discussion of the Creative Commons Metadata work

["Nathan R. Yergler" <nathan AT yergler.net>]

The hash doesn't get included in the file's tags.  It is included in the 
verification RDF.  I use some Python code to calculate the hash.  When 
you verify a license, the verifying application re-calculates the hash, 
and then compares it with the value stored in the verification RDF.

I have been able to confirm the problem, although the documentation I 
found seemed to indicate that the error was either for compressed 
headers or out of sync frames.  I'm working on a bug fix now.

Nathan

Marcus Valentine wrote:

> Hi
>
> I've been thinking about a workaround. I've been using the tag editor 
> in "Winamp" to edit the ID3v2 Tag of the mp3.  It is straightforward 
> to add the   required information to the "copyright" field. Then I was 
> planning simply to add the sha1 value that ccPublisher calculates into 
> the "comment" field.
>
> But then I started pondering, how does ccPublisher calculate the hash 
> of a file when the hash it calculates needs to be part of the file? Or 
> I am missing something here? Do the hash calculations not include the 
> body?
>
> Marcus Valentine
>
> At 23:10 09/12/2004, you wrote:
>
> > Hi
> >
> > The original attempt used ccTag 0.5.7. I have now tried with 0.9.11 
> > of ccPublisher, and get the same results - Windows Media Player will 
> > not read the tagged file due to the presence of the compressed ID3 
> > header.
> >
> > Question - is it possible to tag an MP3 without using a "compressed 
> > ID3" header? Is there such a thing as an uncompressed ID3 header?
> >
> > Some observations on ccPublisher:
> >
> > 1. It looks good and it's easy to use. I liked the fact it offers to 
> > save the
> > html markup in a text file. I'd forgotten it would silently embed the 
> > tags in the original file (as does ccTag). Is there an argument for a 
> > "Save as" facility for the tagged MP3s?
> >
> > 2. When you get the end of the process, the gui just sits there 
> > enigmatically. How about a "quit" or "start over" button?
> >
> > 3. In the windoze version, on some pages (e.g. "Tell Us About Your 
> > File"),  the "Prev" and "Next" buttons are falling off the bottom 
> > edge of the gui.
> >
> > 4. How are you meant to find this application from the creative 
> > commons site? Is there not an argument to reference it in
> >
> > http://creativecommons.org/technology/embedding
> >
> > Into the realms of pedantry now I'm afraid:
> >
> > 5. Clicking the "How does this work" button on page 1 gives a window 
> > reporting version 0.9.8. The installer file name says it is 0.9.11
> >
> > Best regards
> >
> > Marcus Valentine
> >
> > At 21:15 08/12/2004, you wrote:
> >
> > > Marcus,
> > >
> > > Thanks for checking out the app.  Did you attempt to do the 
> > > embedding with ccTag or ccPublisher?  ccPublisher is the newer, 
> > > better (I think) version of ccTag.  While it's primary advantage is 
> > > that it allows you to seamlessly publish to the Internet Archive, it 
> > > also preserves the "self-hosting" functionality present in ccTag.  I 
> > > strongly encourage you to try it if you haven't yet.  You can 
> > > download it at 
> > > http://mirrors.creativecommons.org/software/publisher.  There's an 
> > > MSI file for Windows and a DMG for Mac OS X.
> > > I'll try tagging a file with ccPublisher and using Windows Media 
> > > Player myself this evening.  Please let me know if you still run 
> > > into problems using ccPublisher.
> > >
> > > Thanks again for checking out our apps,
> > >
> > > Nathan R. Yergler
> > > Software Engineer
> > > Creative Commons
> > >
> > >
> > > Marcus Valentine wrote:
> > >
> > > > Hi
> > > >
> > > > As buried in the comments on 
> > > > http://creativecommons.org/weblog/entry/4279,
> > > >
> > > > an mp3 tagged with ccTag is unreadable by Windows Media Player.
> > > >
> > > > Windows Media Player 10 helpfully provides the following information:
> > > >
> > > > <Windows Media Player says>
> > > >
> > > > C00D0BB8: Cannot play the file
> > > >
> > > > Windows Media Player cannot play the file. You might encounter this 
> > > > error message for the following reason:
> > > >
> > > > You are trying to play an MP3 file that contains compressed ID3 
> > > > headers. The ID3 header is a portion of the file that stores the 
> > > > song's album information (for example, the song name, artist name, 
> > > > album name, and genre). This information is sometimes called a "tag."
> > > >
> > > > To fix the problem, make a copy of the file and then use a 
> > > > non-Microsoft ID3 tag editing program to remove or reset the file's 
> > > > ID3 headers. After you remove the ID3 headers, Windows Media Player 
> > > > should be able to play the MP3 file.
> > > >
> > > > </Windows Media Player says>
> > > >
> > > > To my mind this is a serious problem. I am attempting to embed a 
> > > > media player in a web page to play tagged mp3s. The following 
> > > > simple snippet of code successfully embeds a player when viewed 
> > > > with Firefox with quicktime available.
> > > >
> > > > <embed src="my_mp3.mp3" type="video/Quicktime"></embed>
> > > >
> > > > When viewed in IE, it appears IE decides to embed windows media 
> > > > player as the player, without any help from quicktime, thank you 
> > > > very much. I am not aware of a way of forcing IE to use quicktime.
> > > >
> > > > Needless to say, when a tagged MP3 is used, windows media player 
> > > > then folds its arm and refuses to play the MP3.
> > > >
> > > > Any ideas?
> > > >
> > > > Marcus Valentine
> >
> > _______________________________________________
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>
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