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I have Game of Thrones that shows subs when the other languages are being used, How do I set subs to work only when a foreign language is being spoken?
THAT depends on which version of Avatar you are talking about. On the version I have, Navi is built in to the video, so you don't want handbrake adding in any subtitle track. Others, it's a separate track for English, or English+Navi.
If you're doing subtitles from SRT files, you're at the mercy of whoever created the SRT file.
I take it you mean that the studio added the English subs when Navi is spoken, as I know there is no subtitle file in Navi. I have the extended version (7.38 GB) .
The official source for the file isn't going to have SRT subtitles, though. It will have either DVD or Bluray choices, limited to the official distribution disks as language. A 7.3GB file size is weird, because it's near the limit for DVD, but the lack of a log makes it hard to tell what you're seeing.
That is flat-out weird. The BD version of Avatar is 10GB after handbrake shrinks it. Almost 8GB and 1080p means it's had compression done before-hand.
The original BD came with two subtitle tracks for each language. There was a "full" track, and a non-human track that was much smaller. What you're after is the non-human track for your language. And I cannot say where you'll find it for the video you have.