[MP3 ENCODER] Digital downsampling of mp3s?
Hello 'lamers', Like many people on this list (I imagine) I have a fairly substantial collection of good quality (-v --preset studio) MP3s encoded with lame. I'd love to be able to be able to make them smaller to squash more musiconto my portable MP3 player. Is it possible to have lame digitally resample an mp3 on a frame-by-frame basis? Although granted, the quality wouldn't be as good as a 'slow' encoding, I'd imagine this could be extremely fast! Stephen. -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
RE: [MP3 ENCODER] Digital downsampling of mp3s?
From: Stephen Kennedy [mailto:[EMAIL PROTECTED]] Is it possible to have lame digitally resample an mp3 on a frame-by-frame basis? Although granted, the quality wouldn't be as good as a 'slow' encoding, I'd imagine this could be extremely fast! Hmmm, I doubt it. The psychoacoustic model needs the original signal in (at least) FFT form. I don't think MDCT - FFT can be done directly, so you'd need to go MDCT - time domain - FFT, i.e. full decode followed by FFT. You probably wouldn't gain any speed at all. I suppose you could disable the psymodel, but at low bitrates that's a recipe for terrible quality... -- Mat. -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
Re: [MP3 ENCODER] Digital downsampling of mp3s?
| Like many people on this list (I imagine) I have a fairly substantial | collection | of good quality (-v --preset studio) MP3s encoded with lame. I'd love to be | able to be able to make them smaller to squash more musiconto my portable | MP3 player. | | Is it possible to have lame digitally resample an mp3 on a frame-by-frame | basis? Although granted, the quality wouldn't be as good as a 'slow' | encoding, | I'd imagine this could be extremely fast! no way here :-( It should be maybe possible in wavelet transform, but not in discrete cosinus. You should wait for wavelet encoder and decoder... Or you should use ;-)) lame --decode x.mp3 - | mp3enc31 -sti -of x.small.mp3 -esr 22050 -qual 9 -bw 11025 -br 64000 (ech... commercialcrippleware, 30 sec limit - but you can cut wav and glue mp3s :-)) (with very small tick each 30s)... BTW, Im not try this "cutting" under linux, should kill -HUP pid after each (say) 28sec help? will sounds much better than lame -h -m j -b 64 --voice --noshort --resample 22.05 --lowpass 11.025 --lowpass-width 0 --mp3input x.mp3 x.small.mp3 Note that --voice options sounds better with bitrates = 64k. You can test options like --cwlimit (default is cca 8, yoiu can test it from 0 to 11.025). Regards Jaroslav Lukesh, K-net -- http://www.k-net.cz Multimedia, Networking, Communications Windows terminals, NC computer hardware and software -- note: (Bill) Gates to Hell! -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
Re: [MP3 ENCODER] Digital downsampling of mp3s?
Jaroslav Lukesh schrieb am Die, 22 Aug 2000: lame -h -m j -b 64 --voice --noshort --resample 22.05 --lowpass 11.025 --lowpass-width 0 --mp3input x.mp3 x.small.mp3 why not lame --preset fm -h -k x.mp3 x.small.mp3 ??? but I would not use -k there. Note that --voice options sounds better with bitrates = 64k. mainly because the short block detection isn't tuned for LSFs. Ciao Robert -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
