Regarding "--adapt-thres-type" and "--adapt-thres-level", there is an old message describing the functions you mentioned:
http://www.mail-archive.com/[email protected]/msg02484.html Since that message was written, some things have changed. While the option "--adapt-thres-type" still primarily selects the loudness approximation routine used to compute adaptive threshold compensation, "--adapt-thres-type 2" became default in LAME 3.89b. Instead of the flat loudness approximation used in 3.88b (still available with "--adapt-thres-type 1"), an equal loudness curve is now used to compute the loudness. The only trouble that has been reported with the now default "--adapt-thres-type 2" was a limited maximum adjustment range, but that has been fixed in the LAME 3.90 alpha in the CVS repository since late July. Note too that "--adapt-thres-type 0" disables the adaptive adjustment, and only yields a lower VBR bit rate for encodings where auto-adjustment would normally be active. A better compromise to cut bits might use "--adapt-thres-level" with negative values, keeping the adaptive threshold adjustment inactive for all but the audio that needs it the most. I have not heard from anyone who claimed a benefit by using a positive number with "--adapt-thres-level" since LAME 3.89beta. If there is a benefit with positive "--adapt-thres-level" values, it will likely be found in combination with a more aggressive ATH curve like "--athtype 3". Note that the internal default offset for "--adapt-thres-level" is primarily tuned for combination with the default "--adapt-thres-type 2", and should include just enough margin to cover "--athtype 3". The internal default level probably has roughly 1 dB of margin when used with "--athtype 2". Again, this margin can be cut by using "--adapt-thres-level" with negative values. I really should insert a somewhat meaningful tidbit for "--adapt-thres-level" into LAME's --longhelp, Ironically, this task has been lingering on my backlogged TO-DO list for some time. That's my lame excuse anyway. (Oh no! Did I just make a bad pun? Somebody shoot me with a water pistol until I stop this drivel!) BTW, LAME 3.90 has been at alpha7 since mid-August. Hopefully, we are still making progress... Kind regards, - John jp wrote: > > Hello John > > I tested the new fonction --adapt-thres-type (n) > I use version alpha7, sep 29 2001 with win 95 osr2 > and very little describe for this new fonction! > So i trying in use, but i not see one 'hear <>' > This is a 'next' fonction not implemented ? > (I have make one error in use ?) > I testing in VBR-New format in Q0 and v4 > I see so one associed (?) fonction not described > named --adapt-thres-level but here 'nothing' with use > the longhelp?? _______________________________________________ mp3encoder mailing list [EMAIL PROTECTED] http://minnie.tuhs.org/mailman/listinfo/mp3encoder
