View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0004312 | ardour | bugs | public | 2011-09-06 03:07 | 2020-04-19 20:15 |
| Reporter | lhm100 | Assigned To | paul | ||
| Priority | normal | Severity | major | Reproducibility | always |
| Status | closed | Resolution | fixed | ||
| Product Version | 3.0-alpha10 | ||||
| Target Version | 3.0-beta3 | ||||
| Summary | 0004312: Latency compensation issue | ||||
| Description | A track played and looped back into the interface and recorded on a separate track does not time-allign well. The offset Latency is equal to the typical values calculated for Jack, but is uncompensated. Does not appear to be a way to compensate for that latency. Jack -I and -O parameters appear to have no effect. [They do have an effect, and in a least a few cases, function correctly and solve the issue in 2.8.11.] This issue is independent of Jack 1.9.7 in synchronous or asynchronous mode (although the latency value does change as one would expect) Problem exists even with only 2 jack connections: "Track to hardware out" & "Capture to track in". All other connections removed. | ||||
| Additional Information | See: http://ardour.org/node/4551 Ubuntu Studio 11.04 Updated to 2.6.39.4 kernel Jackmp 1.9.7 rt via QjackClt Ardour 3.a10 | ||||
| Tags | No tags attached. | ||||
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alignment is perfect here. |
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Anything I can provide from here to help resolve issue? It is definitely not OK here - 22ms lag. One other test is to see if you can use the latency inputs to affect the timing, since I could not affect the timing at all with those inputs on 3a10, but could on 2.8. Thanks |
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i don't run jack2. so its hard to say if this is an issue with jack2 or something with ardour3. I've done *extensive* testing here (days and days) with many different i/o configuration, and a3 seems to be exactly correct given the information available. this is with current jack1. |
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Well... I'll run jack1 and see how that goes and report back. Should have results in a couple days... Many thanks. |
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With a change to Jack1, alignment is much better. Less than 1ms differential "out of the box". With a little manual tweaking of the input latency (-I) latency can be adjusted perfectly. So, issue is between A3 and Jack2. As discussed in the forum, A2.8.11 gets it right somehow with Jack2. Anyway, with Jack1, 3a10 works like one would expect. Thanks Paul. |
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I'm currently using jack2 on my studio setup. Is this issue to be resolved even for jack2? I'm asking because in this case I'd have to switch my whole setup to jack1, which can be painful.. Are there any other known shortcomings with jack2? |
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a3 and a2 have the same code for this, and jack1 and jack2 support the same API. i am not aware of any bugs at this time with either combination.if jack2 does not behave in the same way, it should be reported to the jack mailing list. |
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notes and IRC have confirmed that this issue is fixed with jack2 as of 1.9.8. |
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Issue has been closed automatically, by Trigger Close Plugin. Feel free to re-open with additional information if you think the issue is not resolved. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2011-09-06 03:07 | lhm100 | New Issue | |
| 2011-09-06 09:34 | cth103 | cost | => 0.00 |
| 2011-09-06 09:34 | cth103 | Target Version | => 3.0-beta1 |
| 2011-09-14 19:53 | paul | Note Added: 0011508 | |
| 2011-09-15 02:13 | lhm100 | Note Added: 0011517 | |
| 2011-09-15 02:25 | paul | Note Added: 0011518 | |
| 2011-09-16 00:34 | lhm100 | Note Added: 0011528 | |
| 2011-09-19 05:56 | lhm100 | Note Added: 0011537 | |
| 2011-11-15 15:01 | cth103 | Target Version | 3.0-beta1 => 3.0-beta2 |
| 2011-11-17 11:26 | vervelover | Note Added: 0012104 | |
| 2011-11-17 14:34 | paul | Note Added: 0012105 | |
| 2012-01-10 20:46 | cth103 | Target Version | 3.0-beta2 => 3.0-beta3 |
| 2012-02-02 04:17 | paul | Note Added: 0012745 | |
| 2012-02-02 04:17 | paul | Status | new => resolved |
| 2012-02-02 04:17 | paul | Resolution | open => fixed |
| 2012-02-02 04:17 | paul | Assigned To | => paul |
| 2020-04-19 20:15 | system | Note Added: 0022740 | |
| 2020-04-19 20:15 | system | Status | resolved => closed |
