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Rockbox Ports are now being developed for various digital audio players!

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| | |-+  gapless playback on ipod 5g!
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Author Topic: gapless playback on ipod 5g!  (Read 3146 times)

Offline podfreak

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gapless playback on ipod 5g!
« on: December 30, 2007, 07:11:25 AM »
I have got 30gb 5.5g ipod with rockbox installed on it, everything's fine but there seems to be too much of gap between playback. Can u help me with it?
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Offline AlexP

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Re: gapless playback on ipod 5g!
« Reply #1 on: December 30, 2007, 07:12:28 AM »
What format?  How were they encoded?  Details...
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Offline podfreak

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gapless playback on ipod 5g!
« Reply #2 on: December 30, 2007, 07:16:32 AM »
It's in mp3 format. Sorry, but what do u mean by how were they encoded?
 
« Last Edit: December 30, 2007, 07:18:26 AM by podfreak »
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Offline AlexP

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Re: gapless playback on ipod 5g!
« Reply #3 on: December 30, 2007, 07:22:42 AM »
What encoder did you use to encode them?  MP3 is not natively gapless, but those encoded by lame with a gapless switch (--no-gap? - not sure) include extra information that lets compatible programs such as rockbox play them back gaplessly.
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Offline podfreak

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Re: gapless playback on ipod 5g!
« Reply #4 on: December 30, 2007, 07:30:24 AM »
I haven't used any encoder! I transferred the mp3 from my computer through itunes.
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Offline AlexP

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Re: gapless playback on ipod 5g!
« Reply #5 on: December 30, 2007, 07:34:00 AM »
The MP3s must have been made somehow in the first place.  Did you rip a CD, or were they downloaded from itunes?  If downloaded from itunes then I don't know how they encode their DRM free files - if they don't use lame to properly gaplessly encode them, then as far as I know they will not be able to playback gaplessly.
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Offline AlexP

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Re: gapless playback on ipod 5g!
« Reply #6 on: December 30, 2007, 07:43:23 AM »
OK.

Lame is a program that encodes MP3s, for instance if you rip music from a physical CD.  As you already have the MP3s but not the source (i.e. the CD), don't worry.  You don't want to re-encode lossy (i.e. MP3) files as the quality will nose-dive.

As I say, I don't know how itunes encode their MP3s.  Do they play anything like gaplessly on your PC, or in the Apple firmware?  Note that many programs will just try to detect and remove silence which isn't proper gapless.
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Offline podfreak

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Re: gapless playback on ipod 5g!
« Reply #7 on: December 30, 2007, 07:51:39 AM »
When i transferred the MP3s to itunes playlist, it was showing "determining gapeless". There was a gapless playback in apple firmware.
 
« Last Edit: December 30, 2007, 07:54:15 AM by podfreak »
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Offline AlexP

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Re: gapless playback on ipod 5g!
« Reply #8 on: December 30, 2007, 07:55:05 AM »
I don't own an iPod or use itunes, but I believe what itunes does is when you transfer the music it calculates the silence and writes itunes specific metadata to the MP3 which the Apple firmware then uses to remove the silence.  Rockbox doesn't make use of this non-standard information.

I'm getting into memory territory here, so I may be getting details a bit wrong.
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Offline podfreak

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Re: gapless playback on ipod 5g!
« Reply #9 on: December 30, 2007, 07:57:49 AM »
So is there any solution for this problem? Do i have to encode again? Thanks for the reply anyway!
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Offline AlexP

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Re: gapless playback on ipod 5g!
« Reply #10 on: December 30, 2007, 08:02:04 AM »
I'm not too sure I'm afraid.  You don't want to recode, as not only will it not fix the gapless, it will make the quality terrible.  Hopefully someone else can chip in and see if rockbox can do anything with itunes encoded mp3s
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Offline podfreak

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Re: gapless playback on ipod 5g!
« Reply #11 on: December 30, 2007, 08:05:21 AM »
Anyway, thanks for the reply dude!
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Offline Lear

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Re: gapless playback on ipod 5g!
« Reply #12 on: December 30, 2007, 10:17:07 AM »
Quote from: BigBambi on December 30, 2007, 08:02:04 AM
Hopefully someone else can chip in and see if rockbox can do anything with itunes encoded mp3s

If the information is stored in ID3V2 tags, and the format used is similar to the one for AAC files, it should be fairly easy, as Rockbox supports the AAC gapless information.
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Offline AlexP

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Re: gapless playback on ipod 5g!
« Reply #13 on: December 30, 2007, 11:07:08 AM »
Well a quick google brings up this which suggests it is in tags:

http://www.hydrogenaudio.org/forums/index.php?s=&showtopic=48231&view=findpost&p=430981

But I haven't looked long enough to be sure.  If I get time I might look more later, but I don't use itunes or have an iPod so I don't really care.
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Offline soap

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Re: gapless playback on ipod 5g!
« Reply #14 on: December 30, 2007, 08:06:36 PM »
Don't use the -nogap command line switch.
That is a dirty hack for old players, LAME since 3.90 implements gapless in a better fashion, Rockbox (on machines other than the Archos players) doesn't need it (-nogap), and did I mention it is a dirty hack?
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