Is there an existing issue for this?

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Bug description

When running extract_frames with mode='manual' and videos_list=None, video paths are pulled from the config file as a dictionnary (videos = cfg.get("video_sets_original") or cfg["video_sets"]) but are indexed as a list (_ = launch_napari(videos[0])):

Operating System

Ubuntu

DeepLabCut version

dlc version

DeepLabCut mode

single animal

Device type

gpu

Steps To Reproduce

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Relevant log output

Anything else?

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