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Wavpack compression ratio with mono music on CD
post Oct 13 2005, 22:46
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Posts: 125
Joined: 17-November 04
From: Paris, France
Member No.: 18179

First of all, I'd like to thank Bryant for this wonderful codec. I switched to Wavpack for my whole collection (2000+ CDs) since the 4.0 release and I never looked back. cool.gif The compression/speed ratio is a killer, and the ApeV2 tags don't hurt either. tongue.gif

However, while running some general tests on lessless codecs, I stumbled on some results that may be of interest. I happen to listen to a lot of old mono popular music on CD (so technically it's stereo, but you see what I mean) and I was surprised to see Flac -8 frequently outperforming Wavpack -h, which to my small knowledge never happens with stereo music. Something weird, too: sometimes, Wv -f outperforms by a very slight margin wv default. Here are some numbers:

* On 5 out of 10 CDs tested, Flac -8 outperforms Wv -h (actually, Flac -5 does too)

* The biggest gap is happening with a recent Presley remaster where Wv -h does 32,52% while Flac -8 does 28,09%.

* On 2 out of these 10 CDs, Wv -f outperforms by a slight margin Wv default, and on 1 of these CDs even Wv -h! (-f = 42,01%, -n = 42,76%, -h= 43,30%).

I uploaded an Excel sheet on my site with detailed results. If you have any questions, please let me know. smile.gif
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post Oct 15 2005, 12:04
Post #2

Group: Members
Posts: 67
Joined: 6-September 05
Member No.: 24363

I love WavPack. If you have found a way to fix the mono compression error, please use it, even if it breaks older versions compatibility.

I disagree. I think if wavpack has an ambition to be mainstream format then first thing in mind is compatibility. MP3s are still so damn popular because they have best quality/smallest size?
Joe Average would only get pissed when a wv file he's got just won't play in his fav player. As a consequence he will try avoid "buggy/corrupt" wv files and'll stick to flac/ape for lossless.
In my opinion, sacrificing the 100% compatibility for wavpack to make a few percent size reduction in certain (rare) situations is a bad move.

This post has been edited by jetpower: Oct 15 2005, 12:05
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