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Speaker
A speaker is a person in the video. Every annotation belongs to one speaker. Each new video starts with one speaker, named "Speaker 1". You can add more speakers, rename them, and change their order. You cannot delete the last one. If you delete a speaker, GRAPE MARS also deletes the annotations that belong to it.
Example: A classroom video has 3 speakers: "Teacher", "Student A" and "Student B". The coder marks the teacher first, and then watches the lesson again for each student.
Why it matters in GRAPE MARS
The speaker tabs let you move from one person to the next. Every annotation you make then belongs to that person. This is how you compare a teacher with a student, or 2 students with each other.