fix(from_video_info): fixing early validation issue in from_video_info

src/lerobot/configs/video.py

@@ -19,8 +19,8 @@
 from __future__ import annotations
 
 import logging
-from dataclasses import dataclass, field, fields
-from typing import Any, ClassVar
+from dataclasses import dataclass, field
+from typing import Any, ClassVar, Self
 
 from lerobot.utils.import_utils import require_package
 
@@ -112,9 +112,9 @@ class VideoEncoderConfig:
         self.validate()
 
     @classmethod
-    def from_video_info(cls, video_info: dict | None) -> VideoEncoderConfig:
-        """Reconstruct a :class:`VideoEncoderConfig` from a video feature's ``info`` block.
-        Missing or ``None`` values fall back to the class defaults.
+    def _kwargs_from_video_info(cls, video_info: dict | None) -> dict[str, Any]:
+        """Parse the ``video.*`` keys of a feature ``info`` block into
+        constructor kwargs.
         """
         video_info = video_info or {}
         kwargs: dict[str, Any] = {}
@@ -133,7 +133,15 @@ class VideoEncoderConfig:
                 continue
             kwargs[field_name] = value
 
-        return cls(**kwargs)
+        return kwargs
+
+    @classmethod
+    def from_video_info(cls, video_info: dict | None) -> Self:
+        """Reconstruct an encoder config from a video feature's ``info`` block.
+
+        Missing or ``None`` values fall back to the class defaults. 
+        """
+        return cls(**cls._kwargs_from_video_info(video_info))
 
     def detect_available_encoders(self, encoders: list[str] | str) -> list[str]:
         """Return the subset of available encoders based on the specified video backend.
@@ -291,23 +299,18 @@ class DepthEncoderConfig(VideoEncoderConfig):
     _DEFAULT_CHANNELS: ClassVar[int] = 1
 
     @classmethod
-    def from_video_info(cls, video_info: dict | None) -> DepthEncoderConfig:
-        """Reconstruct a :class:`DepthEncoderConfig` from a depth feature's ``info`` block.
-
-        Reuses :meth:`VideoEncoderConfig.from_video_info` for the base
-        codec/tuning fields and then layers the depth-specific tuning
-        (``depth_min`` / ``depth_max`` / ``shift`` / ``use_log``) on top.
-        Missing keys fall back to the class defaults.
+    def _kwargs_from_video_info(cls, video_info: dict | None) -> dict[str, Any]:
+        """Layer the depth-specific tuning (``depth_min`` / ``depth_max`` /
+        ``shift`` / ``use_log``) on top of the base parser. Missing keys
+        fall back to the class defaults.
         """
-        base = VideoEncoderConfig.from_video_info(video_info)
-        kwargs: dict[str, Any] = {f.name: getattr(base, f.name) for f in fields(base) if f.init}
-
+        kwargs = super()._kwargs_from_video_info(video_info)
         video_info = video_info or {}
         for name in DEPTH_ENCODER_INFO_FIELD_NAMES:
             value = video_info.get(f"video.{name}")
             if value is not None:
                 kwargs[name] = value
-        return cls(**kwargs)
+        return kwargs
 
 
 def depth_encoder_defaults() -> DepthEncoderConfig: