Hydrogenaudio Forums > Possible Decoding Bug In Lame

Full Version: Possible Decoding Bug In Lame

Hydrogenaudio Forums > Lossy Audio Compression > MP3 > MP3 - Tech

Jan S.

Sep 9 2002, 15:01

I tried decode an mp3 file and I get the following error:

CODE

input: C:\Documents and Settings\Jan Stanstrup\Skrivebord\test.mp3
(32 kHz, 2 channels, MPEG-1 Layer III)
output: C:\Documents and Settings\Jan Stanstrup\Skrivebord\test.wav
(16 bit, Microsoft WAVE)
skipping initial 1105 samples (encoder+decoder delay)
Frame# 1/11399 320 kbps bitstream problem: resyncing...
Frame# 2/11399 99 kbps bitstream problem: resyncing...
Frame# 3/11399 96 kbps bitstream problem: resyncing...
Frame# 4/11399 96 kbps bitstream problem: resyncing...
Frame# 5/11399 96 kbps bitstream problem: resyncing...
Error: sample frequency has changed in MP3 file - not supported
Frame# 6/11399 100 kbps bitstream problem: resyncing...
Error: sample frequency has changed in MP3 file - not supported
Frame# 7/11399 324 kbps bitstream problem: resyncing...
Error: sample frequency has changed in MP3 file - not supported
Frame# 8/11399 100 kbps bitstream problem: resyncing...
Error: sample frequency has changed in MP3 file - not supported
Frame# 9/11399 128 kbps bitstream problem: resyncing...
Error: sample frequency has changed in MP3 file - not supported
Frame# 10/11399 132 kbps

The list just goes on and on.

Notice that it says 32 kHz which is not what winamp reports.
It's a 192kbps btw and plays fine.
I have checked with other files and the problem seems to be file related.

Here's a cut (actually my upload stopped) of the mp3 file...:
http://powertothepeople.homestead.com/files/test.mp3

Jan S.

Sep 9 2002, 15:12

The mother of all evil.

ID3-tags!!!

It was id3-tags that caused this.

Still...isn't this just bad handling of id3-tags?

madah

Sep 9 2002, 16:56

Yes lame should be fixed to skip ID3/ID3v2 tags during decoding!

Also check my posting here:
http://www.audio-illumination.org/forums/i...906b7ee307db936

rjamorim

Sep 9 2002, 18:50

There is (was?) another bug in lame, related to encoding.

I believe Lame's libsndfile implementation is wrong, because it chokes on all my test files (IMA ADPCM, AIFF, aLaw, MS ADPCM...). Lame reports the input as RAW PCM and the encoded result is noise. The same files are handled properly by Winamp with PP's in_wave, CoolEdit, WaveGain...

Gabriel

Sep 10 2002, 01:09

A stupid question, but is your binary compiled with libsndfile?

Jan S.

Sep 10 2002, 01:43

I tried both the compile here: http://www.audio-illumination.org/forums/i...281ba1ae9cf486d

and Mitiok's.

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