[BUG] rpicam-vid --initial option not working at all

[EwingKang]

Describe the bug
--initial pause for rpicam-vid does not prevent video from recording and timeout.
For example the following command finishes in ~7s and produces a correct length video without waiting for the user to press "Enter".

./rpicam-vid --camera 0 -n --frames 200 --width 1640 --height 1232 --level 4.2 --codec libav -o cam0_server.mp4 --initial pause -k

Neither -k nor --signal work.

Bug report
report_initial.txt

Additional context
I'm trying to use it with --sync and --signal option. I want to would start a client, start a server, and trigger the server/client with SIGUSR1.
Reference document: https://www.raspberrypi.com/documentation/computers/camera_software.html#rpicam-vid

[naushir]

Unfortunately, this is because of the use of the libav backend, which does not correctly support pause/split/segment, etc correctly. We will look into fixing this hopefully soon.