I understand the problems that can occur when applying a lossy compression technique twice - however this is a requirement of the project that I am working on.
The point of standardising all our MP3s to 128kbps 44.1khz joint stereo is that we can then simply concatenate them together to create an MP3 stream. I am unsure what we would officially need to do according to the MP3 specifications, but experimentation with some important (for our project) MP3 players like iTunes has shown us that all of these parameters need to be the same before the concatenation is successfully played. Besides this reason, I just think that the lame command line interface ought to do what it's asked, or report an error. If I tell it to encode as joint stereo and it encodes as mono, I would consider that a bug. John tech list wrote: > Fix may be valid, but what exactly does it serve? There cannot be any > improvement in quality, rather it may detiriorate (due to re-encoding). If > you > want to change a mono file to stereo - maybe to create a pseudo-stereo > effect, use the decoded output, and duplicate it into left & right channels. > > On 5/13/06, Robert Hegemann <[EMAIL PROTECTED]> wrote: > >>Am Donnerstag, 11. Mai 2006 10:56 schrieb John Snelson: >> >>>I'm trying to change a variety of MP3s into a standard 128kbps 44.1khz >>>joint stereo MP3. Most of this works great with the Lame command line >>>front end - unless the input MP3 is already mono. In that case, Lame >>>chooses to output a mono MP3, even if I explicitly specify a "-m j" >> >>option. >> >>1. transcoding from mp3 to mp3 isn't a good idea, take the original PCM >>files >>2. there is no sense in encoding mono files as joint stereo, but with one >> exception: working around a buggy mp3 device >> >> >>Ciao Robert >>_______________________________________________ >>mp3encoder mailing list >>mp3encoder@minnie.tuhs.org >>https://minnie.tuhs.org/mailman/listinfo/mp3encoder >> > > _______________________________________________ > mp3encoder mailing list > mp3encoder@minnie.tuhs.org > https://minnie.tuhs.org/mailman/listinfo/mp3encoder -- John Snelson, XML Consultant +44-1865-811184 Parthenon Computing Ltd http://blog.parthcomp.com/dbxml _______________________________________________ mp3encoder mailing list mp3encoder@minnie.tuhs.org https://minnie.tuhs.org/mailman/listinfo/mp3encoder
