I have a historic recording (1962, Spoken words) with nearly no useful
signal above 11 kHz. So I tried to code it with 22.05 kHz and 44.1 kHz.
The file with 44.1 kHz is much smaller than the file with 22.05 kHz.
Is this right? The difference is +42% for the 22.05 kHz file.
The most often used frame size is 80 kbps for 44.1 kHz and 160 kbps for the
22.05 kHz file.
-------------------------------------------------------------------------------
$ ~pfk/lame/lame -mm --cwlimit 11.025 -V1 track04.cdda.wav /dev/null
LAME version 3.86 (www.sulaco.org/mp3)
Autoconverting from stereo to mono. Setting encoding to mono mode.
Encoding track04.cdda.wav => /dev/null
Encoding as 44.1 kHz VBR(q=1) single-ch MPEG1 LayerIII ( 6.0x estimated) qval=2
Frame | CPU time/estim | REAL time/estim | play/CPU | remain
8802/8802 (100%)| 4:48/ 4:48| 5:12/ 5:12| 0.7959x| 0:00
32 [ ]
40 [ ]
48 [ ]
56 [ 0%]*
64 [12%]************
80 [49%]**************************************************
96 [21%]**********************
112 [13%]**************
128 [ 4%]*****
160 [ 1%]*
192 [ 0%]*
224 [ 0%]*
256 [ 0%]*
320 [ ]
average: 88.6 kbps
-------------------------------------------------------------------------------
$ ~pfk/lame/lame -mm --cwlimit 11.025 --resample 22.05 --lowpass 11.024 -V1
track04.cdda.wav /dev/null
LAME version 3.86 (www.sulaco.org/mp3)
Autoconverting from stereo to mono. Setting encoding to mono mode.
Resampling: input=44.1kHz output=22.0kHz
Using polyphase lowpass filter, transition band: 10758 Hz - 11025 Hz
Encoding track04.cdda.wav => /dev/null
Encoding as 22.1 kHz VBR(q=1) single-ch MPEG2 LayerIII ( 6.0x estimated) qval=2
Frame | CPU time/estim | REAL time/estim | play/CPU | remain
8802/8802 (100%)| 1:24/ 1:24| 1:25/ 1:25| 2.7368x| 0:00
8 [ ]
16 [ ]
24 [ ]
32 [ ]
40 [ ]
48 [ 0%]*
56 [ 1%]***
64 [ 5%]*********
80 [14%]***********************
96 [10%]*****************
112 [ 9%]***************
128 [ 8%]*************
144 [22%]*************************************
160 [30%]**************************************************
average: 125.7 kbps
-------------------------------------------------------------------------------
--
Mit freundlichen Grüßen
Frank Klemm
eMail | [EMAIL PROTECTED] home: [EMAIL PROTECTED]
phone | +49 (3641) 64-2721 home: +49 (3641) 390545
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