[FFmpeg-devel] [PATCH 3/3] avdevice: use av_gettime_relative() for timestamps

[Kieran Kunhya]

Sent from my mobile device

On Sun, 7 Feb 2021, 19:21 Nicolas George, <george at nsup.org> wrote:

> Kieran Kunhya (12021-02-07):
> > NTP is allowed to jump when it wants for example. It's not trivial for
> the
> > user to guarantee this.
>
> In practice, it does not.
>

Read the docs where it explains where it can jump.


> > Exactly, so by default you must give the user a clock which is guaranteed
> > not to jump as you don't know. If they need to synchronise between PCs
> > using your naive process they can choose gettimeofday.
>
> So why are you still arguing this?
>
> > Hopefully they understand the consequences of that unlike you. It's
> > still a flawed process because of timestamp jitter etc.
>
> I obviously understand the consequences better than you, since you did
> not even realize why the wall time clock was needed.
>

Your scenario is contrived. Its impossible to sync exactly between
different machines for all the reasons I explained and you didn't
understand.

I think this should be the end of the discussion.
>

Yes, since you are not interested in reading the NTP docs or understanding
the purpose of a monotonic clock.

Kieran


> Regards,
>
> --
>   Nicolas George
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