[Lame-dev] Re: stereo audio compression quality

[Robert H. <Rob...@gm...>]

Hi Gregory,

did you make sure that the ripped waves did not have the pops already?
What tool do you use for ripping audio CDs ?

Ciao Robert
 

Am Donnerstag, 3. Januar 2002 19:15 schrieben Sie:
> Hello..
>
> I have been running experiments encoding 44khz PCM stereo .wav files into
> MP3's.
>
> have used the following encoders:  Blade_dll, and  Lame_dll.
>
>
> Question:
>
> Process runs smoothly except there are numerous low level pops, thumps, and
> other discontinuous sounds on playback.  What is the cause of these
> discontinuities?
>
>       a)  encoding algorithm
>
>       b)  playback hardware, i.e. soundboard, IRQ conflict, etc.
>
>
>
> Typical data:
>
> Input file:   24118 KB .wav  stereo
>
> 256kbps   Blade 0.94     5.5x     0:32 sec     4376 KB     Playback: 256k
> 256kbps   Blade 0.91     5.5x     1:26 sec     4376 KB      256k
>
> 256k hi    Lame 3.90     5.5x     0:31 sec     4378 KB       256k
>
> 128k hi    Lame ABR    11.0x    0:35 sec     2184 KB       127k ave
> 160k hi    Lame ABR     8.8x     0:33 sec     2734 KB       159k ave
> 192k hi    Lame ABR     7.4x     0:32 sec     3278 KB       191k ave
>
> 2-new hi  Lame VBR      8.0x     0:31 sec     3001 KB       175k ave
> 1-new hi  Lame VBR      7.7x     0:32 sec     3135 KB       183k ave
> 0-new hi  Lame VBR      7.2x     0:32 sec     3366 KB       196k ave
>
> 0-old hi    Lame VBR      7.4x     1:09 sec     3263 KB       190k ave