Warble in LF with sample at 192kbps about opus HOT 6 CLOSED

I can ABX it very readily at 64kbps. It's less obvious in the 192kbps version but still present.

I just turned off my speakers and listened to only the sub. The effect kicks in right at the beginning, the first 3 seconds are enough. Rather than the bass being smooth and continuous, it sounds like it stutters and has “wind” on top of it.. hard to describe

from opus.

I think this is due to the 180 degree stereo. I'm surprised it's being used at 192kbps. The sub mixes the channels together and causes cancellation.

from opus.

IS isn't used on the LF bands (and especially not at 192kbps) so disregard my previous comment.

from opus.

Seems to be due to extreme energy in LF and the leakage it causes in the next few bands.

from opus.

The issue should be fixed in master at: https://git.xiph.org/?p=opus.git;a=commitdiff;h=0cc4d9659aaa3
Feedback welcome.

from opus.

I'm assuming it's working. Feel free to reopen if it's still a problem.

from opus.