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Re: record stream using time limit, reconnecting as needed

From: Roger
Subject: Re: record stream using time limit, reconnecting as needed
Date: Wed, 22 Feb 2023 06:40:48 -0500

> On Wed, Feb 22, 2023 at 04:21:14PM +0900, Koichi Murase wrote:
>2023???2???22???(???) 12:52 Roger <>:
>> However, I'm still stumped for how to background an endless loop with the
>> included ffmpeg stream recording, so the stream is easily reconnected if
>> dropped, while falling through to get the PID of the backgrounded endless 
>> loop
>> or ffmpeg, for killing after so many (eg 30) minutes?
>If you specify a negative integer (e.g. -<PGID> where <PGID> is an
>integer) to `kill', `kill' will kill all the processes that belong to
>the process group PGID. You can give a distinct process group ID to
>the background while loop by specifying `set -m' before starting the
>background job. Then you can pass the PGID (i.e., the PID of the
>`while' loop) to `kill' to kill all the processes including ffmpeg. In
>this way, you do not need to directly specify the PID of ffmpeg. This
>is an example.
>#!/usr/bin/env bash
>record() {
>  local -
>  set -m
>  while true; do
>    ffmpeg http://some.url.m3u8
>  done & pgid_task="${!}"
>sleep_while_recording() { sleep 30m; }
>kill -INT -"$pgid_task"

Looks like what I've been missing.  Especially if ffmpeg -reconnect(options) 
are not reliable.

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