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Bookmarks vs. Resume - Bug or feature?

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PSBlake:
It's been a long time since I've posted anything, but here goes:

How exactly does the resume function differ from the bookmark function?  I ask because, in both the ipod Nano and iriver H10/20gb builds, as far back as I've been using rockbox, resume-from-shutdown and resume-from-bookmark behave differently.  Not enough to actually impede functionality or anything, but enough to be noticeable, and enough to make me wonder if the difference is intentional.

Specifically, when resuming from shutdown on a VBR mp3 file, resume will pick up a few seconds after the point where the unit was actually shut down.  The specific amount of time varies depending on the average bitrate of the file in question: Lower bitrates result in a larger jump.  Resuming from bookmark, however, always leads to the exact place at which the bookmark was set.

I have only noticed this behavior with VBR mp3s, although I have not tested it with other VBR file formats.  It does not affect CBR files, insofar as I have noticed.  It has been present in rockbox for as long as I have been aware of rockbox, certainly since the first H10/20gb builds.  It is less noticable in high bitrate files, and almost undetectable at bitrates approaching 160kbps average.  However, I use VBR (rather irrationally) in lower bitrates for audiobooks, and the jump can sometimes result in lost sentences.

saratoga:

--- Quote from: PSBlake on September 23, 2008, 07:02:46 PM ---Specifically, when resuming from shutdown on a VBR mp3 file, resume will pick up a few seconds after the point where the unit was actually shut down.  The specific amount of time varies depending on the average bitrate of the file in question: Lower bitrates result in a larger jump.

--- End quote ---

I just tried this, and couldn't reproduce.  Seems to start from exactly the same point (to within a drum beat anyway) for me using LAME V2 and 128k CBR on a sansa. 

karashata:

--- Quote from: saratoga on September 23, 2008, 07:20:05 PM ---[...] using LAME V2 and 128k CBR on a sansa. 

--- End quote ---

The OP did say it only seemed to happen on VBR mp3's...

saratoga:

--- Quote from: karashata on September 23, 2008, 07:22:10 PM ---
--- Quote from: saratoga on September 23, 2008, 07:20:05 PM ---[...] using LAME V2 and 128k CBR on a sansa. 

--- End quote ---

The OP did say it only seemed to happen on VBR mp3's...

--- End quote ---

V2 is VBR.

karashata:
Oh, my bad then.

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