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OGGRE is an ogg vorbis audio file compressor. In the vorbis format, the final entropy encoding of frames is very well done, so there is very little to pinch there. But with ogg headers and code blocks at the beginning of each ogg file, the situation is completely different, so they had to use deduplication. As a result, we got a win of only 5-7% from lzma.
To compress via FreeArc in arc.ini you need to add something like this:

[External compressor:oggre]
header = 0
packcmd = oggre_enc.exe {options} $$arcdatafile$$.tmp $$arcpackedfile$$.tmp

and use CLS-OGGRE.dll for unpacking.

I also made a version for wwise vorbis compression separately - they just removed all the ogg titles and code blocks. The OGGRE compressor for wwise was made quite on the knee, so to encode any file you must first convert it with the ww2ogg utility from .wav to .ogg and then press oggre_enc_wwise.exe. The unpacked instance through the oggre_dec_wwise will correspond to the .wav file, but without the WAVE header. In short, pure play.

P.S. If you don't understand how to use, or something isn't working - that's your problem, I've bolted on this project.

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