ffmpeg - How to record from start of a live stream?

[Alzarius]

Sorry for the newbie question. I've looked over the ffmpeg documentation and can't figure out how to record a live stream that's already in progress from the beginning.

When I enter:

ffmpeg -i <input m3u8> -codec copy out.ts

it always starts at the current time. Is there a switch that let's me record from the beginning, or maybe even specifying a start time in the stream?

I tried -ss and -itsoffset options and those don't produce the results I want.

Thanks.