-start timestamp doesn't match Twitch player sometimes

[ctian1]

with some VODs, the clip downloaded doesn't match the timestamp inputted based on what the Twitch player displays at that timestamp.
ex: with VOD 558361951
with argument -start="7 16 20"

this is a frame 10 seconds into the clip downloaded with concat, so it should be 7:16:30

on the twitch player: this frame is actually at 7:16:26

This offset is not constant either, at -start="0 3 10" of the same VOD concat is about 10 seconds ahead of the Twitch player

[ctian1]

Seems the "issue" is that chunks do not always begin at a multiple of 10 seconds because some chunks are slightly +/- 10 seconds