[Freetantrum-devel] sp_example questions

[V.Lanard <vl...@ya...>]

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1. Which part of a song is the Songprint ID really based on?  
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I've been experimenting with sp_example to determine how small of an MP3
will successfully match an entry in the Songprint database.  What I've
found is that the first 30 seconds (or 400K) of a song seems to work
pretty consistently, but any other portion of the same song is not
recognized, regardless of length.  I don't know whether this is
something specific to sp_example or the underlying algorithm and I
haven't started looking at the code.  

This leads me to wonder whether 30 valid seconds of a song followed by a
cuckoo's egg would fool the database?  Also, for any clip of a song to
be recognized, that exact clip would have had to be entered into the
Songprint database by someone, right?  So seconds 10-40 of a song would
have a different key than seconds 0-30.  And judging by my testing of
sp_example, the entire song's key matches the key from seconds 0-30 but
not 10-40 or 0-10 or any other clip. This seems like it will lead to a
situation where any imperfect encoding of a song (ie. a song missing the
first few seconds) would cause the Songprint database not to recognize
the song unless someone had submitted a key from exactly that imperfect
version.

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2. Is there any easy way to capture the Songprint key locally from
sp_example?
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I'm trying to identify the Songprint ID generated by sp_example so that
I can use it to query Songprint separately from the key extraction
process. Is there an easy modification that I can do to sp_example to
allow me local access to the key?

Thanks!
V.Lanard