Watching Japanese media for listening practice – is it necessary to write down all the words I don’t know so I can study them later?

I watch movies for listening practice, these are Japanese dubs of movies I've seen before in my native language, so I have a rough gist of what's being said. I understand 70-80% of what's being said. If I encounter a word I don't know, I pause the video and write it down so I can study it later.

My reasoning for writing down all of these words is:

  1. I want to go from 70% understanding to 100%. I'm not good at learning through osmosis and will not remember the new words if I can't go back and study them.
  2. Even if I can understand the gist of a new word, it takes more work to be able to use the word myself. Expanding vocabulary is important for speaking fluency
  3. These words might not appear frequently in other places, or might be used primarily in spoken rather than written language. So if I don't learn them now, I might not come across them again for a while

However even if I more or less understand the meaning of a sentence, each sentence will still have multiple words I haven't encountered before. This means frequently pausing the video to write down words, which interferes with listening practice – it can take me an hour to get through ten minutes of a movie.

Is the mentality that "I need to learn specifically this list of words" overthinking things, and leading to less efficient study?

by OkIdeal9852

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