Re: short block count1 region(Re: [MP3 ENCODER] problems with HQ mode in latest CVS)

[Robert Hegemann]

Mark Taylor schrieb am Mon, 03 Apr 2000:
<snip>
> I've noticed there are some MPEG2.5 problems at 8kbs,
> but are you sure this is the problem?  setting the
> extra bits added for short blocks (currently 500) to zero
> doesn't help for me.
<snip> 
> Mark

No Mark, I'm not sure that it is the cause. The other
potential risk is the adding based on pe:

    /* extra bits based on PE > 700 */
    add_bits[ch]=(pe[gr][ch]-750)/1.55;  /* 1.4; */
    
    /* short blocks need extra, no matter what the pe */
    if (cod_info->block_type==SHORT_TYPE) 
      if (add_bits[ch]<500) add_bits[ch]=500;
    
These are all tuned for 44.1 kHz (~128 Kbits) streams
and do a good job there, but it may not work anymore 
with MPEG2(.5) at really low  bitrates (8-40 kbits).
We maybe have to adapt these to the needs of the low rates.

Robert
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