Joan: New page: =Introducció= Arrel d'un mail a la LAU (maig 2010), hi ha la possibilitat de detectar el ritme i la pulsació en les cançons

 [LAU] Q: HOWTO: extract the beat times from an audio tr...

2011-02-01T09:03:44Z

New page: =Introducció= Arrel d'un mail a la LAU (maig 2010), hi ha la possibilitat de detectar el ritme i la pulsació en les cançons <pre> [LAU] Q: HOWTO: extract the beat times from an audio tr...

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=Introducció=
Arrel d'un mail a la LAU (maig 2010), hi ha la possibilitat de detectar el ritme i la pulsació en les cançons
<pre>
[LAU] Q: HOWTO: extract the beat times from an audio track
</pre>
<pre>
FreeCycle: Plastic surgery for your audio... :-)
http://freecycle.redsteamrecords.com/

Its a program that does all sorts of funky DSP analysis, and then spits out
.wav's for each "chunk" of beat.
Its even kind enough to also export a MIDI file that will play back that
same loop if you load the samples to
the right pads.. ;-)

There's sonanalyse,I don't have the URL ready. It's a commandline tool. I
can't really remember, if it acutally splits the song into regions.
</pre>
<pre>
You might be able to use something like Papagayo:

http://www.lostmarble.com/papagayo/index.shtml

It doesn't determine beats per se, but is a tool for creating synchs
for animation (usually dialog, but you could use it for this also).
-- Brett
</pre>
<pre>
you could try to import your audio into ardour and apply the rhythm ferret to it. It is supposed to do more or less what you're after
</pre>
<pre>
likely even more than one :)

Ardour has the "Rhythm Ferret" (Menu -> Window -> Rhythm Ferret) which
can split a track into pieces on Note or Percussive onset.

There's also an option to set the tempo-map (instead of splitting the
track) but I never go this to work.. AFAIK the RF is still work in progress.

To 'spit out' the times: I dunno if ardour can do that these days. But
you can always save the ardour session and extract the start-time of
each region with something alike this:

cat /path/to/session.ardour \
| grep "<Region " \
| grep "Audio 1" \
| sed 's/^.* start="$[0-9]*$".*$/\1/' \
| awk '//{print $0/44100.0;}' \
| awk '//{printf "%02i:%02i:%02i:%02i\n", \
$0/3600, ($0/60)%60, $0%60, ($0*25)%25;}'
> /tmp/beattimes.txt

Replace the 44100.0 with your sample-rate (48000?), 25 with your
video-fps. and "Audio 1" with the track-name.. In principle this could
be an awk one-liner; but the above is a bit more readable.. (-;

robin
</pre>
<pre>
Try aubiotrack (part of Aubio, http://aubio.org/), or use the simple
host included with the Vamp plugin SDK (see http://vamp-plugins.org)
together with a suitable analysis plugin
(http://vamp-plugins.org/download.html).

Note that Ardour's Rhythm Ferret also uses Vamp plugins internally,
and they can be used in Audacity too.

Chris
</pre>

(TBD), provar tot això
{{Autor}}, febrer 2011

Beat detection - Historial de revisió

Joan: New page: =Introducció= Arrel d'un mail a la LAU (maig 2010), hi ha la possibilitat de detectar el ritme i la pulsació en les cançons
[LAU] Q: HOWTO: extract the beat times from an audio tr...