[FFmpeg-user] Split stream in equal chunks

[Marian Klymov]

I want to receive rtmp stream (using nginx-rtmp module), transcode it and
save it in chunks.
I would like to have splitting at specific times and to have all chunks
equal to 30.00 seconds (except first and last obviously). I've tried
playing with different parameters. segment_atclocktime looked like it
should do what I want but it creates chunks of different sizes. Originally
I thought that this is because of keyframes, but even with -g 1 it fails
sometimes.
My last try looks like this https://pastebin.com/raw/dYED4YXQ Is it
possible to do such thing with ffmpeg or do I need to implement some
heuristics with trying to resplit chunks outside?