It's an example I found in my instrument directory. Several files from
different sources (mostly Synth papers with CDs, i.e. Keys, Keyboards).
On is the of a shaker. Lame fails, also at rates of 320 kbit/s.
Lame 192 kbit/s sounds really bad. FhG (mp3encdemp31) is *much* better.
The file is about 50 KByte.
Lame FhG
96 coredump 3.5
128 coredump 2.5
160 4.3 2.5
192 4.1 2
224 3.9 1.5
256 3.7 1.2
319/320 3.5 1
There are a lot of core dumps!
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The 2nd thing I need is a MP3 pseudo encoder.
Input is a PCM file, Output is a PCM file.
But Frame handling is absolutely the same as a MP3 encode/decode process
with unlimited bitrate. There are no errors, except a little bit different
length and an other overall delay.
A PCM file filted via this pseudo encoder is better for comparing files.
There are no hidden effects because of different delays and file sizes.
$ lame input.wav output.mp3
$ lame --decode output.mp3 output.mp3.wav
$ lame --pseudo input.wav output.wav
$ # The gapless wave player
$ wp --repeat output.mp3.wav output.wav
$ # or
$ wp --repeat --random output.mp3.wav output.wav
Short pieces of sounds (1...2 s) are easy to compare.
If there is no structure, all is okay. If you hear differences, there are
artefacts.
Good: s s s s s s ...
Bad: s t s t s t ...
Worse: s shp s shp s shp ...
--
Mit freundlichen Gr��en
Frank Klemm
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