Hi all, With the patch I mailed earlier today, I found out a few adjustments could be made to the compression level settings.This retuning speeds up the encoding and improves compression, while not changing anything decoding-wise.
Currently, compression settings are as follows -5, -l 8 -b 4096 -m -r 5 -A tukey(0.5) -6, -l 8 -b 4096 -m -r 6-A tukey(0.5) -7, -l 8 -b 4096 -m -e -r 6-A tukey(0.5) -8, -l 12 -b 4096 -m -e -r 6-A tukey(0.5) I suggest the following, in case my previous patch is accepted -5, -l 8 -b 4096 -m -r 5 -A tukey(0.5) -6, -l 8 -b 4096 -m -r 6-A tukey(0.5);partial_tukey(2) -7, -l 8 -b 4096 -m -r 6-A tukey(0.5);partial_tukey(2);punchout_tukey(3) -8, -l 12 -b 4096 -m -r 6-A tukey(0.5);partial_tukey(2);punchout_tukey(3) See this graph for comparison: http://www.audiograaf.nl/misc_stuff/setting-visualisation.pdf This data was acquired with a reasonably large dataset (one track from each album with which the comparison on http://xiph.org/flac/comparison.html was made, so 43 tracks from 43 different CDs), which I think is quite nicely balanced. It looks like -6 will be almost as good as -8 is now, but much faster. -7 will be a bit slower and -8 will be a bit faster, but both will compress beter than -8 does now. I dropped -e because it's compression improvement isn't worth the slowdown, but it is easy for the user to add this anyway. Would this be a good idea? Any comments? _______________________________________________ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev
