4 comments

  • tux3 0 minutes ago
    So, it looks like this tries to build a model (or rather, multiple layers of models combined with something called context mixing[0]), potentially analyzing the whole file first? Is it fair to call this a very fancy entropy coder, replacing the last phase of what a traditional audio codec does (the lossless part, after quantization)?

    I like the code style, this is pretty nice C. It's refreshing to see human code.

    [0]: https://en.wikipedia.org/wiki/Context_mixing

  • merbanan 5 minutes ago
    Vorbis sends the entropy tables in the actual file at the start.

    https://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-470003

    If you have the complete file you can calculate the optimal ones. In a streaming scenario that does not work and you have use something you think is good.

  • EdSchouten 15 minutes ago
    Interesting that it doesn’t use the same open source license as Vorbis/Opus itself. Otherwise improvements like these could be upstreamed?
  • BoingBoomTschak 3 minutes ago
    Those .blr extensions in the examples are making me doubt: the result is still conformant and playable ogg Vorbis/Opus, right?