[Lame-dev] [ lame-Bugs-1313100 ] LAME segfaults with low bitrate encoding

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Bugs item #1313100, was opened at 2005-10-04 17:40
Message generated for change (Comment added) made by bouvigne
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Category: Libraries
Group: Quality
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Jack Twilley (jtwilley)
Assigned to: Nobody/Anonymous (nobody)
Summary: LAME segfaults with low bitrate encoding

Initial Comment:
I have a program which takes in text files and
generates WAV files of Morse code with libsndfile.  I
then push these WAV files through LAME, and 99.5% of
the time there's no problem.

That other 0.5% of the time, though, I get segmentation
faults.

Attached is the source to the Morse code generator,
called "tomorse.c".  I compile it on FreeBSD with the
following command line:

gcc -o tomorse tomorse.c -I/usr/local/include
-L/usr/local/lib -lsndfile

Your mileage may vary.  I have also attached one of the
input files which consistently causes segmentation
faults.  I generate the Morse code WAV files with the
following command:

./tomorse -c 20 -s 5 < 38.txt > 38-5.wav

Be warned that this WAV file is over 200M in size. 
I've listened to the WAV file and it sounds right.  Now
use LAME to convert the WAV to MP3 like this:

lame --quiet -f -m s -a --resample 8 38-5.wav 38-5.mp3

You will get many "Internal buffer inconsistency.
flushbits <> ResvSize" messages, a couple of other
errors and a core dump at the end.

I'm almost positive it's not a fault of the tomorse
code, but I've asked the folks on the libsndfile
mailing list to look it over just to make sure.  It is
interesting that the 13-wpm version of the WAV file
does not have the problems that the 5-wpm version does.
 If you use this command line:

./tomorse -c 20 -s 13 < 38.txt > 38-13.wav

And this command line:

lame --quiet -f -m s -a --resample 8 38-13.wav 38-13.mp3

No errors are reported.  Thanks for your time!

I am using LAME version 3.96.1 on FreeBSD 5.4-STABLE.

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>Comment By: Gabriel Bouvigne (bouvigne)
Date: 2005-11-12 18:25

Message:
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Should be fixed in current CVS, please re-open if still not
working.

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Comment By: Takehiro TOMINAGA (takehiro)
Date: 2005-10-08 06:12

Message:
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user_id=1071

I didn't test it yet, but this is probably related #1227632.


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