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IDProjectCategoryView StatusDate SubmittedLast Update
0003672ardourbugspublic2011-01-05 21:062020-04-19 20:15
Reporterbarbarbaron Assigned Tocth103  
PrioritynormalSeveritymajorReproducibilityalways
Status closedResolutionfixed 
Target Version3.0-beta1 
Summary0003672: Inserting mono plugin to stereo track results in distorted sound and instability
DescriptionThis affects the 8447 SVN build of ardour3.0. The distortion comes from the outputs of the plugin inserted meaning that if blended to a low db level its not audible. The bug is present with any plugin type be it LADSPA or Lv2. VST not tested. One such experience ended with a crash.
TagsNo tags attached.

Activities

cth103

2011-01-06 01:17

administrator   ~0009849

Can you give an example of one plugin that causes the problem? Roughly what kind of audio file were you using? Does it happen when the track has no audio on it? What does the distortion sound like?

barbarbaron

2011-01-06 13:36

reporter   ~0009860

Pick for example any 1 channel reverb plugin, add the plugin as an insert to a stereo track and experience the distortion. It appears to be a peak level distortion in which peak levels exceed the limits and the signal becomes cornered.

steph5150

2011-02-27 02:13

reporter   ~0010190

Confirmed here with revision 8823, it wasn't a problem with ardour2 serie (2.8.11).

The frequency of those distorted/grainy artifacts seems to change as you change jack's latency.

By the way, how a mono plugin in a stereo track is handled? is there 2 plugin instances created and their parameters are just linked ? is it a double rate thing (one paquet for the left and another for right, whole thing in a single flux)? I must admit, I'm perplexed.

cth103

2011-02-27 18:07

administrator   ~0010196

Can you give me a precise example of a plugin that causes this problem? ie its name? steph5150: in this situation there are two plugin instances with their parameters linked.

steph5150

2011-02-27 22:49

reporter   ~0010199

For example, Barry's Satan Maximizer (even with knee point at 0dB and a source at approx -10dB which is low) inserted pre-fader in a stereo track produces those artifacts.

There's also:

eq10q (with any correction engaged and adding or cutting some frequencies)

4-band parametric filter (Mono) LV2 by Nedko Arnaudov (the stereo version works well)

Multiband EQ (steve harris)...and so on...just a few examples.

Not tested every plugin but, every plugin I tried which got 1 audio-in/1 audio-out produced artifacts with some exceptions : SC1, SC4 mono
Again not tested everything ;-)

cth103

2011-02-28 00:17

administrator   ~0010201

OK, thanks. I'm seeing this, but it's quite flighty. I can most reliably trigger it with Barry's Satan Maximiser, and it seems to not happen after a session re-load, only when the plugin has been added in the current session.

cth103

2011-02-28 02:33

administrator   ~0010203

This should be fixed in SVN 8982. Please re-open this bug if you are still having problems. Thanks!

steph5150

2011-02-28 10:49

reporter   ~0010209

Some more infos,

with eq10q (some correction engaged) after session reload only the left channel of the track is processed, right channel is not processed at all.

with 4-band parametric filter (Mono) LADSPA by Nedko Arnaudov both channel are processed but only the left channel is controlled, the right channel is still processed with the settings applied before saving and its parameters are not controlled by the gui.

cth103

2011-02-28 13:47

administrator   ~0010210

Steph5150: is this with latest SVN?

steph5150

2011-02-28 14:08

reporter   ~0010211

No, sorry I don't have the time right now to check with latest SVN.
My report only applies to 8823 (no problem with ardour2) and I don't know if it's still a bug in latest SVN.
Thanks

steph5150

2011-02-28 14:22

reporter   ~0010212

Quick test with pre-packaged SVN 8977 (amd64) from https://launchpad.net/~blablack/+archive/maverick-music shows the same symptoms.
Again, don't have much time to go through a whole rebuild process, but will do as soon as possible.

steph5150

2011-02-28 14:33

reporter   ~0010213

under a terminal 'ardour3 -v' gives :

Ardour 33.0pre0 (built using ['8976'] et GCC version 4.4.5)

hope it helps. Thanks.

cth103

2011-02-28 14:38

administrator   ~0010214

No, not new enough. See above:

"This should be fixed in SVN 8982. Please re-open this bug if you are still having problems. Thanks!"

If your SVN revision is lower than 8982 you are not seeing the fix.

steph5150

2011-03-03 11:53

reporter   ~0010265

With svn9015 there's no artifacts but:

with eq10q (some correction engaged) only the left channel of the track is processed, right channel is not processed at all.

with 4-band parametric filter (Mono) LADSPA by Nedko Arnaudov only the left channel is processed, the right channel is only processed after a session save/reload with the settings applied before saving and its parameters are not controlled by the gui.

Should I open a new issue ?

cth103

2011-03-04 23:15

administrator   ~0010281

The issue with the EQ10Q should be fixed in SVN 9076. Where did you get the 4-band LADSPA filter from?

steph5150

2011-03-05 09:21

reporter   ~0010285

Last edited: 2011-03-05 09:33

 This report is wrong, my fault

Installed 4-band parametric filter by Nedko via synaptics:
fil-plugins 0.3.0-1
Maintainer: Debian Multimedia Maintainers <pkg-multimedia-maintainers@lists.alioth.debian.org>

I must say it works very well under jack-rack.
Will test svn9076 and give feedback...

steph5150

2011-03-05 09:31

reporter   ~0010286

Oh so SORRY !!!

It's the LV2 one:
lv2fil 2.0-1
Maintainer: Debian Multimedia Maintainers <pkg-multimedia-maintainers@lists.alioth.debian.org>

And under lv2rack it gives only one output...so the test is not relevant.

Again, I apologize

steph5150

2011-03-06 02:28

reporter   ~0010295

Hi cth103,

I can confirm this is all fixed here in svn9082.

Many thanks to all the people involved.
Thanks cth103.

barbarbaron

2011-03-06 13:51

reporter   ~0010296

Works very well! Thanks cth103.

system

2020-04-19 20:15

developer   ~0022348

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.

Issue History

Date Modified Username Field Change
2011-01-05 21:06 barbarbaron New Issue
2011-01-06 00:11 cth103 cost => 0.00
2011-01-06 00:11 cth103 Target Version => 3.0-beta1
2011-01-06 01:17 cth103 Note Added: 0009849
2011-01-06 01:17 cth103 Status new => feedback
2011-01-06 13:36 barbarbaron Note Added: 0009860
2011-02-27 02:13 steph5150 Note Added: 0010190
2011-02-27 18:07 cth103 Note Added: 0010196
2011-02-27 22:49 steph5150 Note Added: 0010199
2011-02-28 00:17 cth103 Note Added: 0010201
2011-02-28 00:17 cth103 Status feedback => confirmed
2011-02-28 02:33 cth103 Note Added: 0010203
2011-02-28 02:33 cth103 Status confirmed => resolved
2011-02-28 02:33 cth103 Resolution open => fixed
2011-02-28 02:33 cth103 Assigned To => cth103
2011-02-28 10:49 steph5150 Note Added: 0010209
2011-02-28 13:47 cth103 Note Added: 0010210
2011-02-28 14:08 steph5150 Note Added: 0010211
2011-02-28 14:22 steph5150 Note Added: 0010212
2011-02-28 14:33 steph5150 Note Added: 0010213
2011-02-28 14:38 cth103 Note Added: 0010214
2011-03-03 11:53 steph5150 Note Added: 0010265
2011-03-04 23:15 cth103 Note Added: 0010281
2011-03-05 09:21 steph5150 Note Added: 0010285
2011-03-05 09:31 steph5150 Note Added: 0010286
2011-03-05 09:33 steph5150 Note Edited: 0010285
2011-03-06 02:28 steph5150 Note Added: 0010295
2011-03-06 13:51 barbarbaron Note Added: 0010296
2020-04-19 20:15 system Note Added: 0022348
2020-04-19 20:15 system Status resolved => closed