#272 Incorrect Bitrate with ABR und --resample, LAME 3.98b4

[Robert Hegemann]

Original report by ggf31416 at http://www.hydrogenaudio.org/forums/index.php?showtopic=55890&pid=502045&st=0&#

I'm experiencing a problem with LAME 3.98b4. When ABR mode is selected and --resample is set to 24 kHz or lower the file is encoded using the maximum bitrate for MPEG-2 (160 kbps) or MPEG-2.5 (64 kbps). When --resample is not used the problem doesn't happend. I'm using the rarewares compile.

Does anybody else have this problem?

D=> LAME --abr 56 --resample 24 Navidad.wav A46r24.mp3
LAME 3.98 (beta 4, Jun 24 2007) 32bits (http://www.mp3dev.org/)
CPU features: MMX (ASM used), SSE (ASM used), SSE2
Resampling: input 44.1 kHz output 24 kHz
Using polyphase lowpass filter, transition band: 11710 Hz - 12000 Hz
Encoding Navidad.wav to A46r24.mp3
Encoding as 24 kHz average 160 kbps j-stereo MPEG-2 Layer III (4.8x) qval=3
Frame | CPU time/estim | REAL time/estim | play/CPU | ETA
2502/2502 (100%)| 0:03/ 0:03| 0:03/ 0:03| 15.625x| 0:00
8 [ 2] *
16 [ 0]
24 [ 0]
32 [ 0]
40 [ 0]
48 [ 0]
56 [ 0]
64 [ 0]
80 [ 0]
96 [ 3] *
112 [ 21] *
128 [ 312] %**************
144 [1460] %%%%%***************************************************************
160 [ 704] %%%%%****************************
-------------------------------------------------------------------------------
kbps LR MS % long switch short %
146.1 8.3 91.7 84.0 9.3 6.7
Writing LAME Tag...done
ReplayGain: -10.4dB

LAME --abr 56 Navidad.wav A56.mp3
LAME 3.98 (beta 4, Jun 24 2007) 32bits (http://www.mp3dev.org/)
CPU features: MMX (ASM used), SSE (ASM used), SSE2
Resampling: input 44.1 kHz output 24 kHz
Using polyphase lowpass filter, transition band: 9774 Hz - 10065 Hz
Encoding Navidad.wav to A56.mp3
Encoding as 24 kHz average 56 kbps j-stereo MPEG-2 Layer III (13.7x) qval=3
Frame | CPU time/estim | REAL time/estim | play/CPU | ETA
2502/2502 (100%)| 0:03/ 0:03| 0:03/ 0:03| 15.187x| 0:00
8 [ 4] *
16 [ 0]
24 [ 0]
32 [ 0]
40 [ 48] ****
48 [1083] %%******************************************************************
56 [ 756] %***********************************************
64 [ 241] %***************
80 [ 157] %%********
96 [ 68] %****
112 [ 116] %*******
128 [ 29] %*
144 [ 0]
160 [ 0]
-------------------------------------------------------------------------------
kbps LR MS % long switch short %
58.9 2.7 97.3 85.5 8.5 6.1
Writing LAME Tag...done
ReplayGain: -10.4dB

[Robert Hegemann]

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Originator: YES

There was a typo in patch Revision 1.294 "restrict mpeg 2.5 to 64kbps"
which set the average bitrate up to the maximum allowed bitrate.

This bug is fixed in CVS now.