Support huggingface Video feature

PiperOrigin-RevId: 770677201

Author: The TensorFlow Datasets Authors

tensorflow_datasets/core/features/video_feature.py

@@ -93,7 +93,7 @@ class Video(sequence_feature.Sequence):
 
   def __init__(
       self,
-      shape: Sequence[Optional[int]],
+      shape: Sequence[Optional[int]] | None = None,
       encoding_format: str = 'png',
       ffmpeg_extra_args: Sequence[str] = (),
       use_colormap: bool = False,
@@ -121,6 +121,8 @@ def __init__(
       ValueError: If the shape is invalid
     """
     dtype = tf.dtypes.as_dtype(dtype)
+    if not shape:
+      shape = (None, None, None, None)
     shape = tuple(shape)
     if len(shape) != 4:
       raise ValueError('Video shape should be of rank 4')

tensorflow_datasets/core/utils/huggingface_utils.py

@@ -119,6 +119,8 @@ def convert_hf_features(hf_features) -> feature_lib.FeatureConnector:
           sample_rate=hf_features.sampling_rate,
           dtype=np.int32,
       )
+    case hf_datasets.Video():
+      return feature_lib.Video()
 
   raise TypeError(f'Type {type(hf_features)} is not supported.')