View Issue Details

IDCategoryLast Update
0008472bugs2020-11-25 10:36
Reportermartin.vlkAssigned To 
Status newResolutionopen 
PlatformUbuntuOSLinuxOS Version(any)
Product Version6.3 
Fixed in Version 
Summary0008472: Newly added audio tracks are not correctly compensated for latency until Ardour session is reloaded
DescriptionWhen I add one track to a new sassion, the compensation works fine.
On a second and next newly added tracks latency compensation is wrong, leading to the recording being off.


related to 0008365 new Randomly introduced latency 



2020-11-21 20:10

administrator   ~0025247

I cannot reproduce this. Does this only happen with jack? and if so which version of jack?


2020-11-21 20:16

reporter   ~0025248

Ah, yes I forgot to mention it is with JACK v1.9.12


2020-11-21 22:59

reporter   ~0025249

I'm affected by this issue as well and it's quite easy to see that adding tracks to loaded session are not in sync with the existing tracks. This covers both audio and midi tracks.

As requested I did a "jack_lsp -l" after
1. adding a track to existing project
2. saving the project and reloading it

Ardour_jack_latency_dbg.log (8,228 bytes)


2020-11-21 23:04

reporter   ~0025250

I'll upload to new file as the copy & paste from terminal was borked in the last post and this forum does not seem to support editing.

Ardour_jack_latency_dbg2.log (9,731 bytes)


2020-11-21 23:47

reporter   ~0025251

And before forgetting I also have JACK2 1.9.12 so that seems to match.


2020-11-21 23:57

reporter   ~0025252

Also this seems to consider only new tracks being added to existing projects. After saving and loading a project everything is in sync again.

To mitigate this issue a pool of needed (audio, midi, bus) tracks can be created in advance and then saving and loading the project again as changing tracks routing and plugins does not affect the latency.


2020-11-25 10:36

reporter   ~0025267

I can confirm this issue with Ardour 6.3 on Ubuntu 20.4 using JACK. I also have this problem when I use the import dialog to load an audio file into a new track of an existing project.

Issue History

Date Modified Username Field Change
2020-11-21 20:08 martin.vlk New Issue
2020-11-21 20:10 x42 Relationship added related to 0008365
2020-11-21 20:10 x42 Note Added: 0025247
2020-11-21 20:16 martin.vlk Note Added: 0025248
2020-11-21 20:17 martin.vlk Tag Attached: jack
2020-11-21 22:59 Xard File Added: Ardour_jack_latency_dbg.log
2020-11-21 22:59 Xard Note Added: 0025249
2020-11-21 23:04 Xard File Added: Ardour_jack_latency_dbg2.log
2020-11-21 23:04 Xard Note Added: 0025250
2020-11-21 23:47 Xard Note Added: 0025251
2020-11-21 23:57 Xard Note Added: 0025252
2020-11-25 10:36 consint Note Added: 0025267