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Topic: Opus 1.2 alpha (Read 8332 times) previous topic - next topic

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  • Gyulank
  • [*]
Re: Opus 1.2 alpha
Reply #25
About half year ago I tried to compare mp3 and opus formats. I think that the 64kbps opus = with the 320kbps mp3.
I didn't hear different in stereo separate, or quality when I used bigger framerate. But I don't know what version was it, because I maked those files with Goldwave. My full result was:
320 mp3 64 opus   stereo
---------------
256 mp3 48 opus   less stereo
160 mp3 32 opus   even less stereo
---------------
96  mp3  24 opus   it's been almost mono
48-64 mp3  16 opus
32  mp3 12 opus
My question that my result is correct, and concern to all version? (The best is 64 VBR?) And that the quality change when I using VBR, CVBR, CBR, or just the filesize?

  • NetRanger
  • [*][*][*]
Re: Opus 1.2 alpha
Reply #26
Opus-tools v0.1.10 (using libopus 1.2-alpha2-3-g68afa490)
h**ps://git.xiph.org/?p=opus.git;a=summary
h**ps://git.xiph.org/?p=opus-tools.git;a=summary

  • darkbyte
  • [*][*][*]
Re: Opus 1.2 alpha
Reply #27
Is there anyone building the libopus.dll variant of this? I would like to try this with foo_streamer.
WavPack -b4x4hc
Opus --cvbr --bitrate 256 --framesize 5

  • NetRanger
  • [*][*][*]
Re: Opus 1.2 alpha
Reply #28
Opus-tools v0.1.10 (using libopus 1.2-alpha2-4-gcfdaf365)
h**ps://git.xiph.org/?p=opus.git;a=summary
h**ps://git.xiph.org/?p=opus-tools.git;a=summary

  • NetRanger
  • [*][*][*]
Re: Opus 1.2 alpha
Reply #29
Opus-tools v0.1.10 (using libopus 1.2-alpha2-15-g3c9b4d61)
h**ps://git.xiph.org/?p=opus.git;a=summary
h**ps://git.xiph.org/?p=opus-tools.git;a=summary

  • Seymour
  • [*]
Re: Opus 1.2 alpha
Reply #30
Hi!
I was spectating here as a guest for a while. =)
And also have downloaded some binaries from here (love this place because it lets guests to download attachments).
Just now listened to some (trance) music encoded from lossless with Opus different versions, VBR 32kbps.

libopus 1.2-alpha2-15 improvement compared to libopus 1.1.3
Result: Great! Stereo is retained much, much better this time! Of course, this tuning has changed overall quality perception. Artifacts are more perceptible now. High frequency instruments spectrum suffer more. It's time to notice that 32kbps is very low bitrate. ;-)
From my experience, stereo coding is the primary weak spot of current release version (libopus 1.1.3). At higher bitrates (my choice is 96kbps) too. I hope you will update the release soon! I see the great potential in the Opus audio codec, and in you, developers!
And I hope this improvement has effect not only on 32kbps bitrate. ;-)  (have not checked yet)

  • NetRanger
  • [*][*][*]
Re: Opus 1.2 alpha
Reply #31
Opus-tools v0.1.10-1-gd0dc36b (using libopus_1.2-alpha2-25-g8056706f)
h**ps://git.xiph.org/?p=opus.git;a=summary
h**ps://git.xiph.org/?p=opus-tools.git;a=summary

  • NetRanger
  • [*][*][*]
Re: Opus 1.2 alpha
Reply #32
Opus-tools v0.1.10-1-gd0dc36b (using libopus 1.2-alpha2-29-gc293dede)
h**ps://git.xiph.org/?p=opus.git;a=summary
h**ps://git.xiph.org/?p=opus-tools.git;a=summary

  • soundping
  • [*][*]
Re: Opus 1.2 alpha
Reply #33
Thanks, NR
Don't believe common sense.
Everything is fake.
Go back to sleep.

  • darkbyte
  • [*][*][*]
Re: Opus 1.2 alpha
Reply #34
I'm testing 1.2 Alpha @ 44kbps (ABR) for music streaming (with a dense multiband compressor preset, CHR radio like sound) and have to say, quiet surprised by the results. On speakers for background listening it's not bad at all. I can notice some roughness >10kHz, and the alternation of stereo image, but comparing it to 64kbps HE-AAC i still prefer these artifacts to SBR's. Previous versions of Opus produced some kind of metallic warbling in this bitrate range on the kind of electronic music I'm listening to.

Good job guys! :) I wonder if there's still any room for improvement.
  • Last Edit: 17 March, 2017, 06:36:51 AM by darkbyte
WavPack -b4x4hc
Opus --cvbr --bitrate 256 --framesize 5

  • ziemek.z
  • [*]
Re: Opus 1.2 alpha
Reply #35
Good job guys! :) I wonder if there's still any room for improvement.
Of course :) Have you tried encoding speech at 12-20 kbps? Fullband speech starts from 14 kbps!
Encode something @16kbps with Opus 1.1, then... just let Opus 1.2 alpha blow you away (at the same bitrate).
sox -e float -b 32 -V4 -D gain -1 rate -v 48000 norm -1
opusenc --bitrate 128