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27-07-01, 07:30 PM | #1 | |
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LAME: VBR vs. ABR
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27-07-01, 07:53 PM | #2 |
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Opinions are the key here. I have wondered the same thing myself. From some of the message boards I visit it is all what you prefer. ABR and VBR are both comparable to sound the key factor is drive space. But if it is stereo separation you want 256 .. stereo CBR is the way to go. Otherwise most lame supporting encoders suggest J-stereo in VBR format ABR is rarely refered too but from the songs I have done I can not tell the difference in sound only file size.
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27-07-01, 08:43 PM | #3 |
hi
Join Date: Mar 2001
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while listening to delerium - silence .....
mazer:
abr is vbr, just a different "form" of it abr sets forward the concept of "unlimited" bit reservoir.. this means that complex pieces of music that require more bits can now be coded more accurately however, when lame 3.88 beta was released, a few people reported hearing "ringing" artifacts with popular abr settings like --abr 192, 256, etc ... from what i heard --nspsytune supposes to fix that but i haven't tried it out yet my ideal abr command line in lame 3.89 would be --abr 224 -b 160 -m j -q 0 --nspsytune --nssafejoint --lowpass 19.5 file size will be a little big but sound quality should be (in most cases) fairly solid to avoid clipping, if the peaks of the original are over -0.3db (or 97%) try adding --scale .90 to .93 to the command line besides, i'm still using cbr with both lame or producer pro, depending on me mood and whether i have patience to wait for producer pro abr is good though if you want the best sound quality vs. less disk space wasted |
29-07-01, 09:35 AM | #4 | |
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Re: while listening to delerium - silence .....
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Does CBR really have better stereo separation, even in stereo mode? Thanks schmooky, btw, Delerium - Silence is awesome. |
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30-07-01, 07:23 AM | #5 |
hi
Join Date: Mar 2001
Posts: 1,708
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both encoding modes can produce bad results if the settings do not correlate with the type of music you're trying to encode
the thing with abr is that a lot of people dont like it because it sets a specific bitrate target where the encoder does its best to keep it somewhere within that specified area. vbr with only -V doesn't. setting a maximum bitrate in vbr is obviously not recommended unless it -B 320 but u dont really need to put that in stereo separation in mp3s depends on what stereo mode u choose and that basically has to do with the bitrate. it has nothing really to do with what encoding mode u choose, but rather what is the minimum bitrate. 192kbits and below should be encoded joint stereo. 224kbits and above should be encoded stereo. u could end up with significant artifacts if u encode stereo at too low bitrates, so for example if you're using vbr and the minimum bitrate there is 128kbits, then obviously you want to use joint stereo. joint stereo is a good technique to increase audio bandwidth at lower bitrates but it becomes kinda useless at higher bitrates. the price of joint stereo is obviously loss of stereo separation and some flange with live recordings or songs with a lot of wide stereo segments, but the good thing about it is that it increases encoding efficiency and it gives better results at lower bitrates then if you would have used true stereo instead. joint stereo with higher bitrates (i.e. 256 or 320kbits) can risk introducing artifacts too because at those bitrates you should encode stereo remember whether you encode joint stereo or stereo in cbr mode, it doesn't affect file size in any way, only in vbr but even there the difference is not that big hehe enjoy delerium.. :P sorry i couldn't upload the full length its almost 12 minutes long and at 224kbits its almost 19mb |
30-07-01, 08:17 PM | #6 |
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Thanks a bunch schmooky, I always learn something new here.
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31-07-01, 11:55 PM | #7 | |
hi
Join Date: Mar 2001
Posts: 1,708
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