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The no gapless sample, Impossible to encode gapless
Pio2001
post Feb 1 2004, 20:37
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Here is the first original file.
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Pio2001
post Feb 1 2004, 20:38
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...and the second.

These two files play gaplessly, but as soon as you encode them to MP3 or MPC, an audible click between them appear, even with Foobar2000 gapless playback.
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Attached File  original2.lpac ( 305.27K ) Number of downloads: 47
 
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hujay
post Feb 2 2004, 04:01
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2 secs at 0dB

UJ
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Attached File  silent1.wav ( 348.56K ) Number of downloads: 180
 
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hujay
post Feb 2 2004, 04:02
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3 secs at 0dB

UJ
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Attached File  silent2.wav ( 520.39K ) Number of downloads: 157
 
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hujay
post Feb 2 2004, 04:07
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2 secs silence, 2 secs at 0dB, 2 secs silence, 3 secs at 0dB, 1 sec silence

UJ
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hujay
post Feb 2 2004, 05:39
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Stripped and butted mp3 files

UJ
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evereux
post Feb 2 2004, 11:10
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Sonogram below of the offending area. File encoded to mp3 with LAME version 3.90.3 MMX using --alt-preset 128.

Decoded file sizes in Foobar2000 are the same as the original.
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Biont
post Feb 2 2004, 11:14
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So, what's the problem, encode into ogg and you'll have your sample gapless.
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evereux
post Feb 2 2004, 11:22
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Yup, can't hear a problem with Ogg.

Edit: I wouldn't know how to check this, but is there something non-standard about the file size of the input wav?

This post has been edited by evereux: Feb 2 2004, 11:32


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criZZb
post Feb 2 2004, 12:56
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QUOTE (Pio2001 @ Feb 1 2004, 08:38 PM)
These two files play gaplessly, but as soon as you encode them to MP3 or MPC, an audible click between them appear, even with Foobar2000 gapless playback.

IIRC, zZzZzZz has his own experimental DSP, to smooth the transition in such cases, you can ask him for it.


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Peter
post Feb 2 2004, 12:57
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QUOTE (criZZb @ Feb 2 2004, 02:56 PM)
QUOTE (Pio2001 @ Feb 1 2004, 08:38 PM)
These two files play gaplessly, but as soon as you encode them to MP3 or MPC, an audible click between them appear, even with Foobar2000 gapless playback.

IIRC, zZzZzZz has his own experimental DSP, to smooth the transition in such cases, you can ask him for it.

... which has been verified not to help on this sample.
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hujay
post Feb 2 2004, 13:29
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Waveform artefact produced by imperfect silence detection, compare with the perfect cut and shut in the file 'glitch.jpg' above.

UJ
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