Distorsion when moving rate slider + Rubberband

[Daniel Schürmann]

Rubberband seems to reset it's internal filter when changing the rate. This leads to a hear-able distortion.

You can hear it best using a 440 Hz Test file.

The alternative would be to use a second Rubberband and crossfade to the new one whenever the rate changes. Unfortunately we cannot effort the extra CPU for this. The solution must be implemented CPU friendly inside Rubberband

[Daniel Schürmann (daschuer)]

Tested with 1.8.1-7ubuntu2 on Ubuntu Bionic

[Daniel Schürmann (daschuer)]

It looks like something has changed upstream in a not yet released version:
https://hg.sr.ht/~breakfastquay/rubberband/rev/6c0f84bf30b336be7b5424fbf0d5f55a05cbdbdd
https://hg.sr.ht/~breakfastquay/rubberband/rev/74a8a12b8d3c6aab9df129a4b310941b95ffb3e1

[Daniel Schürmann (daschuer)]

https://todo.sr.ht/~breakfastquay/rubberband/6

[Daniel Schürmann (daschuer)]

The linked bug affects the speex resampler. We use libsamplerate.

https://github.com/breakfastquay/rubberband/issues/30

[Uwe Klotz (uklotzde-deactivatedaccount)]

Fedora used the default build settings which defaults to speex for resampling although libsamplerate would be available.

PR: https://src.fedoraproject.org/rpms/rubberband/pull-request/1

[Erich Eickmeyer (eeickmeyer)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1909938

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

-Additionally-

The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Debian/Bugs.

If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.

[Daniel Schürmann (daschuer)]

I have executed "apport-collect 1909938" and it ends with "No additional info collected"
Are you still missing info?

This is the upstream bug:
https://github.com/breakfastquay/rubberband/issues/30

[Daniel Schürmann (daschuer)]

And:
https://todo.sr.ht/~breakfastquay/rubberband/11

[Erich Eickmeyer (eeickmeyer)]

Those aren't the bug reports that "upstream" is referring to here. Please report this bug to Debian using the instructions previously provided (https://wiki.ubuntu.com/Debian/Bugs). The package originates from Debian, from which Ubuntu derives.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/10270