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Topic: LAME producing different results on different tools. Why? (Read 673 times) previous topic - next topic
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LAME producing different results on different tools. Why?

I'm trying to convert a WAV file (decoded from FLAC) to MP3 CBR @ 320 (yes, I know that that there are more reasons in favor of VBR than not, it's more of a whim of mine than anything else) and so far, ffmpeg has been doing all I need. However, I can see a very consistent difference between LAME CLI, ffmpeg and Audacity with LAME when comparing with a few tools:

LAME 3.100 CLIffmpeg 4.2 (Lavf 58.29.100/LAME 3.100) CLIAudacity 2.3.2 (LAME 3.100)
MediaInfoConstant/320/Encoder Settings: -m s -V 4 -q 3 -lowpass 20.5Variable/320/Constant/320/Encoder Settings: -m s -V 4 -q 3 -lowpass 20.5
Spectral AnalysisAlmost nothing between shelf and cutoffAlmost nothing between shelf and cutoffConsiderably more happening between shelf and cutoff
Fakin' the Funk*256kbps192kbps320kbps
*I know that this tool is not a really good indicative and is probably misreading info, but it seems to a least notice the visible difference the Audacity file has in it's spectrogram

Commands/settings used for the encodes:

LAME: lame -b 320 -q 3 -m s [File].wav [File].mp3
ffmpeg: ffmpeg  -i "[File].wav" -c:a libmp3lame -b:a 320k  -compression_level  2 -cutoff 20500 -joint_stereo 0 "[File].mp3" -y
Audacity: Import .wav file > Export as MP3 > Insane preset, Stereo, Default Variable Speed

What I'd like to understand is why all of this results are coming different, if they are all, in theory, LAME


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