[linux-audio-user] ogg confusion

[Pete Harlow]

 From man oggenc:

<quote>
--managed
Set bitrate management mode.  This  turns  off  the  normal  VBR 
    encoding,  but  allows  hard  or  soft bitrate constraints to be
enforced by the encoder. This mode is much slower, and may  also
be  lower quality. It is primarily useful for creating files for
streaming.


Specifying a maximum and average bitrate, and enforcing these.
oggenc infile.wav --managed -b 128 -M 160 out.ogg
</quote>

Regards,

Pete.


Robert Jonsson wrote:
> On Tuesday 06 July 2004 14.35, Jan Depner wrote:
> 
>>That sets the nominal bitrate.  What you are seeing is the actual
>>bitrate for sections that don't need to be encoded at 128.  In other
>>places it will go above 128.  Play your .ogg on xmms and watch the
>>bitrate display.  I don't use the -b switch when I encode.  I normally
>>just use -q 5.
>>
>>Jan
>>
>>On Tue, 2004-07-06 at 04:19, Atte André Jensen wrote:
>>
>>>I'm trying out oggenc under linux/unstable, but I'm confused! Using
>>>"oggenc -b 128" ends with a file with bitrate around 60-70 acording the
>>>the report printed by oggenc...
> 
> 
> If I remember correctly vorbis does not have a constant bitrate option. The -b 
> is probably used only for "hinting" at which bitrate you wish to have. It 
> could very well be as Jan suggests, it will get higher after a while, or it's 
> simply a bug. 
> Anyway you are probably better of using the -q switch.
> 
> For your information. Testing done lately 
> http://www.rjamorim.com/test/multiformat128/results.html
> suggests that the alternative vorbis encoder 
> http://www.geocities.jp/aoyoume/aotuv/ gives superior quality (to the 
> standard encoder, and pretty much anything else).
> 
> /Robert
> 

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