Hello, I've just found that this sample, when encoded with bitrate lower than about 48 kbps, has got some strange artifacts. According to that article → https://people.xiph.org/~jm/opus/opus-1.2, I should tell you about it… It sounds like Opus plays high frequencies up and it combines with that echo effect. Best regards -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.xiph.org/pipermail/opus/attachments/20170817/a170f478/attachment-0001.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: sample.tar Type: application/x-tar Size: 182784 bytes Desc: not available URL: <http://lists.xiph.org/pipermail/opus/attachments/20170817/a170f478/attachment-0001.tar>