Small DSD/DFF compression test: WavPack vs xz 2019-02-21 13:13:30 I once downloaded a couple of DSD files from http://www.2l.no/hires/ - and I noticed that one was delivered as .zip, at a pretty decent compression ratio. In fact, WavPack didn't seem to improve *that* much over zip.So - out of curiosity, I'd add - I decided to put WavPack up against a quite heavy general-purpose compressor: 7-zip's xz. Non-rigorous testing on stereo music suggests that xz - even at "Ultra" compression level - is absolutely no match for e.g. default WavPack, but that turned out not to be the case here. Test corpus: two pieces of music, each downloaded as stereo DSD64 and surround DSD64. One chosen for being small and delivered as .zip, the other for being Bach (maybe I'll even listen to it), both for being available in both formats.Compression levels: Both compression levels chosen for WavPack. Encoded using 5.1.0-x64 CLI (with -m) and manually adding up the times taken. For xz using 7-zip 17.01 beta x64, compression is much slower, so I chose "fast" to get something that isn't totally off WavPack high - and, "ultra" just to squeeze as much as practically feasible. Times taken on my slow fanless media-playing Windows 7 desktop:.wv: 38s. .wv -h: 167s .xz fast: 275-ish .xz ultra: go have a shower and come back later.Not-very-scientific-summary:WavPack doesn't shine that much on this material-h improves - and even more for multichannelTwo previous bullet items suggest that compression could be improved if one wants to ...... which arguably might not be worth the effort unless the DSD bullshit gets widespread and e.g. takes over the market for surround-recorded music. Until then, a lossless format that works and does a decent job could very well be more than enough.Table over file sizes: From Windows' "Properties" of the files read off in MiB, smallest-file recording stereo & multichannel, then the other:Code: [Select]File: 2L-125_stereo-2822k-1b_04.dsf.dsf 66.4 .xz fast 36.3 ultra 32.9 .wv 33.2 .wv -h 29.3File: 2L-125_mch-2822k-1b_04.dsf.dsf 198 .xz fast 105 ultra 94.0 .wv 97.1 .wv -h 85.8File: 2L-139_stereo_DSF_2822k_1b_01.dsf .dsf 278 .xz fast 161 ultra 144 .wv 152; .wv -h 120File: 2L-139_mch_DSF_2822k_1b_01.dsf.dsf 837 .xz fast 474 ultra 421 .wv 441; .wv -h 360For the two files delivered as .zip (unknown compressor, unknown parameters), xz fast improves ~7 percent.