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gapless in Winamp - not gapless in Rockbox?

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zfox:

--- Quote from: markun on October 02, 2009, 06:30:19 PM ---Do you have some test files for me?

--- End quote ---

http://users.auth.gr/~kyriak/temp/

markun:
Thanks for the files.

I see 4 Nero specific atoms in the mp4 files: "ndrm", "flags" and "chpl". Not sure of any of those is used to store the gapless information. I can't find much information online.

zfox:
Making a question I got the following reply...

The gapless data is in the chapter list "chpl". MP4Box can handle this, so that's an example of how to read it. Basically, the chapter describes when the track starts in the decoded data and when it ends.

markun:
I made a test file and get the following info:

with mp4box -info:

--- Code: ---... Duration 00:00:31.059
... 1338 samples

--- End code ---

with mp4box -diso:


--- Code: ---  <ChapterListBox>
  <BoxInfo Size="26" Type="chpl" />
  <FullBoxInfo Version="1" Flags="0" />
  <Chapter name="" startTime="00:00:00.059" />
  </ChapterListBox>

--- End code ---

in foobar2000:


--- Code: ---Duration : 0:31.000 (1367100 samples)

--- End code ---

Do you think these 0.059 seconds should be trimmed from the end or the beginning? Well, we can just implement it and test both of course.

zfox:
Decoding my files to wav with winamp (no gapless playback for nero files) you see the gap (with a wav editor) at the beginning.

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