Layer is typically not changed, unless you specify it. For higher bit rates/better quality sound, stick to MPEG-1.
On 11/23/06, Ruckert Martin <[EMAIL PROTECTED]> wrote: > > Sorry, but No. > MPEG Version 2 (short MPEG2) specifies the Low Frequency extensions > to MPEG Version 1. MPEG2 is supperior in terms of low bitrates > and high compression, it is inferior in respect to quality. > If quality matters, use MPEG Version 1 Layer 3. > Yours > Martin Ruckert > > george steeves wrote: > > So this being so it would seem that 160kb/s MPEG2 is the best bit rate > and > > format for layer 3 as MPEG2 is superior to MPEG1?? > > > > George > > > > > > On 11/22/06, Ruckert Martin <[EMAIL PROTECTED]> wrote: > > > >>Things to keep apart: Version and Layer > >> > >>MPEG Version 1 specifies 3 Layers 1,2, and 3 > >>within Version 1 we have a restricted selection of three > >>sample rates: 32kHz, 44.1kHz or 48kHz > >>and bitrates: > >>32kBit/s to 448kBit/s for layer 1 > >>32kBit/s to 384kBit/s for layer 2 and > >>32kBit/s to 320kBit/s for layer 3 > >> > >>MPEG Version 2 introduces new > >>sample rates: 16kHz, 22.05kHz or 24kHz > >>with different bitrates: > >>32kBit/s to 256kBit/s for layer 1 > >>8kBit/s to 160kBit/s for layer 2 and 3 > >> > >>There is an extension without an ISO Standard called MPEG version 2.5 > >>again with different > >>sample rates: 8kHz, 11.025kHz or 12kHz > >>with different bitrates: > >>8kBit/s to 64kBit/s for layer 3 > >> > >>So you see: you have to switch the version, if the sample rate is > >>changing. > >>You have to switch the layer if the bitrate is changing. > >>Now to the question: > >>From the above, you see, that while encoding a version 2 stream with one > >>of the > >>version 2 sample rates in layer 2, you can use only bitrates between > 8kBit > >>and 160kBit. > >>If the bitrate has to increase beyond 160kBit, you can not switch to > MPEG > >>version 1, > >>(because the sample rate has not changed), but you must switch to layer > 1, > >>because > >>in layer 1 you can use bitrates up to 256kBit/s. > >>On the other hand you must switch back, if the bitrate is below 32kBit. > >> > >>Now which is better: typically layer 3 gives you a more compact encoding > >>therefore smaller bitrates are sufficient. So go with layer 3. The > >>version depends on the sample rate. Higher sample rates are typicaly > >>better > >>but not as compact to encode then lower sample rates. lame will > >>automatically > >>downsample in needed. leave it to lame to decide. > >> > >> > >>Yours > >> Martin Ruckert > >> > >>PS: these and other such details, you find in "Understanding MP3", > >>Springer Verlag. > >> > >>george steeves wrote: > >> > >>>mp3encoder@minnie.tuhs.org > >>> > >>> > >>> > >>> > >>> > >>>I have a question for which I can find no definitive answer. MPEG > >> > >>layer3 > >> > >>>files are in two flavors MPEG1 and MPEG2. I know this is true as the > >>>Lame_enc.dll switches from MPEG2 to MPEG1 when the bit rate is > increased > >>>beyond 160kb/s. I have read the source code and I know this is so. Is > >> > >>this > >> > >>>only true of the Lame encoder or only true of the lame_enc.dll. What > is > >> > >>the > >> > >>>difference? Which is better? Why? > >>> > >>> > >> > >> > >>-- > >>------------------------------------- > >>Prof.Dr.Martin Ruckert > >>Munich University of Applied Sciences > >>FB07 Mathematics and Computer Science > >>Lothstrasse 34 > >>D-80335 Munich > >>GERMANY > >>_______________________________________________ > >>mp3encoder mailing list > >>mp3encoder@minnie.tuhs.org > >>https://minnie.tuhs.org/mailman/listinfo/mp3encoder > >> > > > > > > > > > > > -- > ------------------------------------- > Prof.Dr.Martin Ruckert > Munich University of Applied Sciences > FB07 Mathematics and Computer Science > Lothstrasse 34 > D-80335 Munich > GERMANY > _______________________________________________ > 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
