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morituri and Hidden Track One Audio

Filed under: morituri,Music,Python — Thomas @ 9:08 pm

2013-5-10
9:08 pm

I have tomorrow (saturday) blocked out for a whole day of morituri hacking as I will be home alone.

One of the things a lot of morituri users are puzzled by is its relentless drive to extract every single sample of audio from the CD. Currently, even if it’s a really short pre-gap, and most likely just an inaccurate master or burn, with no useful audio in it.

For me, that was a design goal of morituri – I want to be able to exactly reproduce a CD as is. That is to say, ripping a CD should extract *all* audio from the CD, and it should be possible to make a copy of that CD and then rip that copy, and end up with exactly the same result as from the original CD. (I’m sure there’s a fancy scientific term for that that I can’t remember right now)

To a lot of other people, it seems to be annoying and they don’t like having those small almost empty files lying around.

So I thought I’d do something about that, and that it might be useful as well to analyze my current collection of tracks and figure out what’s in there. Maybe I can find some hidden gems that I hadn’t noticed before?

So I added a quick task to morituri that calculates the maximum sample value (I didn’t want to use my own level element in GStreamer for this as I wanted to make sure it was actual digital zero; this should be done in an element instead though, but I preferred the five minute hack for this one).

And then I ran:

rip debug maxsample /mnt/nas/media/audio/rip/morituri/own/album/*/00*flac

Sadly, that turned up 0 as the biggest sample for all these tracks!

Wait, what? I spent all that time on getting those secret tracks ripped just to get none? That’s not possible! I know some of those tracks!

Maybe the algorithm is wrong. Nope, it works fine on all the regular tracks.

Oh, crap. Maybe morituri has been ripping silence all this time because my CD drive can’t get that data off. Yikes, that would be a bit of egg on my face.

No, it works if I check that Bloc Party track I know about.

Ten minutes of staring at the screen to realize that, while I was outputting names from a variable from the for loop over my arguments, the track I was actually passing to the task was always the first one. Duh. Problem solved.

As for what I found in my collection:

  • a cute radio jingle that brought back memories from a live bootleg I had made myself of Bloem. That’s from over ten years ago, but that must have been around the time I learned about the existence of HTOA and wanted to get one in
  • found unknown HTOA tracks on Art Brut’s Bang Bang Rock & Roll, Mew’s Half the world is watching me; not their best stuff
  • soundscapey or stagesetting tracks on QOTSA’s Songs for the Deaf, Motorpsycho’s Angels and Daemons at play And Blissard; not that worth it (the Blissard track was ok, but really quiet)
  • Pulp hid a single piano chord in a 2 second pre-gap on This is Hardcore; very curious. It’s not an intro to the first track, because it doesn’t fit with the sound at all.
  • Damien Rice hid a demo version of 9 Crimes (the first track) in the pregap; instead of piano and female vocals, he plays guitar and sings all the parts.
  • Got reacquainted with my favourite HTOA tracks: the orchestral quasi-wordless medley on the Luke Haines/Das Capital disc; the first Bloc Party album with a beautiful instrumental (up there with the hidden track at the end of Placebo’s first album; both bands delivering an atypical but stunning moodscape; the beautiful cover of Ben Kenobi’s Theme by Arab Strap on the Cherubs EP (no idea why that landed in my album dir, that needs to be fixed); the silly Soulwax skit for their second album.

Of course, Wikipedia has the last word on everything

I note that they think Pulp recorded a cymbal, not a piano. And now that I see the title of the QOTSA hidden track, I get the joke I think.

In total, on my album collection of 1564 full CD’s, I have 171 HTOA’s ripped, 138 tracks of pure digital silence, and only about 11 are actually useful tracks.

I expected to find more gems in my collection. I’ll go through ep’s, singles and compilations next just to be sure.

But with this code in hand, maybe it’s time to add something to morituri to save the silent HTOA tracks as pure .cue information.

4 Comments »

  1. One of the things we can do with graphical images is to embed other files between blocks. For example, with mp3′s or mp4′s you may find that a Distributor may have embedded a copyright and a “Part/catalog number”,

    Whatever you discover, will be interesting, I am sure

    Comment by Leslie Satenstein — 2013-5-11 @ 1:42 pm

  2. Hey,

    any interesting in integrating libburnia libraries to automatically burn stuff to the
    optical disc?

    Comment by Mario Danic — 2013-5-11 @ 3:45 pm

  3. s/interesting/interest

    Comment by Mario Danic — 2013-5-11 @ 3:45 pm

  4. “I’m sure there’s a fancy scientific term for that that I can’t remember right now”

    I believe you may be thinking of transitivity [1] :)

    [1] http://en.wikipedia.org/wiki/Transitive_relation

    Comment by Elvis Stansvik — 2013-5-12 @ 4:20 pm

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