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Could we add gapless to Apple's AAC encoder?, task for iTunesencode or other?
guruboolez
post Jun 21 2005, 08:11
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I have a question about a possible new iTunesEncode feature (or any other program driving Apple's AAC encoder). Wouldn't it be possible to add a gapless feature? It might sound silly, but after all, nyaochi did it with the latest Fraunhofer MP3 encoder (here and here). I'm not a coding expert -I'm not a coder at all- but I think that doing it wouldn't be an impossible task.

Adding somewhere in the tags the precise offset (constant for Apple's encoder) and calculating the amount of padded sample maybe suffice? I don't really know. faac and Nero AAC are gapless, and apparently Apple is not hurry to implement this feature. It's a pity, because Apple's encoder is pretty good. Gapless playback is not possible on any iPod, but on a computer (playing with foobar2000 as exemple) users would benefits from it.

Could we reproduce Nyaochi's ACMenc patch to work with iTunes? Or make something similar? What do you think?
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M
post Jun 23 2005, 02:37
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Pardon my ignorance on the technicalities involved, but doesn't the MPEG-4 structure allow for chapter stops, or index points of some sort? And if so, wouldn't it be simpler to re-encode an album as a single *.m4a file, with possible plugin or hardware support for using those indices? That would eliminate the entire problem of offsets, calculated or actual, and enable true gapless playback for any player that didn't choke on the metadata. (Yes, I realize this would entail encoding each album as a single, large track, and that it would require players to buffer portions of the track - ideally, to buffer until the next index/chapter marker - but in my end-user/non-programmer/non-hardware-designer/feeble brain the method just makes sense!)

- M.
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soundcheck
post Jun 23 2005, 06:31
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QUOTE (M @ Jun 22 2005, 09:37 PM)
Pardon my ignorance on the technicalities involved, but doesn't the MPEG-4 structure allow for chapter stops, or index points of some sort? And if so, wouldn't it be simpler to re-encode an album as a single *.m4a file, with possible plugin or hardware support for using those indices?
*


Audible is doing exactly what you describe for their audiobooks... large m4a files with chapter stops. It could potentially be used for true gapless albums.

Unfortunately it's still a mystery as to how the feature is implemented... sad.gif
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Posts in this topic
- guruboolez   Could we add gapless to Apple's AAC encoder?   Jun 21 2005, 08:11
- - Otto42   Short answer: no. Long answer: yes, but I'm n...   Jun 21 2005, 18:25
|- - Mike Giacomelli   QUOTE (Otto42 @ Jun 21 2005, 09:25 AM)Short a...   Jun 22 2005, 05:35
|- - Gabriel   QUOTE How would you get the encoder delay out of i...   Jun 22 2005, 08:56
- - Tropican   This may be a dumb question, but if the encoding d...   Jun 21 2005, 23:55
- - nyaochi   I don't know much about AAC and MP4 container ...   Jun 22 2005, 01:40
- - Tropican   QUOTE (nyaochi @ Jun 21 2005, 07:40 PM)We nee...   Jun 22 2005, 02:19
|- - nyaochi   QUOTE (Tropican @ Jun 22 2005, 10:19 AM)How d...   Jun 22 2005, 03:11
- - Tropican   Sorry, my last post was poorly written. QUOTE (ny...   Jun 22 2005, 04:10
- - Tropican   QUOTE (Gabriel @ Jun 22 2005, 02:56 AM)you ha...   Jun 22 2005, 22:31
- - M   Pardon my ignorance on the technicalities involved...   Jun 23 2005, 02:37
|- - soundcheck   QUOTE (M @ Jun 22 2005, 09:37 PM)Pardon my ig...   Jun 23 2005, 06:31
|- - bond   QUOTE (soundcheck @ Jun 23 2005, 07:31 AM)QUO...   Jun 23 2005, 20:20
|- - soundcheck   QUOTE (bond @ Jun 23 2005, 03:20 PM)QUOTE (so...   Jun 23 2005, 23:06
|- - bond   QUOTE (soundcheck @ Jun 24 2005, 12:06 AM)The...   Jun 24 2005, 09:22
|- - soundcheck   QUOTE (bond @ Jun 24 2005, 04:22 AM)hm could ...   Jun 24 2005, 21:00
- - Mono   Actually that's Apple's official stance: Q...   Jun 23 2005, 04:13
- - westgroveg   I think guruboolez needs CASE.   Jun 23 2005, 05:55
- - bond   ok so its seems to be indeed a non-mp4 file, thx...   Jun 25 2005, 10:09
|- - soundcheck   QUOTE (bond @ Jun 25 2005, 05:09 AM)ok so its...   Jun 25 2005, 18:29
|- - M   QUOTE (soundcheck @ Jun 25 2005, 12:29 PM)I t...   Jun 25 2005, 19:13
- - bond   can you run mp4box's -info on the itunes audib...   Jun 25 2005, 19:05
- - nyaochi   Since no one seems to take this task, I read the s...   Jun 27 2005, 03:04
|- - rjamorim   QUOTE (nyaochi @ Jun 26 2005, 11:04 PM)Does a...   Jun 27 2005, 03:57
|- - Juho Vähä-Herttua   I just implemented true gapless playback of AAC fi...   May 2 2006, 13:56
- - bond   somehow i get the feeling that this "hacking...   Jun 27 2005, 09:59
- - nyaochi   Thanks for the info, rjamorim and bond To summa...   Jun 27 2005, 12:03
- - Tropican   QUOTE (nyaochi @ Jun 27 2005, 06:03 AM)1) but...   Jun 29 2005, 02:58
- - loophole   http://www.apple.com/quicktime/tutorials/chaptertr...   Jun 29 2005, 05:04
|- - Fofer   Great info here, looks like this is a great way fo...   Jul 10 2005, 17:04
- - cvkslashdot   Check my tutorial w/ images if you have a mac: ht...   Jul 20 2005, 01:15
- - Otto42   This isn't really "gapless" as I see...   Jul 20 2005, 16:35
- - nyaochi   I bet Apple will implement the gapless feature in ...   Jul 20 2005, 16:49
- - e-San   I know topic seems to be dead but i am quite shure...   Mar 28 2011, 09:10


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