Thanks for the info Robert.
Am I right in thinking -X0 is the default?
Is there anyone testing the different -X settings on different music types.
Maybe the results of tests should be published somewhere for comparison?
John Hayward-Warburton has mentioned his preferences with -X4 & 5 in choral
music. Maybe you could try the new -X6 option John.
Ross.
Robert Hegemann wrote:
> > What does the -X parameter do exactly?
>
> When LAME searches for a "good" quantization, it has to compare
> the actual one with the best one found so far.
> The function quant_compare says which one is better, the best
> so far or the actual.
> Now the -X parameter selects between different approaches to
> make this decision:
>
> -X0 the actual is better
> if it has less distorted scalefactor bands,
> or if it's equal to the best so far
> and the sum of noise over the thresholds is less
> than the best so far
>
> -X1 the actual is better
> if the maximum noise over all scalefactor bands is less
> than the best so far
>
> -X2 the actual is better
> if the total sum of noise is lower than the best so far
>
> -X3 the actual is better
> if the total sum of noise is lower than the best so far
> and the maximum noise over all scalefactor bands
> is less than the best so far plus 2db.
>
> -X4 this is a bit complicated, I think Greg Maxwell should
> explain this ;)
>
> -X5 the actual is better
> if the sum of noise over the thresholds is less
> than the best so far
> or if they are equal
> and the total sum of noise is lower than the best so far
>
> -X6 the actual is better
> if the sum of noise over the thresholds is less
> than the best so far
> or if they are equal
> and if the maximum noise over all scalefactor bands is less
> than the best so far
> or if they are equal
> and the total sum of noise is less or equal
> the best so far
>
> All these are EXPERIMENTAL and may disappear sooner or later.
> Maybe we find the one and only criterion someday.
>
> I hope it's getting a bit clearer to you. For the details take a look
> at quantice.c, search for experimentalX.
>
>
> Robert
>
> PS: -X6 is new, I just checked it in
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