Convert datasets to av1 encoding (#302)

tests/data/lerobot/aloha_sim_insertion_human/meta_data/episode_data_index.safetensors

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+size 136

tests/data/lerobot/aloha_sim_insertion_human/meta_data/info.json

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tests/data/lerobot/aloha_sim_insertion_human/meta_data/stats.safetensors

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tests/data/lerobot/aloha_sim_insertion_human/train/data-00000-of-00001.arrow

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 size 100040

tests/data/lerobot/aloha_sim_insertion_human/train/state.json

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 size 247

tests/data/lerobot/aloha_sim_insertion_human/videos/observation.images.top_episode_000000.mp4

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