[syslog-ng] syslog-ng for filtering and execute external application

[Péter, Kókai]

Hello,

'I have the question, if I could use syslog-ng to filter the start and stop
of the stream'
Yes, it can filter those messages (disclaimer without seeing those
messages).

'and execute an action "ffmpeg stop" and "delete video segments". '
It was not something syslog-ng is designed to, but for example you could
use program destination to execute arbitrary executable (like s small
script to call ffmpeg stop).

You could do something like this (not tested) to have separate things to do
based on start/stop:

@version: 3.20
source xupnpd2 {
  stdin(flags(no-parse));
};

destination start {
  program("/usr/bin/do-start-magic.sh");
};

destination stop {
  program("/usr/bin/do-stop-magic.sh");
};

log { source(xupnpd2); filter { program("xupnpd2") AND message("start"); };
destination(start); };
log { source(xupnpd2); filter { program("xupnpd2") AND message("stop"); } ;
destination(stop); };


Each log/event is a single new line to the program stdin, which it should
process.

--
Kokan



On Wed, Apr 24, 2019 at 2:36 PM Thomas Schmiedl <thomas.schmiedl at web.de>
wrote:

> Hello,
>
> I use the mediaserver xupnpd2 (https://github.com/clark15b/xupnpd2) on
> the router to show HLS streams on the TV. Unfortunately, the software is
> no longer maintained by the original developer (I'm not a developer
> myself). The HLS processing would have to be revised.
>
> My idea is to start a ffmpeg and a local web server on the router, if I
> want to display the stream (the script xupnpd.lua will be executed,
> which starts ffmpeg etc.). Unfortunately there is not such a script when
> terminating the stream (exit ffmpeg etc.).
>
> xupnpd2 uses a log where you can track the start as well as the ending
> of the stream. Since the router has only a small amount of internal
> memory to write and analyze a logfile, I have the question, if I could
> use syslog-ng to filter the start and stop of the stream and execute an
> action "ffmpeg stop" and "delete video segments". I have very little
> Linux knowledge, maybe you can help me.
>
> Here is the excerpt from the xupnpd2 log (Loglevel 8).
>
> When starting the stream:
> run child, pid = 1715
> using handler 'hls' for '... URL ...'
>
> When stopping the stream:
> exit child, pid = 1715
>
> Best regards,
> Thomas Schmiedl
>
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>
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