View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0006262||ardour||bugs||public||2015-04-19 18:34||2019-07-08 21:20|
|Platform||i7 3770K 3.5GHz,16GB Memory||OS||Kubuntu||OS Version||14.10 64bit|
|Product Version||4.X git (version in description)|
|Summary||0006262: Exporting a region via the output of its track creates a file with glitching audio.|
|Description||Exporting a region via the output of its track creates a file with glitching audio.|
|Steps To Reproduce||Right click the region and select the export option from its context menu. In the resulting export dialogue set the Source to be "Track Outputs". Now export.|
My experience has been that a plugin needs to be inserted for the issue to occur. There are reports however that a plugin is not required to trigger the problem.
|Additional Information||[19/04/2015 18:21:09] <oofus> I seem to be having issues exporting a region when the track it is on has plugins inserted|
[19/04/2015 18:22:06] <oofus> the resulting file has low frequency zipper type noise over the real audio
[19/04/2015 18:22:28] <rgareus> oofus: which plugin?
[19/04/2015 18:22:46] <rgareus> oofus: any gain automation on the track?
[19/04/2015 18:23:03] <oofus> rgareus: I've tried a selection, but currently testing with Tap EQ
[19/04/2015 18:23:11] <oofus> rgareus: no automation
[19/04/2015 18:24:07] <oofus> rgareus: I'm exporting from the regions context menu and choosing track output as the ports
[19/04/2015 18:24:17] <oofus> rgareus: ALSA backend
[19/04/2015 18:24:43] <oofus> rgareus: If I remove the plugin the resulting exported audio is clean
[19/04/2015 18:25:51] <oofus> rgareus: it's a stereo track
[19/04/2015 18:27:57] <rgareus> oofus: IIRC "export range" is not a "normal export" (not jack freewheeling, it's a bounce and hence backend independent)
[19/04/2015 18:28:15] <rgareus> oofus: I'll check using SWH's simple amp
[19/04/2015 19:04:39] <rgareus> oofus: I can reproduce it when choosing to export 'track output' of a region. and it also happens without plugin!
[19/04/2015 19:05:35] <rgareus> oofus: but IFF the output has more channels than the region itself (e.g export mono region -> stereo target)
[19/04/2015 19:06:01] <rgareus> oofus: additional channels have glitches
[19/04/2015 19:06:51] <rgareus> oofus: the glitch happens at period-size.
[19/04/2015 19:08:13] <oofus> rgareus: ok, well at least you can reproduce
[19/04/2015 19:08:27] <oofus> rgareus: for me it stops when the plugin is removed or disabled
[19/04/2015 19:08:41] <oofus> rgareus: and it's a stereo region exporting to a stereo file
[19/04/2015 19:08:58] <oofus> rgareus: so no mismatch in port count
[19/04/2015 19:10:50] <rgareus> oofus: I don't know yet. maybe the panner (and buffers)
[19/04/2015 19:11:09] <rgareus> oofus: looks like http://robin.linuxaudio.org/tmp/a4_export_region)out_glitch.png
[19/04/2015 19:12:15] <rgareus> oofus: that's with a -3dB Simple-Amp post fader, right click on region > Export .. Source: Track output
[19/04/2015 19:12:34] <rgareus> then re-import the region
[19/04/2015 19:13:08] <rgareus> oofus: looks like a sample-rate conversion gone wrong
[19/04/2015 19:13:17] <oofus> rgareus: ok, that looks like the sort of sound I'm hearing
[19/04/2015 19:14:03] <oofus> rgareus: it's 48K session, and I tried exporting to 48K and to 44K1, same issue in both cases
[19/04/2015 19:15:15] <rgareus> oofus: the effect (-3dB in this case) is only applied to the actual channel on export.
|Tags||No tags attached.|
||I just encountered this on Ardour 5.12.0, so confirming that this is still an open issue.This was experienced under the same conditions as already reported (not using jack). Glitches appear every n samples, where n is period size. Session export from master bus is not affected. Sorry if this has already been further discussed elsewhere.|