[Ardour-Users] time shift when recording from one midi track to another

[Paul Davis]

then this is a bug.

On Thu, Jan 25, 2018 at 6:00 PM, Victor <victor at svictor.net> wrote:

> Yes, the only input of track B is track A.
>
>
>
> Le 25 Jan 2018, Paul Davis <paul at linuxaudiosystems.com> a écrit :
>
> Did you ensure that track B was disconnected from all hardware inputs?
>>
>> On Thu, Jan 25, 2018 at 5:24 PM, Victor <victor at svictor.net> wrote:
>>
>> Hi,
>>>
>>> I’m trying to understand the following behavior in Ardour 5.12.0
>>>
>>> 1. Create 2 midi tracks, A and B
>>> 2. On track A, create a midi region and put 1 note every two beats in it
>>> (notes aligned to the grid).
>>> 3. On track B record the midi output of track A.
>>> I would have expected the resulting region on B to be an exact copy of
>>> the region on A. Instead, all notes on B are shifted
>>> slightly before the notes on A. The very first note of A is actually not
>>> rendered at all on B (maybe because it’d start too early before the B
>>> region).
>>> I attach a screenshot.
>>>
>>>
>>>
>>>
>>> Is this a side-effect of read-ahead latency compensation[1]?
>>> If so, can I set/disable the read-ahead time somewhere in Ardour?
>>>
>>> Looking at latency, I also wonder how to interpret the information in
>>> Window --> Audio/Midi Setup. It says that my buffer size is 128 samples
>>> and there is an additional 2.7ms between brackets after that. Is this
>>> a latency estimate? Qjackctl says that my latency is 8ms.
>>>
>>> I start jack from qjacktl with the following settings:
>>> Samplerate: 48000
>>> Frames/Period: 128
>>> Periods/Buffer: 3
>>>
>>> Regards,
>>> Victor
>>>
>>> [1]http://manual.ardour.org/synchronization/latency-and-late
>>> ncy-compensation/
>>>
>>>
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>>>
>>>
>
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