40.964.828 bytes 16-bit Stereo 44100Hz WAV 3:52 "La cosecha de mujeres"
FLAKE 0.4
Level | Ratio | Bitrate | Time
0 | 0.788 | 1112.6 kbps | 6.484
1 | 0.747 | 1054.7 kbps | 7.328
2 | 0.741 | 1045.1 kbps | 7.250
3 | 0.733 | 1034.5 kbps | 7.468
4 | 0.729 | 1029.2 kbps | 7.500
5 | 0.726 | 1024.1 kbps | 7.906
6 | 0.721 | 1017.5 kbps | 11.250
7 | 0.721 | 1017.5 kbps | 12.718
8 | 0.719 | 1015.0 kbps | 14.343
9 | 0.719 | 1014.8 kbps | 29.046
10 | 0.719 | 1015.2 kbps | 20.671
11 | 0.719 | 1014.3 kbps | 120.562
12 | 0.720 | 1016.7 kbps | 21.093
13 | 0.720 | 1016.1 kbps | 119.875
14 | 0.722 | 1019.5 kbps | 21.703
15 | 0.722 | 1019.1 kbps | 120.828
FLAC 1.1.2 CVS
Level | Ratio | Time
0 | 0,782 | 2.687
1 | 0,778 | 2.890
2 | 0,776 | 3.609
3 | 0,731 | 3.750
4 | 0,723 | 4.812
5 | 0,722 | 6.031
6 | 0,722 | 6.625
7 | 0,721 | 21.531
8 | 0,720 | 28.140
[/font]
In some samples a large block size can reduce the compression ratio.
WAV 111.266.108 bytes 16-bit Stereo 44100Hz 10:30 "La navidad de los pobres"
Parameters | Ratio | Bitrate | Bytes | Time
FLAKE -8 -b 1152 | 0.645 | 909.7 kbps | 71722600 | 39.640
FLAKE -8 -b 2048 | 0.642 | 906.0 kbps | 71436942 | 40.031
FLAKE -8 -b 2304 | 0.642 | 906.2 kbps | 71446745 | 39.656
FLAKE -8 -b 4096 | 0.644 | 909.3 kbps | 71697454 | 39.609
FLAKE -8 -b 4608 | 0.645 | 910.6 kbps | 71796426 | 38.843
FLAKE -8 -b 8192 | 0.652 | 920.1 kbps | 72549094 | 37.812
FLAC CVS -8 | 0.647 | ~913 kbps | 71971927 | 78.421
[/font]
I suggest testing several block sizes in the high levels, using a lower compression level. Then use the best value to compress the sample:
Example:
-b x,[n]
-b x Block size [16 - 65535] (default: 4608)
-b 1 Try -b 2048 and -b 4608
-b 2 Try -b 2048, -b 2304, -b 4096, -b 4608 and -b 8192.
-b 3 Try -b 192, -b 576, -b 1152, -b 2304, -b 4608, -b 256, -b 512, -b 1024, -b 2048, -b 4096, -b 8192 and -b 16384.
n Use compression level n for the tries. Default: 5 for -b 1, -b 2 or -b 3.
Compression Levels:
[1-9] Without changes
10 = -l 12 -o 4 -s 2 -b 1,5 Estimated Time: ~ 45 (2* level 5 + level 9)
11 = -l 12 -o 4 -s 2 -b 2,5 Estimated Time: ~ 69 (5*5+9)
12 = -l 32 -o 4 -s 2 -b 2,5 Estimated Time: ~ 160 (5*5+11)
13 = -l 32 -o 4 -s 2 -b 3,5 Estimated Time: ~ 215 (12*5+11)
14 = -l 32 -o 4 -s 2 -b 3,8 Estimated Time: ~ 293 (12*8+11)
All Times are Process Time (Timer 3.01). Celeron D325 2.53 Ghz under Windows XP SP2.
Estimates times are based on the first sample ("La cosecha de mujeres").[/font]