[ lame-Bugs-3555476 ] Resampling ruins end of audio loop

Bugs item #3555476, was opened at 2012-08-08 17:41
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Category: Unknown
Group: Quality
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Steven Vachon (pr0m3th)
Assigned to: Nobody/Anonymous (nobody)
Summary: Resampling ruins end of audio loop

Initial Comment:
Before encoding, the loop plays back smoothly; after, there seems to be a half-second gap at the end.

The command I'm using is:
lame -q 0 -V 8 -b 32 -B 320 --resample 44.1 -m j music.wav music.mp3

I've tried all sorts of variations of the above. The output file must be 44100hz so that Adobe Flash will accept it for import.

WAV and MP3 files:
http://www.svachon.com/lame-before-after.zip

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Comment By: Michael ()
Date: 2012-08-16 07:21

Message:
As far as I know, this cannot be avoided. There's a popular page people
point to: http://www.compuphase.com/mp3/mp3loops.htm that talks about
making loop-able MP3 tracks, but it's quite involved, the program didn't
work for me, and it sacrifices audio quality, from my understanding.

Sorry to do a shameless plug, but I'm actually working on a program that'll
let you compile your MP3s into an SWF file and it'll handle take care of
this gap for you (SWF files just skip these silent samples... long story).
If you're interested, I can let you know when I have a working pre-alpha
version (hopefully by the end of this weekend). I'd be happy to have a
tester :)

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Comment By: Steven Vachon (pr0m3th)
Date: 2012-08-15 18:11

Message:
Oh, my bad. I just read through the part of the technical FAQ that pertains
to my issue, and I'm not really sure what the solution would be. Can
ENCDELAY have a value of 0? If so, why doesn't it already to avoid this
issue?

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Comment By: Michael ()
Date: 2012-08-15 13:07

Message:
This should be expected. The technical FAQ explains this:
http://lame.sourceforge.net/tech-FAQ.txt

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Comment By: Steven Vachon (pr0m3th)
Date: 2012-08-08 17:50

Message:
Actually, it adds the silence to the BEGINNING of the mp3 file, not the
end.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100290&aid=3555476&group_id=290

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