Hi all,
I've found a small sound segment that produces very unpleasant artifacts
with LAME's VBR mode. The VBR improvements added in 3.26 (#define RH)
seem to make it worse. The sample is very rich in loud "s" sounds, which
apparenty cause ringing artifacts. These disappear only if a minimum
bitrate of 160kbps or higher is imposed, in both joint/ms and full
stereo. The sample is only about 3 sec long (687,892 bytes); is anyone
interested in me uploading it somewhere, and if so, where?
Also, I'd like to add support to LAME to allow the user to specify a
mean (average) bitrate, and am wondering about the best way to go about
this. The simplest way would appear to be to output the bitrate/quality
data to a file in a first pass (without performing a full encode), and
then run a second pass to generate a "bitrate profile", which could then
be read in for the third, encoding pass. Does this sound reasonable?
Perhaps a general way to specify bitrate on a frame-by-frame basis would
be useful anyway (e.g. for manually assisted VBR encoding)...
TIA,
-- Mat.
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