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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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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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JohnV
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..


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Juha Laaksonheimo
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