Fix bug for mp4 in h5 (#882)

zhaomingwork

2023-08-21 50d6c96383a45b5e1c520468f6cd62551e1f49da

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from abc import ABC
from abc import abstractmethod
from typing import Iterator
 
 
class AbsIterFactory(ABC):
    @abstractmethod
    def build_iter(self, epoch: int, shuffle: bool = None) -> Iterator:
        raise NotImplementedError