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Anyone ABXed -q8?
Rfi
post Sep 26 2007, 22:24
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I did some searching and couldn't quite find any test results as to q8 on OGG Vorbis AuTov b5. Apologies if anyone already asked this, but I looked for quite awhile and couldn't find anything.

I am considering converting my lossless backups to OGG Vorbis after burning them to DVDR (I keep local copies on my HDD for easy use)... but I want to eliminate the possibility of artifacts. I will be playing these exclusively from the PC and not DAPs, so compatibility is not an issue for me.

My question is, has anyone been able to ABX ANYTHING at q8 including the killer samples with the auToV b5 encoder? I am quite content with the filesize of Q8, so I don't feel the need to go any lower than that.

Thank you.
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Bourne
post Sep 26 2007, 22:28
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Gurubolez certainly could ABX at this level. If he reads this, you will know.
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guruboolez
post Sep 26 2007, 23:13
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No, I can't (not with 'usual' music at least).

This post has been edited by guruboolez: Sep 26 2007, 23:14
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HydroFred
post Sep 26 2007, 23:52
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If you want to save some space, have you considered switching to WavPack lossy?
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Bourne
post Sep 27 2007, 04:02
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since you're going q8 with OGG... you might consider going lossless all the way...
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Rfi
post Sep 27 2007, 04:20
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@Hydro: I don't really have too much confidence in that format for lossy just yet, it's too new.

@Bourne: Well, I get average 800-1000kbit with most of my music with lossless (I've tried FLAC, APE, Wavpack thus far). With Vorbis Q8 I'm cutting the space down to about 1/4 at best, and at worst for the most compressed lossless files I have, a little over half.
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Bourne
post Sep 27 2007, 04:47
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but I'm sure there will be a KILLER sample out there... :-)
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shadowking
post Sep 27 2007, 06:36
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I think only a hybrid encoder can be used to safely lower the data rate while always remaining transparent - for listening , multiple-editing, transcoding etc. Lossywav will be the solution. I think current wavpack @ 500..550k will save a lot compared to typical 800..1000k rates.

With vorbis I noticed bad transcoding artifacts when going from high bitrate to lower bitrate OGG.

For 250k I'd stick with mp3.

This post has been edited by shadowking: Sep 27 2007, 06:39


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Wavpack -b450s0.7
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MedO
post Sep 27 2007, 10:22
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It wasn't AoTuV b5, but I ABXed Vorbis at -q8 once (with extreme difficulty) on this problem sample:
The Product
I could try it with b5 when I get home from work.

Edit: I've also just seen this thread which is probably of interest to you.

This post has been edited by MedO: Sep 27 2007, 10:35
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Saurvan
post Aug 18 2010, 12:06
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I ABXed Vorbis at -q8 on this sample:http://narod.ru/disk/23837136000/Fighter%20Beat.wav.html
(AoTuv beta 5.7)

This post has been edited by Saurvan: Aug 18 2010, 12:08
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shadowking
post Aug 18 2010, 13:42
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Wow good sample. A bit like Berlin drug. Its actually very common in EBM / synthpop / industrial - Entire tracks can sound like this. This can be a problem even for aac / vorbis & impossible with mp3 .


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Wavpack -b450s0.7
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Saurvan
post Aug 20 2010, 17:56
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This is a sample from Prodigy CD "Invaders must die" (bonus-track from Japanese edition of this album).
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dsimcha
post Aug 21 2010, 03:24
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I've ABX'd -q7 on AoTuV 5.7 Beta on one killer sample at the end of the "Money for Nothing" remix of "Telegraph Road" by The Dire Straits. Never -q8, though.
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Steve Forte Rio
post Sep 3 2010, 21:49
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I can ABX Vorbis (both AoTuV and libvorbis) up to 8 (incl.), but I can't do it for -q9 with any samples...

If someone interested here is my test samples:

tiesto-do_you_feel_me - first seconds and 16-20 ss

fighter_beat - almost all sample

I can prove it with ABX logs, but only tomorrow

This post has been edited by Steve Forte Rio: Sep 3 2010, 21:50
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