D222097

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RuntimeError: There were no tensor arguments to this function (e.g., you passed an empty list of Tensors), but no fallback function is registered for schema aten::_cat.

I guess `"dataset_name": "ImageDirectory"` should be "VideoDirectory", and there are also some details that need to be changed in _VideoDirectory_ and _dataset_loader_.

How to start with WebRTC

> I also encounter this issue. Have you solved it yet? I've switched to using X-server now.