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best mp3 preset and settings for 128 kbps CBR
m3gab0y
post Jun 5 2011, 22:08
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Hey guys, maybe it's discussed before (I found only the threat from 2003), and sorry if i'm posting duplicate.

I have a radiostation that obviously has output frequency responce of 30 hz up to 16 khz, with brickwall filters, and some other fancy equipment.... smile.gif
I want to steam this station at 128 kbps and achieve the best possible quality of a CBR 128 KBPS mp3 encoder. Did I mention that the input material is 99.9% lossless audio? cool.gif

I currently use edcast with Lame 3.93.1 using preset=12 and quality=0 and I'm getting decent results. But I hear lots of dirrerence between the original output and the stream. Am I doing something wrong? And is there better way to squeze more out of the mp3 codec?

This post has been edited by m3gab0y: Jun 5 2011, 22:53
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2Bdecided
post Jun 7 2011, 18:02
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ReplayGain developer


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You can use ABR with a hard bandwidth cap - but worst case that's as bandwidth hungry as CBR at the bandwidth cap. If that worst case is acceptable in bandwidth terms, you might as well use CBR at that bandwidth cap!

The advantage of ABR or VBR in this case is that it can save you a little bandwidth/money, but not increase quality.

You could manage peak and average bitrates over timescales which equate to typical buffers, giving you a potentially useful quality increase (compared with CBR) within the same overall bandwidth constraints. However, unless I'm mistaken, lame doesn't give you this kind of control, does it?

You could say that you don't care, and that overall VBR will still work well enough overall - but then you will get users whose feed drops out when the bitrate goes up. That's far worse than an occasional encoding artefact.

Cheers,
David.
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Posts in this topic
- m3gab0y   best mp3 preset and settings for 128 kbps CBR   Jun 5 2011, 22:08
- - dv1989   Get a version of LAME that was released more recen...   Jun 5 2011, 22:39
- - pdq   Try ABR, or even a VBR setting that gives about th...   Jun 6 2011, 03:03
|- - Satellite_6   QUOTE (pdq @ Jun 5 2011, 22:03) Try ABR, ...   Jun 6 2011, 06:49
- - Martel   Streaming does not HAVE TO use CBR. It's just ...   Jun 6 2011, 18:51
- - 2Bdecided   You can use ABR with a hard bandwidth cap - but wo...   Jun 7 2011, 18:02
- - benski   Most streaming server services charge for bandwidt...   Jun 7 2011, 18:29
- - C.R.Helmrich   For clarification, since many seem to be misunders...   Jun 7 2011, 20:49
- - 2Bdecided   Yes, but the mp3 CBR bitrate reservoir isn't r...   Jun 8 2011, 10:32
- - DonP   You could stream Vorbis and buy some more bandwidt...   Jun 8 2011, 11:09
- - m3gab0y   Hey guys. Thanks for the replies. I've expecte...   Jun 9 2011, 14:50
|- - dv1989   QUOTE (m3gab0y @ Jun 9 2011, 14:50) QUOTE...   Jun 9 2011, 15:26
||- - IgorC   QUOTE (dv1989 @ Jun 9 2011, 11:26) Basic ...   Jun 9 2011, 17:14
|- - lvqcl   QUOTE (m3gab0y @ Jun 9 2011, 17:50) As I...   Jun 9 2011, 16:05
|- - C.R.Helmrich   QUOTE (m3gab0y @ Jun 9 2011, 15:50) I don...   Jun 9 2011, 18:13
- - DonP   Some stations offer multiple formats: a choice of...   Jun 9 2011, 15:43
- - rexit2   I have been using the ABR128 preset with LAME 3.98...   Jun 9 2011, 15:56
|- - dv1989   QUOTE (rexit2 @ Jun 9 2011, 15:56) AAC+ d...   Jun 9 2011, 16:17
- - chencho   I am streaming at 128 kbps mp3 CBR using newest l...   Jun 9 2011, 16:52
- - m3gab0y   QUOTE (DonP @ Jun 9 2011, 17:43) Some sta...   Jun 9 2011, 19:32
|- - pdq   QUOTE (m3gab0y @ Jun 9 2011, 14:32) btw. ...   Jun 9 2011, 20:03
||- - C.R.Helmrich   QUOTE (pdq @ Jun 9 2011, 21:03) As I unde...   Jun 9 2011, 23:01
|- - 2Bdecided   QUOTE (m3gab0y @ Jun 9 2011, 19:32) I use...   Jun 10 2011, 11:34
- - dv1989   96 kHz? Why? Wait: 256 kbps and 96 kHz in AAC+ v2...   Jun 9 2011, 20:04
- - m3gab0y   QUOTE (DonP @ Jun 9 2011, 17:43) Some sta...   Jun 9 2011, 20:12
- - lvqcl   According to Winamp, it's MPEG-2 HE-AAC (aka A...   Jun 9 2011, 20:42
- - Rio   you can try FhG ACM for your 128 CBR   Jun 10 2011, 05:50
- - m3gab0y   QUOTE (C.R.Helmrich @ Jun 10 2011, 01:01)...   Jun 10 2011, 07:29
|- - Rio   well, lame 3.93.1 is a favorite over newer version...   Jun 10 2011, 08:24
|- - 2Bdecided   QUOTE (m3gab0y @ Jun 10 2011, 07:29) HE-A...   Jun 10 2011, 11:21
|- - DonP   QUOTE (m3gab0y @ Jun 10 2011, 01:29) And ...   Jun 10 2011, 12:33
- - m3gab0y   QUOTE (Rio @ Jun 10 2011, 10:24) well, la...   Jun 10 2011, 10:33
|- - pdq   QUOTE (m3gab0y @ Jun 10 2011, 05:33) I us...   Jun 10 2011, 13:44
- - m3gab0y   QUOTE (2Bdecided @ Jun 10 2011, 13:21) QU...   Jun 10 2011, 14:11
- - dv1989   -h simply maps to a given -q value (unsure which),...   Jun 10 2011, 14:28
- - Rio   well -h is equivalent to -q0, but if you go with -...   Jun 10 2011, 14:57
- - dv1989   -q0, in CBR? Last I knew, it was equal to -q3 and ...   Jun 10 2011, 15:02
- - pdq   For years there has been all of this confusion abo...   Jun 10 2011, 15:25
- - mixminus1   -h has always mapped to -q 2 since at least 3.90.3...   Jun 10 2011, 15:27
- - m3gab0y   QUOTE (mixminus1 @ Jun 10 2011, 17:27) -h...   Jun 10 2011, 16:19
|- - pdq   QUOTE (m3gab0y @ Jun 10 2011, 11:19) I wi...   Jun 10 2011, 16:50
- - m3gab0y   QUOTE (pdq @ Jun 10 2011, 18:50) What fro...   Jun 10 2011, 17:13
- - pdq   You need to check your edcast documentation then t...   Jun 10 2011, 17:28
- - mixminus1   *Now* I remember what this was about: "prese...   Jun 10 2011, 17:31
- - Rio   oh my, i meant -h equals -q2   Jun 11 2011, 02:56


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