The MPEG2 code of lame3.29 seems to be broken:
+ try to encode with -b40 at 40 kbits and you
will get a 16 kbits stream
+ and lame will encode it sometimes twice! upto 200%
> robert@bob:~/lame3.29.w1 > ./lame -b 40 -h -k -X 5 /dos/d/grab/t14.22.wav
/dos/d/grab/t14.22.b40.mp3
> LAME version 3.29 (www.sulaco.org/mp3)
> GPSYCHO: GPL psycho-acoustic model version 0.73.
> Found WAV header: 22.1kHz stereo
> Encoding /dos/d/grab/t14.22.wav to /dos/d/grab/t14.22.b40.mp3
> Encoding as 22.1 kHz 16 kbps j-stereo MPEG2 LayerIII file
> Frame | CPU/estimated | time/estimated | play/CPU | ETA
> 5593/ 5593(100%)| 0:01:51/ 0:01:51| 0:01:51/ 0:01:51| 2.6490 | 0:00:00
> 5760/ 5593(102%)| 0:01:54/ 0:01:51| 0:01:54/ 0:01:51| 2.6481 | 0:00:00
+ maybe a MPEG2 vbr should get a Xing header?
at least optional via a switch?
+ finally, whats the dynamic range of a MPEG2 layer3
stream at 24, 22 and 16 kHz? Is it half the
dynamic range of a 44 kHz MPEG1 layer3 stream?
the MDCT scaling of the ath should consider this.
Robert
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