Hi Vivi,
I might be wrong but I thought it was a Viki direction that line breaks are not used. Irmar’s post below refers to this.
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I haven’t come across the below post before but in March of 2020, @mariliam specifically mentioned that breaks can be used in long lines of dialogue. (I’m guessing that Mariliam is Viki staff.) Now I’m confused.
https://support.viki.com/hc/en-us/articles/218654277-Adding-breaks-in-subtitles
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Lastly, the current guidelines seem to be a little vague when it comes to using line breaks for a single speaker. It’s not mentioned specifically. I’m not sure if these guidelines are assembled by Viki staff or people who are volunteers.
https://nssacademy.weebly.com/subtitling-guide.html
Manganese