Re: [MP3 ENCODER] side channel starving
Segher Boessenkool a écrit : At high frequencies, humans only decide direction of the sound by the relative left/right intensity, not by phase difference. So this idea seems like the intensity stereo. In this case, why not implementing intensity stereo? Regards, -- Gabriel Bouvigne - France www.mp3-tech.org -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
Re: [MP3 ENCODER] side channel starving
Segher Boessenkool a écrit : At high frequencies, humans only decide direction of the sound by the relative left/right intensity, not by phase difference. So this idea seems like the intensity stereo. In this case, why not implementing intensity stereo? No, it's totally different :-) Intensity stereo == panned mono. Side channel starving == leaving out side channel samples that convey no useful information. Totally different :-) IS sounds horrible, is only useful at very low bitrates. But it would be nice to have it implemented, of course. Ciao, Segher -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
Re: [MP3 ENCODER] side channel starving
Hi all, Does lame implement side channel starving? If not, I'll volunteer :-) Ciao, Segher Boessenkool LAME has crude algorithm which allocates bits based on the energy contained in the side channel vs. mid channel. It definatly needs work: I have some test cases where LAME allocates too many bits to the side channel, and other test cases (like ftb_samp.wav) where it allocates too few. You could try allocating bits per sfband... sounds reasonable to me. I tried the side channel "sparsing" algorithm described in the ISO docs a long time ago, and it does not work at all. That's strange... for me, it does work. Saves about 30% of bits as well. I'll look into it tonight or something. Dagdag, Segher -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
[MP3 ENCODER] side channel starving
Hi all, Does lame implement side channel starving? If not, I'll volunteer :-) Ciao, Segher Boessenkool -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
Re: [MP3 ENCODER] side channel starving
Hi all, Does lame implement side channel starving? If not, I'll volunteer :-) Ciao, Segher Boessenkool LAME has crude algorithm which allocates bits based on the energy contained in the side channel vs. mid channel. It definatly needs work: I have some test cases where LAME allocates too many bits to the side channel, and other test cases (like ftb_samp.wav) where it allocates too few. I tried the side channel "sparsing" algorithm described in the ISO docs a long time ago, and it does not work at all. Mark -- MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
