I volunteer in a fansub group that TL’s Japanese anime raws 24 hours after into English ince it is retrieved from Tokyo braodcast. H264 has been the de facto fave amongst downloaders but the format MKV even after all this time, is still alien to the general populace, so sometimes fansub groups use AVI format instead.
You of all ppl should know why then...hardsubs don’t work AT ALL on BS Player for MKV’s. As popular as that player is, well...