This page is independently maintained. It is not operated by Horst Albrecht, his family, the LAME project, SourceForge, HydrogenAudio, or RareWares.
Overview
Horst Albrecht, known online as halb27, is publicly associated with
LAME MP3 encoder testing, VBR tuning discussion, and unofficial modified LAME builds circulated in audio
communities. His work is most often referenced in connection with experimental constrained-VBR behavior
and LAME 3.99.5-derived builds such as lame3995m and lame3995o.
The official LAME project remains separate from these community builds. Official LAME releases are source releases, while binaries and modified builds discussed here are historical or third-party community artifacts.
LAME background
LAME is a free and open-source MP3 encoder licensed under the GNU Lesser General Public License. The official LAME site describes it as a high-quality MPEG Audio Layer III encoder and lists LAME 3.100, released in October 2017, as the latest official release.
The SourceForge project area states that the official project provides source code only. Windows binaries, development builds, and patched variants are therefore normally distributed by third parties or by independent maintainers, and should be labelled accordingly.
halb27 and LAME
Public LAME history credits Horst Albrecht in the LAME 3.98 beta period for VBR tuning work. Public forum traces also show the halb27 account participating in HydrogenAudio discussions related to LAME and MP3 encoding. In technical context, these references are best described as community contribution, testing/tuning, and unofficial experimental build work, rather than official LAME project maintenance.
The former domain horst-albrecht.de is treated here as a historical pointer. The present page
does not attempt to recreate, impersonate, or speak for the former personal site.
Historical builds
The following table records public build names and option forms associated with halb27-related LAME discussion. Some entries are well documented by current public mirrors; others are retained as historical references pending stronger primary documentation.
| Build or reference | Base / period | Observed options or features | Public status | Notes |
|---|---|---|---|---|
lame3995o |
LAME 3.99.5-derived; RareWares package dated 2019-06-20 | --cvbr x, described publicly as accepting fractional values from 1 to 10 alongside standard -Vn |
Documented by RareWares | RareWares describes this as “halb27s modified lame 3.99.5” and notes a bug-fixed FastCRC patch. |
lame3995o-20190620.zip |
2019-06-20 | 32-bit Windows package | Listed by RareWares | Use RareWares as the preferred public binary reference rather than generic codec-download sites. |
lame3995o-x64-20190620.zip |
2019-06-20 | 64-bit Windows package | Listed by RareWares | Listed in the RareWares MP3 file index. |
lame3995m |
LAME 3.99.5-derived experimental line | Earlier constrained-VBR concept; public traces include --bCVBR-style references |
Historical reference | The exact option semantics should be documented from original posts, source, or executable help output before mirroring binaries. |
lame3100h |
LAME 3.100 experimental/community line | “Functional extension” line; references include -V0+ |
Historical reference | Public forum references exist, but live binaries should not be linked without provenance. |
lame3100i |
LAME 3.100 experimental/community line | Listening-test references include -V2+ |
Historical reference | Referenced in public codec listening-test material; not treated here as an official release. |
-Q forms |
Observed in public halb27 context | Examples include -Q1.7 |
Observed option naming | Option names and meanings changed across experimental builds. This page preserves observed forms rather than normalizing them. |
Constrained VBR lineage
In ordinary variable bitrate encoding, the encoder varies bitrate according to its quality model. The constrained-VBR concepts discussed here add controls intended to stop bitrate allocation from falling too low in cases where the maintainer believes additional bits may improve robustness or quality.
Public descriptions of halb27-related builds show more than one interface for this idea. The
lame3995m line is associated with an earlier constrained-VBR concept; lame3995o
is described by RareWares as exposing --cvbr x, where x is a 1–10 fractional
control used alongside standard -Vn. Other public contexts show -Q-style forms.
Because these were experimental community builds, this page treats the option names as historical observations attached to specific builds or public references, not as one stable official LAME interface.
Related current development
Independent constrained-VBR development is currently continued at lamemp3.co.uk. That site presents Windows LAME builds including cVBR and cVBRb variants, build notes, checksums, command-line examples, and beginner help.
The maintainer describes this work as partly inspired by halb27’s earlier constrained-VBR concept, especially
the lame3995m line, but technically divergent: stricter constrained-VBR behaviour was developed,
followed by implementation work such as SIMD and OpenMP enhancements. This current branch is independent
and should not be described as being authored, endorsed, or continued by Horst Albrecht.
Link policy
This page links to official project resources, long-standing audio-community references, and sources with clear provenance. It does not link to generic codec-download aggregation sites, installer wrappers, download-manager pages, advertising mirrors, or monetized redirects.
If historical binaries are ever mirrored directly, they should be accompanied by source context, license notes, build provenance, file hashes, and an explicit “unofficial historical build” label.
FAQ
Is this the official LAME project website?
No. This page is independently maintained. The official LAME project website is lame.sourceforge.io.
Are the builds listed here official LAME releases?
No. The builds listed here are historical or third-party community references unless explicitly identified by the official LAME project.
Does this site use adverts, cookies, or tracking?
No. This site is intended to have no adverts, no affiliate links, no monetized redirects, no cookies, and no data collection.
What is the relationship between this page and lamemp3.co.uk?
lamemp3.co.uk is an independent current development site for constrained-VBR LAME builds. Its work is related by technical lineage but is not authored, endorsed, or maintained by halb27.
References
- LAME official website. Official project description and release information.
- LAME official downloads page. Official release/download guidance.
- LAME files on SourceForge. Official source file hosting.
- LAME SourceForge project page. Project infrastructure and source-code-only context.
- LAME history/changelog. Historical release notes including VBR tuning credits.
- HydrogenAudio: “LAME 3.99 is out”. Public LAME discussion including halb27 context.
- RareWares LAME bundles. Public description of
lame3995o. - RareWares MP3 file index. Public file listing for
lame3995opackages. - lamemp3.co.uk. Independent current cVBR/cVBRb Windows builds and documentation.