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Show HN: YouTube Guitar Tab Parser(github.com)
38 points by neogenix 2 hours ago | 25 comments

I created a simple CLI that turns a YouTube guitar-lesson video into a PDF of the guitar tab.

There are services that transcribe music from Youtube videos into tabs, but they never work well enough for me. Instead I'm taking a simpler approach. It downloads the video, samples frames, uses Claude vision to locate the tab region, crops every frame to that region, de-duplicates the crops by the bar number printed on each line of the score, and stitches the distinct tab lines vertically into a PDF.

I didn't test it on a lot of different Youtube videos yet, so problem will arise for sure.

adrianh 2 hours ago | parent | next [-]

I'm curious how it works for videos that contain moving tab (as in, the playhead stays in the center while the tab moves behind it). Seems like that sort of tab wouldn't work with this approach...?

Kudos from one of the Soundslice guys — we've been making web-based tab and sheet music stuff since 2012. :)

mschulkind 31 minutes ago | parent | next [-]

I don't have an answer, but wanted to say that I started using Soundslice about 9 months ago and I absolutely love it. It does exactly the part of transcribing that I want done for me and nothing more, which is basically none of it except the boring stuff.

adrianh 20 minutes ago | parent | next [-]

Hey, great to hear! Thanks for taking the time to write that. :) Keep transcribing and playing music!

devin 16 minutes ago | parent | prev [-]

Care to sell me on it? How dose it compare to musescore?

neogenix 2 hours ago | parent | prev [-]

It wouldn't work for that type of video. As far as I've seen almost all tutorial videos on Youtube have a fixed tab bar though. I'm using it only for learning guitar (i'm a beginner).

XCSme 33 minutes ago | parent | prev | next [-]

I was excited to use it, as I really wanted something like this, then I realized it needs AI/Claude (?)

That sounds like it can get quite costly. Probably there are ways to do it without AI, I would rather manually annotate the tab area with a visual editor.

worldsavior 2 hours ago | parent | prev | next [-]

I don't know how exactly Claude vision works but isn't just using good old computer vision much cheaper?

neogenix 2 hours ago | parent [-]

Yes, for sure. You could probably train a specific vision model for this style of image parsing and run it on device for free. However, this was much easer to make :-)

cwt137 31 minutes ago | parent | prev | next [-]

It would be nice to have a link to an example YT video to see what exactly the AI is trying to locate on the screen.

dieselgate an hour ago | parent | prev | next [-]

Are there technical hurdles around just programmatically generating a tab from any song or audio recording itself?

This is interesting and all but seems to use computer vision rather than audio processing?

simonok 9 minutes ago | parent [-]

Using computer vision to read the existing tab from the page would be more efficient and precise than trying to use audio processing to isolate individual notes from a single instrument in a potentially busy audio track. The existing tabs also nail down which string and fret is used for each note, which would be a difficult task for audio processing because there are multiple combinations of string and fret for any given note. For example, an open G can also be played on the 5th fret of the D string, or the 10th fret of the A string, or the 15th fret of the E string.

rc5150 an hour ago | parent | prev | next [-]

Give me a tool that scrapes tabs from Ultimate-Guitar and I'll be a happy camper :)

smalltorch 6 minutes ago | parent [-]

This is one i could get behind. I mean, all the tabs are crowdsourced anyway so why can you throw up the paywall only after all the tabs are made.

I only need the clean tab and transposing would be nice.

TerminalTabs anyone?

Diogenesian an hour ago | parent | prev | next [-]

Almost all those people charge for the PDFs. They know the PDF is more useful, that's why the video is free.

I don't think your software is (or should be) illegal. But it's a form of theft, and incredibly unethical. These people worked very hard on these tabs and don't make much money. You (and kiaansaraiya and neogenix) should be ashamed of yourselves. You don't deserve your guitar if you steal tabs from working musicians.

breaker-kind an hour ago | parent | next [-]

counterargument -- these people are making money off of transcribing other people's parts, with no profits shared with the composers.

Diogenesian an hour ago | parent [-]

That's a bad counterargument. Transcribing is transformative. Copying a video into a PDF is not.

almostjazz an hour ago | parent | next [-]

I'm not a lawyer but based on some googling it seems like the overwhelming consensus is that selling transcribed sheet music or tabs if you do not have permission from the copyright holder of the song is illegal.

https://www.thatgreatcomposer.com/blog/is-it-legal-to-transc...

https://law.stackexchange.com/questions/96352/dual-question-...

https://www.drumforum.org/threads/what-is-the-legal-basis-fo...

akramachamarei an hour ago | parent | prev [-]

As an occasional amateur music transcriber I'd say the goal of transcription is not transformation. If I'm transforming, I've failed :)

Inevitably the transcriber makes decisions in how to deviate from the reference recording, be it omission of instruments, microchanges in tempo and pitch or articulation. In theory a good transcription is an exact graphical representation of the abstract sonic intent of the artist.

Of course, if you are combining voices, changing chords, it approaches an arrangement which is a more creative endeavor.

rc5150 an hour ago | parent | prev [-]

"you don't deserve your guitar if you steal tabs from working musicians"

the same "working" musicians who didn't write the music they're making tabs for, didn't get any permission from the original artists, and in many cases aren't actually playing/tabbing the parts as originally written.

A "working" musician is someone who doesn't monetize someone else's work, regardless of how super hard it must be to write a PDF.

I'd say someone should take your guitar away but I'd bet money you're not doing anything groundbreaking with it anyway.

earthnail 38 minutes ago | parent [-]

But then the solution is to just ignore these musicians.

But if you do find that they made something valuable that you can’t find elsewhere, then you should compensate them for that. Because yes, it is a lot of work.

kiaansaraiya 2 hours ago | parent | prev [-]

i've actually been looking for something like this for so long. all the online transcribers make me pay and i just wanna learn how play songs from a video. this is a great idea!

neogenix 2 hours ago | parent | next [-]

I had exactly the same issue. I'm learning to play guitar and don't want to pay 8,50 per tab. I simply want to learn something new and discard it. I noticed I'm learning faster if it's printed then on-screen.

rc5150 an hour ago | parent | prev [-]

learn by ear! It's free and you don't need youtube!

RyanOD 30 minutes ago | parent | next [-]

This is absolutely true...but it takes a LOT of time. Fortunately, I first picked up a guitar when I was 13.

I can't imagine getting started with any instrument as an adult. Actually, I'm trying to improve my piano playing right now and it's nearly impossible.

sublinear 43 minutes ago | parent | prev [-]

This is very true. Tabs can help in niche cases where the precision really matters, but most tabs are not that good unless written by the original artist (rare).

If I had spent my first year learning the instrument properly, I wouldn't have wasted the next decade after that fumbling around so much.