I dont think I was very clear
for frames, you have to be in frame mode.
+231 will add to the position of the playhead in this case from 0 to 231.
If you type in +10 it will add 10 frames > 241,
type in -20 it will set to 221.
In timecode it's min, sec, frames
231 in timecode means 2 seconds and 31 frames but as it is a 25 fps sequence its 31–25 = 6 frames
2 + 1 second and 6 frames = 3 seconds and 6 frames.
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