[FFmpeg-user] hls playlist got wiped out when ffmpeg runs as systemd child process

Reindl Harald h.reindl at thelounge.net
Fri Jul 8 23:30:18 EEST 2022

Am 08.07.22 um 18:16 schrieb Greg Oliver:
> On Fri, Jul 8, 2022 at 5:25 AM jb <jonbae77 at gmail.com> wrote:
>> Hello everybody,
>> I have a control program which running as a systemd service. This
>> program spawns ffmpeg and that is writing to a HLS playlist. I use this
>> flags:
>>      -hls_flags append_list+delete_segments+omit_endlist+program_date_time
>> The interesting thing is, when I stop the systemd process my HLS
>> playlist got wiped out and when I start the service again ffmpeg will
>> not continue the playlist, instead it writes a new one.
>> When I run my control program directly from shell, I don't have this
>> behavior. I can stop the program and start it again and the HLS playlist
>> will continue.
>> Does anybody notice this different behaviors? And has an idea why this
>> is happen and what I can do here?
> systemd is not stateful - unless you create stateful files with your
> exec{pre,post,start} stanzas, it will get overwritten every time

"systemd is not stateful" means nothing on it's own
stateful *for what*

even "PrivateTmp" is *not* default enabled, but when you enable it and 
your application trie sto re-use files in /tmp they are gone

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