Hey, indeed Whisper can do the transcription of Japanese and even the translation (but only to English). For the best results you need to use the largest model which depending on your hardware might be slow or fast.
Another option is to use something like VideoToTextAI which allows you to transcribe it fast and then translate it into 100+ languages which you can then export the subtitle (SRT) file for
Another option is to use something like VideoToTextAI which allows you to transcribe it fast and then translate it into 100+ languages which you can then export the subtitle (SRT) file for