A: Japanese animators often render in 60fps and high bitrate. A 5-minute anime MV can be 500MB. Use HandBrake post-download to compress it without losing quality.
(Interesting piece): If you're specifically looking for a Japanese YouTube video downloader, you might want to try NNDC (NicoNico Douga Converter) or Gyao! Video Downloader . However, please note that these tools might be in Japanese, and their compatibility with YouTube's terms of service is uncertain. japanese youtube video downloader