View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0004834 | ardour | bugs | public | 2012-04-09 21:53 | 2013-04-06 23:28 |
| Reporter | colinf | Assigned To | |||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | confirmed | Resolution | open | ||
| Target Version | 3.0 | ||||
| Summary | 0004834: Regions recorded via alsa_in have slightly different lengths to those recorded in the same pass from hardware inputs | ||||
| Description | I ran out of channels on my 8-channel sound card, so I was using a USB interface to get a couple extra via alsa_in. It works nicely enough, but regions recorded simultaneously from the main sound card and via alsa_in have slightly different lengths. The alsa_in regions seem to be 122 samples longer. This of course messes up edit group operations. | ||||
| Additional Information | I'm using jack 1, the last revision from the svn repository before it was moved to git, if that has any bearing on things. | ||||
| Tags | No tags attached. | ||||
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I haven't measured it properly yet, but it seems too as if the regions are slightly late (maybe by the same amount they're too long?). [EDIT] Actually, it seems to my ears that nudging them earlier by the capture offset brings them in time. I'll try to make some measurements when I'm not in the middle of a session... |
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A further observation: I originally spotted this with jackd running on a UA-1000 USB2 sound card, and alsa_in capturing from a Zoom H4. I've now seen the same behaviour on a different system, with jackd running on a Delta 1010 and Fons Adriaensen's zita-a2j capturing from a Delta 44, so I reckon it's definitely an ardour bug. |
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probably caused by latency reporting being different for each signal path. |
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to narrow it down: are the extra 122 samples happening regardless of the duration of the recording, or are there more samples the longer you have been recording? the latter might indicate that the resampling on alsa_in is not doing its job properly... but then it should go poof once the delta reaches the jack period size. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2012-04-09 21:53 | colinf | New Issue | |
| 2012-04-09 23:43 | cth103 | cost | => 0.00 |
| 2012-04-09 23:43 | cth103 | Target Version | => 3.0 beta4 |
| 2012-05-23 15:08 | cth103 | Target Version | 3.0 beta4 => 3.0 |
| 2012-06-26 00:56 | cth103 | Status | new => confirmed |
| 2012-07-07 12:20 | colinf | Note Added: 0013802 | |
| 2012-07-07 18:10 | colinf | Note Edited: 0013802 | |
| 2013-04-05 12:54 | colinf | Note Added: 0014812 | |
| 2013-04-06 14:06 | paul | Note Added: 0014831 | |
| 2013-04-06 23:28 | nettings | Note Added: 0014837 |
