Extract Chords From YouTube Videos • Hacker News Board

Re: Extract Chords From YouTube Videos

#11

Post by hubtree » Wed, Mar 19, 2014, 5:07 PM UTC

I've found the results to be hit and miss, but I find for me it is a good starting off point to figuring a song out.

Re: Extract Chords From YouTube Videos

#12

Post by Angostura » Wed, Mar 19, 2014, 5:17 PM UTC

apalmer wrote: post #10

tried to use this and the results were completely off... BUT i was trying to use it on Moonlight In Vermont by the Johnny Smith Quintet. I am expecting that the type of harmonic structure used in the jazz chord melody style is probably beyond the current capabilities of this technology. Even still though, i mean the results seemed to have no relation at all to teh music being played, chords were shown on silent parts…

Agreed, it' say really cool idea, so I thought I would try it out with something relatively simple - Adele's Skyfall.

The results seem hit and miss - consecutive lines with the same chord structure appear to me transcribed differently

http://chordify.net/chords/adele-skyfall-lyric-video-adeleve...

Re: Extract Chords From YouTube Videos

#13

Post by dimmuborgir » Wed, Mar 19, 2014, 5:34 PM UTC

markovbling wrote: post #2

This is so cool! Makes me wonder what the next step would be. Seems like they're essentially decomposing a song into its ingredients. I wonder if they could use their algorithm to convert a song from one genre to another like auto-creating the hiphop or dance version of a given song :)

Microsoft Songsmith does that. There are some crazy videos on Youtube. Eg: http://www.youtube.com/watch?v=mg0l7f25bhU

Re: Extract Chords From YouTube Videos

#14

Post by chillingeffect » Wed, Mar 19, 2014, 5:46 PM UTC

apalmer wrote: post #10

tried to use this and the results were completely off... BUT i was trying to use it on Moonlight In Vermont by the Johnny Smith Quintet. I am expecting that the type of harmonic structure used in the jazz chord melody style is probably beyond the current capabilities of this technology. Even still though, i mean the results seemed to have no relation at all to teh music being played, chords were shown on silent parts…

fwiw, this uses software [1] that has dozens of dials to adjust yet not giving access to those dials. That's probably why. One of the key challenges (i've tried to write chord detectors personally) is that different instruments sounds have different harmonic falloff rates (in different frequency ranges no less).

[1] http://isophonics.net/nnls-chroma

Re: Extract Chords From YouTube Videos

#15

Post by JonnieCache » Wed, Mar 19, 2014, 5:56 PM UTC

Harmonic extraction algorithms are cool. Make a recording of yourself standing in a stairwell hitting a wok with a spoon, push that through the algo, and you get avant-garde jazz out the other end. Sometimes. It's certainly easier than spending 30 years learning to play the keyboard.

I guess with it hooked to youtube we can rapidly try out all sorts of unusual inputs.

Re: Extract Chords From YouTube Videos

#16

Post by tech-no-logical » Wed, Mar 19, 2014, 5:57 PM UTC

   this youtube video is not available in your location
   this deezer song is not available in your country
   this youtube video contains content from [x]. it is restricted from playback on certain sites.

on the first three clicks. oh well...

Re: Extract Chords From YouTube Videos

#17

Post by cannam » Wed, Mar 19, 2014, 6:06 PM UTC

You might also like the Yanno chord extractor, with super-academic-looking but quite easy to use UI here: http://yanno.eecs.qmul.ac.uk

If I remember aright, both Chordify and Yanno use NNLS Chroma for the feature extractor but they use different methods to segment and label the chords. (Yanno uses Chordino which you can find at http://isophonics.net/nnls-chroma with the NNLS Chroma plugin.)

Re: Extract Chords From YouTube Videos

#18

Post by cannam » Wed, Mar 19, 2014, 6:07 PM UTC

ralmeida wrote: post #5

notastartup wrote: post #4

This is great, wondering if there's an open source version of something like this.

Take a look at http://isophonics.net/nnls-chroma

Which you can run in, for example, http://sonicvisualiser.org/

Re: Extract Chords From YouTube Videos

#19

Post by emersonrsantos » Wed, Mar 19, 2014, 6:09 PM UTC

Actual scientific relevant dissertation:

http://dspace.library.uu.nl/bitstream/handle/1874/226713/haa... [pdf]

Re: Extract Chords From YouTube Videos

#20

Post by emersonrsantos » Wed, Mar 19, 2014, 6:20 PM UTC

JonnieCache wrote: post #15

Harmonic extraction algorithms are cool . Make a recording of yourself standing in a stairwell hitting a wok with a spoon, push that through the algo, and you get avant-garde jazz out the other end. Sometimes. It's certainly easier than spending 30 years learning to play the keyboard. I guess with it hooked to youtube we can rapidly try out all sorts of unusual inputs.

Many musicians consider themselves 'composers' because they know harmony. Harmony is 'composition for dummies'. To compose real stuff you have to study counterpoint for lifetime.

And there are even worse algorithmic composing systems like Lyle Murphy's Equal Interval System, Schillinger, etc... I love algorithms but that's not art.