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RJ
playdar-core
PHP2009–2016
RJ / playdar-core

playdar-core

Playdar - a content resolver for music

Creative & Media
Explore on GitHubRead Hacker News discussions
4Distinct people
5Mentions
0Explicit recommenders
192GitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

Playdar - a content resolver for music

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year5 dated mentions

Observed mentions: 2009-10-09 21:29:42 UTC to 2016-05-10 07:51:06 UTC.

0122009-01-01 00:00:00 UTC to 2010-01-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments20092010-01-01 00:00:00 UTC to 2011-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2011-01-01 00:00:00 UTC to 2012-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2012-01-01 00:00:00 UTC to 2013-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments20122013-01-01 00:00:00 UTC to 2014-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2014-01-01 00:00:00 UTC to 2015-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2015-01-01 00:00:00 UTC to 2016-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2016-01-01 00:00:00 UTC to 2017-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2016

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20092009-01-01 00:00:00 UTC2010-01-01 00:00:00 UTC110
20102010-01-01 00:00:00 UTC2011-01-01 00:00:00 UTC202
20112011-01-01 00:00:00 UTC2012-01-01 00:00:00 UTC000
20122012-01-01 00:00:00 UTC2013-01-01 00:00:00 UTC101
20132013-01-01 00:00:00 UTC2014-01-01 00:00:00 UTC000
20142014-01-01 00:00:00 UTC2015-01-01 00:00:00 UTC000
20152015-01-01 00:00:00 UTC2016-01-01 00:00:00 UTC000
20162016-01-01 00:00:00 UTC2017-01-01 00:00:00 UTC101

What Hacker News says

5 sources
albertzeyer·May 10, 2016
I am quite interested in this topic. There is some research on that field. Some links I collected in the past: http://thesis.flyingpudding.com/ http://dynampd.ubitux.fr/ http://erikbern.com/2015/09/22/presentations-about-spotify-m... http://erikbern.com/2015/09/24/nearest-neighbor-methods-vect... http://www.wired.com/underwire/2013/08/qq_netflix-algorithm/ http://www.slideshare.net/erikbern/collaborative-filtering-a... http://benanne.github.io/2014/08/05/spotify-cnns.html https://news.ycombinator.com/item?id=8137264 http://www.playdar.org/ https://github.com/RJ/playdar-core http://news.ycombinator.com/item?id=3876724 https://github.com/bmcfee/librosa http://forever.fm/ http://blog.petersobot.com/introducing-forever-fm http://musicmachinery.com/2011/05/14/how-good-is-googles-ins... http://musicmachinery.com/2012/11/12/the-infinite-jukebox/
Read the rest
Btw., as I am developing my own music player, my main important feature/goal is a kind of automatic DJ which automatically selects music and I also especially had a discover mode in mind. However, that main feature did not evolve that much so far because there were so much other things to implement first. For now, it only supports access to files in your file system, and it looks on tags and artist and adds quite some randomness to it. https://github.com/albertz/music-player/blob/master/WhatIsAM...
In Finding Similar Music Using Matrix Factorization
albertzeyer·Apr 23, 2012
Some more info: This is from Last.fm developers, esp. RJ (Richard Jones), mxcl (Max Howell; the guy behind Homebrew) and others. The current source is written in Erlang. https://github.com/RJ/playdar-core There is some old abandoned source written in C++: https://github.com/RJ/playdar I found this while searching for the Boffin source code. Something about Boffin: * http://blog.last.fm/2009/03/11/introducing-boffin-lastfms-mu... * http://www.last.fm/group/Audioscrobbler+Beta/forum/30705/_/5... And in the abandoned C++ repo, there is something about Boffin (haven't really looked much into it yet): https://github.com/RJ/playdar/tree/master/resolvers/boffin
In Playdar - music content resolver service

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