[Standards-JIG] UPDATED: JEP-0158 (Robot Challenges)
ian.paterson at clientside.co.uk
Wed Sep 28 19:08:17 UTC 2005
> > Why MP3 for the audio CAPTCHAs instead of Ogg Vorbis or Speex?
> Lowest common denominator? Vorbis would be nice, though, since it's
Yes, lowest common denominator.
You can use Ogg, Vorbis or Speex, but the only one that you can be sure
a JEP-0158 client will support is MP3:
"Clients that support the CAPTCHA type MUST be able to play or render
the specified MIME-types (see table below). They MAY also support other
IMHO, to encourage client implementations, the JEP should only *require*
one format for each type of media (at least at this stage of the
I'm completely open to specifying other required formats where that
makes sense. Here are my priorities:
1. They MUST be available in constrained runtime environments (PDAs,
Phones, Web browsers etc).
2. Relatively patent free
3. Existance of both open source and inexpensive commercial
4. Efficient compression
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