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Yes, it's quite possible for someone to develop their own vorbis encoder. due to the liberal licencing of the vorbis libraries, this encoder doesn't even have to be open source (and indeed, Xiph were trying to generate money for a while from Tremor, which is a vorbis encoder which only uses integer arithmetic). Garf, on this board, has also developed some tunings of his own -- most recently the 'floppy quality' 4kbit/s modes.
Has he finally released it? Thatīs not the only special Vorbis encoder, there is also Vorbis gt1 and Vorbis gt2. There are still many people claiming that gt2 sounds better than Vorbis 1.0 at higher bitrates (160kBit/s ore more), also itīs based on Vorbis RC2. I couldnīt hear a difference.
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I hope that ball will NEVER start rolling with Vorbis. You'd get Vorbis encoders that sacrifice quality for speed, the Vorbis version of Xing (Xorbis ), or evil shareware encoders that promise you enhanced quality, etc. Because of the BSD license, all that is possible.
I completly agree, I think itīs also good that there are not so many switches allowing you to destroy quality like with lame (-k).
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I have seen many encoders for MP3 , AAC, Vqf .
If I remember correctly there is also yust one vqf-encoder, but I could be wrong, I never used vqf. AAC is actually the worst of all: different encoders creating files which are all called MPEG 4 AAC or MPEG 2 AAC and all producing output which is incompatible to other encoders output (ADIF or ADTS header, Astrid/Quartex AAC....).