View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0008365||ardour||bugs||public||2020-08-17 19:23||2020-11-21 20:10|
|Summary||0008365: Randomly introduced latency|
|Description||I'm using Ardour 6.2.43 (rev 6.2-43-g15fcb5c782) - I've recently noticed random latency problems on certain tracks. Suddenly my drums or bass synth would start lagging behind the click track by 0000071:0000060 ms.|
At first I thought it's a problem with some plug-ins I'm using, I suspected LSP, as I've used them a lot in the affected project.
But then it happened after I added submix bus to a Black Pearl Drumkit (Multi).
The MIDI track was fed into multiple audio buses. These also send signal to 2 Reverb Buses in varying amounts.
When I've created another bus and routed all the individual channel buses to it - the whole drum line started to noticeably lag behind the rest of the track (quite a surreal sound).
Because of that I started suspecting that the problem might be caused by Ardour itself. Also - I'm not really using any plug-ins that I haven't been using in previously and I've never had such random latency introduced.
If I manually set the latency of my instrument plug-ins - it lets me compensate for it, but then the unexpected latency randomly goes away and my tracks start to rush instead of lagging.
After reloading the session - the latency problems seem to be gone, but re-appear randomly at times.
Here's a video I've quickly made to demonstrate the problem:
Can anyone reproduce this?
||Does it still happen when using jack or ALSA|
Preferences > Appearance > Toolbar > Display Latency Compensation Info
Does the I/O Latency show "ambiguous latency"?
||I'm gonna check when I encounter this again.|
||I have this problem all the time now. And from what I have observed it applies to all newly added tracks and buses. And the only solution is to reload the project. And doing it every time I add new track is very anoying.|
||@janisl This sounds like an issue with JACK2. Does using Ardour/ALSA (no JACK) help? Is this with Ardout 6.3.0 ?|
||@x42 Yes, with ALSA it works fine. It's 6.3.0.|
> After reloading the session - the latency problems seem to be gone, but re-appear randomly at times.
Could it be that you have changed jack's buffersize while Ardour is running? and from then on there were inconsistencies (existing tracks newly created ones)?
||I don't change buffer size, and I can reproduce this every time.|
|2020-08-17 19:23||unfa||New Issue|
|2020-08-17 19:23||unfa||Tag Attached: latency|
|2020-10-27 08:30||soundguy30||Note Added: 0025163|
|2020-10-28 16:50||x42||Note Added: 0025178|
|2020-10-28 17:43||unfa||Note Added: 0025180|
|2020-11-06 08:17||janisl||Note Added: 0025202|
|2020-11-06 09:59||x42||Note Added: 0025203|
|2020-11-06 12:31||janisl||Note Added: 0025205|
|2020-11-09 17:14||x42||Note Added: 0025210|
|2020-11-11 14:53||janisl||Note Added: 0025214|
|2020-11-21 20:10||x42||Relationship added||related to 0008472|