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Original File Length (OFL) for mp3, mp3Pro, aac..., Gapless playback becomes possible.
Ivan Dimkovic
post Mar 24 2003, 19:17
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Nero MPEG4 developer

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On AES 114th held in Amsterdam, Thomson Multimedia researchers presented a way to signal exact codec delay and file length in a backwards compatible fashion - in current mp3, mp3pro, aac, etc... coding algorithms. It is known as OFL - or Original File Length

Algorithm deals with non-exact file length and delays introduced by modern frequency-domain coding systems. Data for OFL is written in ancilliary data so it is completely backwards compatible - decoder without OFL will just ignore the OFL data.

OFL will allow gapless playback with OFL compatible decoders.

AES paper number is: 5830

PS: They are mentioning LAME in the paper smile.gif

This post has been edited by Ivan Dimkovic: Mar 24 2003, 19:26
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post Jul 27 2003, 17:26
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QUOTE (mmortal03 @ Jul 27 2003, 12:26 PM)
Does anyone know if progress is being made on OFL, or should I say, the implementation of it?  It is looking more and more like this is just what mp4 and aac need.  BTW, is anyone here at hydrogenaudio a member of the AES?

Well.. I was pushing gapless to Nero AAC/FAAD2, and Menno got it even working pretty soon, but there were problems with other components of Nero (plugin usage related), so it didn't make it.
Maybe someday in the future..

Juha Laaksonheimo
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