Audio BPM extraction

[asterix]

I want to create a BPM extraction tool for VSXU. Has anyone had any particular success or better results from any particular formula?

We can extract a bass bpm from a 10 band eq or 2 band low/high.

[johnnylocust]

There's a somewhat usable example in the Bass_Fx extension to the Bass Audio Lib. You can basically set it up with a callback function that will be called at a fixed interval with the current BPM. It's not terribly accurate when doing it realtime, but it's pretty good when processing an entire audio stream.

[stex]

Hello,

The Bass.dll as johnnylocust said is very good and easy to implement.
I purchased a 1-Software Distribution License for 100 bucks and I'm very happy with it.

Stex

[asterix]

Ok so it acts like an FFT essentially. Nice- I guess thats what I've been looking for but alot of mulah for an open source project (I wonder if they have a concession
I probably want something reasonably accurate in realtime. Most of vsxu drives on opengl so theres a little more cpu to play with than a regular vj app.

[Motionreactor]

I'm looking at Bass and Bass_FX at the moment. It seems pretty accurate, granted it gets lost in areas and particularily heavy parts of electronic music though. However it seems like a good solution when coupled with some of your own program logic to interpret expected future beats and a manual override / tap to re-align things. This is what I plan to do in the near future.

[johnnylocust]

I wonder if they have a concession

They do. It doesn't even have to be open source, just free of charge.

[Motionreactor]

I just got BASS working under OsX in c++. It was medium / difficult for me (im very newbie programmer really) but it was not that hard... just a matter of piecing together from the documentation. Unfortunately I couldn't find a tutorial, but I'm starting to realise this library is self documenting because its functions are self explanatory.

[stex]

Originally Posted by Motionreactor

I just got BASS working under OsX in c++.

curiosity killed the cat: what are you implementing?
stex

[Motionreactor]

well, only tests and experiments at the moment... but eventually a much larger system.