"Linda A. Walsh" <[email protected]> wrote: > what does the exhaustive model search do?
I am not an expert on the guts of FLAC, but there is some information about this at: http://flac.sourceforge.net/documentation_format_overview.html and scroll down to "MODELING". > Does it try all of the functions listed under "-A" to find the 'best', > i.e. bartlett, bartlett_hann, blackman, blackman_har- > ris_4term_92db, connes, flattop, gauss(STDDEV), hamming, hann, > kaiser_bessel, nuttall, rectangle, triangle, tukey(P), welch. > > Or is that something else? That is something else. > I've been using the -e option for a while in my flac encoding, > but for something that sounds like it should be slow I wonder > if it is testing all the models or if it might not be > working correctly? At: http://flac.sourceforge.net/documentation_tools_flac.html#flac_options_exhaustive_model_search it states, "If the max LPC order is high this can significantly increase the encode time." This suggest that if the max LPC order is low then using -e will not be slow. The max LPC order is set explicitly using the -l option or, more usually, by setting a compression level. Compression levels are described at: http://flac.sourceforge.net/documentation_tools_flac.html#flac_options_level_0 Note that compression levels 7 and 8 also set the -e option. I have not attempted to explain what the LPC order actually is because I do not understand it well enough Regards, Martin. -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/ _______________________________________________ Flac mailing list [email protected] http://lists.xiph.org/mailman/listinfo/flac
