Re: [MP3 ENCODER] Quality problem reencoding
On Wed, 13 Nov 2002, Haas Wernfried wrote: maybe you could switch to ogg vorbis, it is designed to be able to peel a stream, which means reducing bitrate without reencoding, but afaik the tools for peeling are quite experimental / not available for the public yet. if you already have mp3s and not the original wav files, ogg would not help you anyway, as reencoding mp3 to ogg is a very bad idea, too. hope no one's annoyed because im advertising ogg here, i personally like both lame/mp3 and ogg vorbis. Switching to ogg vorbis isn't a solution. The problem is within lame. I can use these files on a windows machine and not have the artifacts. I can use toolame and not have the artifacts. The problem with using either is that 1) this is a unix installation, 2) toolame's lowpass filter isn't controllable and doesn't sound that great and 3) I'd have to incorporate toolame into this heavily modified version of ices whereas lame already is. The artifacts also show up on live broadcasts so there's no mp3-mp3 conversion even going on. Once again here's the original problem: I have a number of files created with lame 3.92 using the --r3mix preset. They all sound great. The problem is when I reencode them down for streaming. It doesn't matter if I reencode on the fly or reencode first. The effect reminds me of a phase shifter commonly used on a guitar. You can actually hear it here with winamp, xmms or whatever you like here: http://caroline.pop4.net:8004 The stream is 56k @ 44.1KHz - which should sound good. ... The OS is FreeBSD v4.7 and I've tried installing lame from both the straight sources and from FreeBSD's ports. No difference. Vince. -- http://www.meanstreamradio.com http://www.unknown-artists.com Internet radio: It's not file sharing, it's just radio. ___ mp3encoder mailing list [EMAIL PROTECTED] http://minnie.tuhs.org/mailman/listinfo/mp3encoder
Re: [MP3 ENCODER] Quality problem reencoding
I have a number of files created with lame 3.92 using the --r3mix preset. They all sound great. The problem is when I reencode them down for streaming. It doesn't matter if I reencode on the fly or reencode first. The effect reminds me of a phase shifter commonly used on a guitar. You can actually hear it here with winamp, xmms or whatever you like here: http://caroline.pop4.net:8004 The stream is 56k @ 44.1KHz - which should sound good. ... I listened to the file, and what I hear is typical of very high mp3 compression. This might be coming from the fact that you are forcing output to 44.1kHz. At 56kbps there are not enough bits available to preserve full bandwith. You have to accept some compromise, that is trading some bandwidth against artefacts. I would suggest you to try lame --alt-preset cbr 56. Listen to the result, it is very likely to be way better... Regards, Gabriel Bouvigne www.mp3-tech.org personal page: http://gabriel.mp3-tech.org ___ mp3encoder mailing list [EMAIL PROTECTED] http://minnie.tuhs.org/mailman/listinfo/mp3encoder
Re: [MP3 ENCODER] Quality problem reencoding
hi, there's a recent thread about reencoding mp3, you can find it in the archives at: http://minnie.tuhs.org/pipermail/mp3encoder/2002-August/005028.html to sum it up in short terms: reencoding is generally not a very good idea. maybe you could switch to ogg vorbis, it is designed to be able to peel a stream, which means reducing bitrate without reencoding, but afaik the tools for peeling are quite experimental / not available for the public yet. if you already have mp3s and not the original wav files, ogg would not help you anyway, as reencoding mp3 to ogg is a very bad idea, too. hope no one's annoyed because im advertising ogg here, i personally like both lame/mp3 and ogg vorbis. regards, wernfried On Wed, Nov 13, 2002 at 09:22:45AM -0500, User BS wrote: I have a number of files created with lame 3.92 using the --r3mix preset. They all sound great. The problem is when I reencode them down for streaming. It doesn't matter if I reencode on the fly or reencode first. The effect reminds me of a phase shifter commonly used on a guitar. You can actually hear it here with winamp, xmms or whatever you like here: http://caroline.pop4.net:8004 The stream is 56k @ 44.1KHz - which should sound good. ... -- - Fppmpppffpppmpfpffmffmppmpm Mfpmmfmm - [EMAIL PROTECTED] - mfpfmpfmppfm://fpfppffpmmpppff.ppmfmfmpm.mmmfmp/~mmmppmpppmpmffppfppp - http://www.namesuppressed.com/kenny/ ___ mp3encoder mailing list [EMAIL PROTECTED] http://minnie.tuhs.org/mailman/listinfo/mp3encoder
