#207 QObject message on session export: Cannot queue arguments of type 'QVector<int>'

[yubatake]

When exporting all busses of the attached qtz, the below message sometimes appears in Qtractor's Messages window:

QObject::connect: Cannot queue arguments of type 'QVector<int>' (Make sure 'QVector<int>' is registered using qRegisterMetaType().)

It usually appears during the first export after loading the session and will sometimes appear on subsequent exports (50% repro rate). When it appears, it will be at around 30% complete, 60% complete, or at both points. There doesn't appear to be anything wrong with the exported file, but I've never seen this message before so thought I'd let you know.

Some more info in case you need it:

• am running the latest git build, but has happened in the past week or so
• jack is on 256 frames/2 periods; also happened with 512 frames

In addition, rarely (less than 10% repro rate) there will be a "buzzing" noise right from the start of the exported file (before the pad comes in). This is also something I've never seen before. It happens even if the above message hasn't appeared so the two may not be related.

*With regard to the qtz, I've cut most things out to keep the file-size down (and as I'm still working on the track so don't want to release it yet). If Qtractor complains about IRs, samples etc. missing I don't think it should be a problem to replace with anything you have, but if you need anything specific please let me know and I'll aim to upload.

Please let me know if you can reproduce/have any ideas on this. Thanks.

[Rui Nuno Capela]

yes. the QObject messages are here reproduced as well;

also, the following have been observed:

• the messages seem to be innocuous, as of no serious or audible consequence, apparently;
• it only happens on Qt5 builds; Qt4 builds seem to be at least silent about showing that;
• the same messages only show when automation of any plugin's Activate subject is processed (play is on).

please confirm the Qt5 version you're linking for (Qt5.6.0 here), maybe it realtes to this only. anyway i'll try to narrow the issue to plugin Activate automation and see if it's worth of some mitigation.

cheers && thanks.

[yubatake]

Great - glad you've been able to reproduce. I'm on Qt 5.5.0 here.

[Rui Nuno Capela]

mitigated on git head master [17e7fd] aka. qtractor v0.7.7.13+

cheers

[yubatake]

Have tried various exports and haven't seen the message once, so it looks fixed/mitigated. Will post back if it appears again. Thanks.