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MP3 / Re: Low bitrate MP3 (+ unsupported bitrates)
Last post by Kraeved -Quote
MPEG-1 Audio Layer III: 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 kbps
MPEG-2 Audio Layer III: 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 kbps
MPEG-2.5 Audio Layer III: 8, 16, 24, 32, 40, 48, 56 kbps
These are the bitrates for MP3 CBR mode. There is no 12 kbps among them. Thus, to get 12 kbps file, which can be played back on a wide range of audio equipment, you have no choice but to use VBR mode (or ABR as a variation of it) so that some of the data is compressed at a lower bitrate and some of the data is compressed as a higher bitrate, producing the output that is as close as possible to the bitrate you specified.
RTFM #2
Quote
=======================================================================
Output sampling frequency in kHz
=======================================================================
--resample n
where n = 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48. The values as Hz
instead of Khz are also supported. Else, the value will be ignored.
Output sampling frequency. Resample the input if necessary.
If not specified, LAME may sometimes resample automatically
when faced with extreme compression conditions (like encoding
a 44.1 kHz input file at 32 kbps). To disable this automatic
resampling, you have to use --resamle to set the output samplerate
equal to the input samplerate. In that case, LAME will not
perform any extra computations.
gxlame --abr 12 -h --lowpass 3500 --resample 11025 in.wav out.mp3
Code: [Select]
GXLame-t5
CPU features: MMX (ASM used), SSE (ASM used), SSE2
Using polyphase lowpass filter, transition band: 3423 Hz - 3556 Hz
Encoding history.wav to history.mp3
Encoding as 11.025 kHz single-ch MPEG-2.5 Layer III (14.7x) average 12 kbps qval=0
Frame | CPU time/estim | REAL time/estim | play/CPU | ETA
324/324 (100%)| 0:00/ 0:00| 0:00/ 0:00| 60.240x| 0:00
8 [170] *********************************************************************
16 [137] ********************************************************
24 [ 15] *******
32 [ 2] *
40 [ 0]
48 [ 0]
56 [ 0]
64 [ 0]
-------------------------------------------------------------------------------
kbps mono % long switch short %
12.3 100.0 90.1 5.6 4.3
Writing LAME Tag...done
ReplayGain: -0.2dB