+            if model_name in ["cogvideox-5b-i2v", "cogvideox-5b-t2v"]:
+                if (height, width) != (480, 720):
+                    raise ValueError("For cogvideox-5b models, height must be 480 and width must be 720")
                 
             return v