[j_cool]

Ihry,

I was thinking about the gap between chunks.

I was not sure about how much we are missing there and you made it clear that it is nothing missing there but extra 1 sec or 2.

That can be trimmed before concatenation.

Somebody may answer how to know the number of extra seconds ( when is 1, when are 2 ) or how to find it out.

Jumps would irritate if that were few seconds chunks.

In 2 minutes chunks I personally don't mind the jump.

Some beta or irregular release of rtmpdump or ffmpeg that would write those 2 minutes chunks to ONE FILE without overwriting would work fine for me.