#581196 Time synchronisation problem between jackdmp(jack2) and ardour

Package:
ardour
Source:
ardour
Description:
the digital audio workstation
Submitter:
Stijn Declercq
Date:
2025-08-17 17:47:29 UTC
Severity:
normal
Tags:
#581196#5
Date:
2010-05-11 14:21:34 UTC
From:
To:
Hi

Since I upgraded to jack-1.9.5, Ardour fails in time synchronisation with jack.

If I have recorded a track and I want to play it again then it is not possible.
Even if I do a 'rewind' with jack, Ardour always starts playing at the end of the recorded track.

If I set Ardour the use the internal timer, it is possible to go to the beginning of the track and play it, so it's related to jack transport.

There are no problems with Jack-0.118.

I have builded Ardour 2.8.7 from source, but it has the same problem. Only Ardour3 seems ok but not stable, so not suitable.
#581196#10
Date:
2010-05-27 08:11:03 UTC
From:
To:
Hi!

I usually don't run time synchronization, hence I currently don't know
what's right or wrong.

What I saw with jackd2:

  * if set to internal time, everything is fine
  * if set to JACK time, "time master" needs to be switched off

If you enable time master, then you can't reposition the playhead,
that's probably what you're experiencing and what's the bug about.

You want JACK time with time master set, right?


ardour authors don't think it's an ardour bug, so I'm going to discuss
it with the jackd2 team, but I need to know the expected (jackd1)
behaviour.

Could you provide this additional information?


TIA
#581196#13
Date:
2010-05-27 08:11:03 UTC
From:
To:
Hi!

I usually don't run time synchronization, hence I currently don't know
what's right or wrong.

What I saw with jackd2:

  * if set to internal time, everything is fine
  * if set to JACK time, "time master" needs to be switched off

If you enable time master, then you can't reposition the playhead,
that's probably what you're experiencing and what's the bug about.

You want JACK time with time master set, right?


ardour authors don't think it's an ardour bug, so I'm going to discuss
it with the jackd2 team, but I need to know the expected (jackd1)
behaviour.

Could you provide this additional information?


TIA
#581196#18
Date:
2010-05-27 17:39:46 UTC
From:
To:
Op Thu, 27 May 2010 10:11:03 +0200
schreef Adrian Knoth <adi@drcomp.erfurt.thur.de>:


Hi Adrian,


Ouch. The timemaster was on. If I disabled timemaster the behouviar is
normal. Strange that with jack1 I didn't experienced this and I never
touched Timemaster AFAIK between switching over & over between jack1 &
2 in testing and unstable in the past.


Anyway you may close the bug ticket since everything looks normal.

I'm feeling little bit stupid now :-).
I apologize for the inconvenience.


Kindly regards,
Stijn