<html><body><div>OK, so at the link : <a href="https://uloz.to/%21yyVrCY2Y8sn1/devil-s-elbow-opus-7z">https://uloz.to/!yyVrCY2Y8sn1/devil-s-elbow-opus-7z</a>
(change the language to English by clicking at the flag at the right
upper side of the web page or just simply click at "Stáhnout pomalu" -
it may take some time as the file is 55 MB+ and the download service is
free) there is 7zip archive with 5 music files. The tune is "Nick Warren
- Devil's Elbow" and is freely available from the author's Soundcloud
account. I use this song for encoder testing because it requires quite a
high bitrate for artifacts to be inaudible (especially the "gas
leakage" kind of sound at the very beginning (repeated several times
during the full song lenght) of the track. The content of the 7z file is
the original track in WAV, 2 files encoded with libopus 1.1.5 at 32 and
48 kb/s (only with --bitrate 32 or --bitrate 48 option, other settings
on default) and 2 files encoded with libopus 1.2 RC1, again at 32 and 48
kb/s with default setting. For the 32 kb/s encoded files, there is
noticeable drop of stereo (or large part of frequencies) at the
beginning of the track roughly between 0:03 and 0:08 which is actually
audible for both libopus 1.1.5 and 1.2 RC1 (I haven't noticed it
before), but in the case of 1.2 RC1 it's much stronger and probably a
bit longer. I think this "effect" occurs several times again further in
the track but those occurences are always very short (in tenths of a
second). At 48 kb/s, this is not an issue (at least not very obvious)
for libopus 1.1.5 but still happens for libopus 1.2 RC1, although the
stereo/frequency drop is shorter than in the case of 32 kb/s. At 64 kb/s
(file not included in the 7z archive) I can't hear it for both 1.1.5
and 1.2 RC1. The other thing is that while the general sound quality of
32 kb/s encoded files is clearly higher for libopus 1.2 RC1 than for
1.1.5, at 48 kb/s the sound seems to be a bit clearer and closer to the
original when using 1.1.5 than 1.2. This could be my subjective feeling
as the difference is really tiny (unlike the bitrate, which is
noticeably higher for the same bitrate setting for libopus 1.2 RC1 for
every file).</div><div><br></div><div>Best regards,</div>Matěj</body></html>