actev_system_setup - (dev=False)
actev_design_chunks - (file_index, activity_index, output, nb_videos_per_chunk)
actev_experiment_init - (file_index, activity_index, chunks, video_location, system_cache_dir, config_file=None)
actev_pre_process_chunk - (chunk_id, system_cache_dir)
actev_process_chunk - (chunk_id, system_cache_dir)
actev_post_process_chunk - (chunk_id, system_cache_dir)
actev_reset_chunk - (chunk_id, system_cache_dir)
actev_merge_chunks - (result_location, output_file, chunks_file, chunk_ids, system_cache_dir)
actev_experiment_cleanup - (system_cache_dir)
