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how to get the lower bitrates?
amppa
post Jan 12 2002, 19:46
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So, I would like to have mp3 files close to 192 kbps. I listen mostly metal (various types - heavy, power, black, ...) and --alt-preset standard seems to create mostly bitrates of 200-250 (tested with several albums). I consider this to be too high, how should I create the files to get lower rates? Should I use ABR with --alt-preset [rate] or maybe some VBR command line (for example, edited -r3mix), using -V[n] to adjust the bitrates? Any suggestions?
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mp3fan
post Mar 8 2002, 03:59
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QUOTE
like employing an adaptive lowpass, with a lower nominal cutoff, but increasing it beyond 19khz in critical moments. A more agressive adaptive ath might help here also.


These are ideas that I've heard before a long time ago, but none of the developers were able to put in the time to make it happen. IMO, the "adaptive" approach is going to put the bitrate very close to where people want it.

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On a side note, I tried this commandline based on your recommendations for lowering the bitrate:

--alt-preset standard -V3 -Y --lowpass 17.5

This resulted in a much lower file size and the quality was good IMO. If you were to try code level tunings around this approach, it might be able to deliver a fantastic bitrate/quality ratio for those who aren't concerned about ultra high frequencies. Looks like 150-195 kb/sec based on the complexity of the materiel right now and has room for improvement through tweaks.

Perhaps this could result in a preset that can satisfy high quality sound without the ultra high frequencies? Some people might consider this statement an oxymoron (i.e. "high quality/no ultra high freqs").

What I mean by "high quality without ultra high freqs" is keeping the joint-stereo improvements, low artifacts, low ringing, etc. The idea here being "the best sound possible in mp3 under 17khz" (or under 16khz which ever is necessary within the spec to achieve marvelous bitrate/quality results).

Currently --ath-lower x results in an unrecognizable error while using razorlame. Anyone know why this is?

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- amppa   how to get the lower bitrates?   Jan 12 2002, 19:46
- - tangent   I would recommend only using --lowpass (try 17.5) ...   Jan 12 2002, 20:16
- - ami   hi, hmm since ive read, that dibrom listens and en...   Jan 12 2002, 20:25
- - amppa   So, if I got it right, lame --alt-preset [rate] sh...   Jan 12 2002, 21:38
- - NeoRenegade   You got it dead on   Jan 13 2002, 23:46
- - TheBashar   I don't recall ever reading Dibrom say that with h...   Jan 14 2002, 00:56
- - Weiman   How about --alt-preset standard -V 3 -B 256? It gi...   Mar 7 2002, 21:29
- - Dibrom   My stance on this: Lowering the lowpass is by far...   Mar 7 2002, 21:57
- - mp3fan   QUOTE like employing an adaptive lowpass, with a l...   Mar 8 2002, 03:59
- - kxy   Newbie questions... when I use -alt-preset stand...   Mar 8 2002, 08:22
- - Sachankara   I still donīt see why you donīt use --alt-preset 1...   Mar 8 2002, 22:55
- - Dibrom   QUOTE Originally posted by mp3fan Currently [b]--...   Mar 8 2002, 23:42
- - kxy   Thx Dibrom. So despite the sfb21 warning, if some...   Mar 9 2002, 15:32
- - Dibrom   You don't need to use a lowpass when you use -Y. ...   Mar 9 2002, 19:10
- - kxy   Oh yea, of course I don't need to use -y and --low...   Mar 9 2002, 20:50
- - Dibrom   QUOTE Originally posted by kxy To recap, the -Y o...   Mar 9 2002, 21:03
- - mp3fan   Dibrom, QUOTE By using -Y, and disabling noise sh...   Mar 10 2002, 03:10
- - jkeating   You are forgetting about stereo settings! Right no...   Mar 12 2002, 00:04
- - Dibrom   QUOTE Originally posted by mp3fan So by using a -...   Mar 12 2002, 00:21
- - Dibrom   QUOTE Originally posted by jkeating You are forge...   Mar 12 2002, 00:24
- - ErikS   QUOTE Originally posted by Dibrom The reason fo...   Mar 12 2002, 02:28
- - JohnV   QUOTE Originally posted by ErikS No. Sorry for be...   Mar 12 2002, 03:30
- - Delirium   JohnV and Dibrom -- thanks for the explanations, I...   Mar 12 2002, 09:40
- - mithrandir   Considering that MP3s primary function is to reduc...   Mar 12 2002, 17:35
- - mp3fan   QUOTE Also, when I use an --athlower number up to ...   Mar 16 2002, 20:06
- - Dalkus   Reading through the FAQs and other threads I can...   May 4 2003, 16:30
- - SometimesWarrior   Using the -Y switch with --ap extreme carries the ...   May 5 2003, 06:36
- - Dalkus   Thanx for the reply. I'm just thinking that if...   May 5 2003, 13:30


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