Here is today's idea:
A change in pe is an indicator of a change in the ammount of bits needed
(verified with mp3x).
So we could use for the bitrate to try first:
old_pe=old_pe1+old_pe2;
new_pe=pe1+pe2;
if (abs(old_pe - new_pe)>100){
if (old_pe>new_pe)
bitrate_index=old_bitrate-1;
else
bitrate_index=old_bitrate+1;
} else
bitrate_index=old_bitrate;
and for the final choice:
while (over!=vbr_q){
if (over>vbr_q)
bitrate++;
if (over<vbr_q) /*another speedup possible here*/
bitrate--;
quantize processing
}
a speedup is possible in this loop, but would sligtly increase the file
size:
if (over<vbr_q){
do not try lower bitrate for this frame, but try lower start bitrate for
the next frame
}
I think those changes could be able to speed up the vbr encoding
Gabriel Bouvigne - France
[EMAIL PROTECTED]
icq: 12138873
MP3' Tech: www.mp3tech.org
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