Could we add gapless to Apple's AAC encoder? Reply #25 – 2005-06-27 12:03:37 Thanks for the info, rjamorim and bond To summarize the current situation, MPEG-4 specification does not define a field to store encoder's delay. To store the delay value, we must either:1) Define own field in "udta" MP4 box. Hack FAAD source code to utilize the information. This is straightforward approach to the current situation, but Ivan posted in the thread, "Next revision of nero encoder will have Nero Digital Gapless data embedded in the MP4 file, fully compatible with the ISO File Format guidelines." I'm not a developer of MPEG-4 AAC encoder and don't want to propose another specification while Nero Digital Gapless data is about to be released (or already been released?) by a major MPEG-4 AAC developer. We should avoid such chaotic situation beforehand.2) Use "edts" MP4 box for this job. Hack FAAD source code to support "edts" MP4 box. I don't think this approach is a good idea because "edts" box seems to aim at stream editing (cutting and combining) and should not be used just for gapless playback.And another problem is,,, I'm not so MP4/AAC freak.