Mark Taylor schrieb am Die, 26 Sep 2000:
> > Hi all,
> >
> > I now have free format working in my decoder, MAD. If anyone would like to try
> > it -- get version 0.11.4b or later:
> >
> > ftp://ftp.mars.org/pub/mpeg/
Thanks Rob, great!
> > So far it seems to work with any free format bitrate I've created with LAME,
> > all the way up to 640 kbps.
Cool
> > The real reason I'm writing, though, is I think I've discovered some problems
> > with LAME's free format encoder. :-)
> >
> > First: Using --freeformat -b X --mp3input, the output bitrate is not X, but
> > the bitrate of the input file. LAME will even generate free format VBR, which
> > is forbidden, if the input file is VBR.
> >
> Thanks! this should be fixed now.
another thing that does not work:
lame -b640 --freeformat -g fatboy.wav fatboy.mp3
fatal error. MAXFRAMESIZE not large enough.
in mpg123.h MAXFRAMESIZE is defined as 1792, but a 32 kHz 640 kps MP3
consists of 2880 bytes per frame (2090 at 44.1 kHz, 1920 at 48 kHz).
Changing this seems to trigger another BUG somewhere:
LAME stops with: Only 8 and 16 bit input files supported ????
1792*8 = 14336 bits,
1920*8 = 15360 bits,
2090*8 = 16720 bits, more than 32767/2, reason for BUG?
2880*8 = 23040 bits, more than 32767/2, reason for BUG?
I haven't looked deeper at this, I had no time yet :-(.
> > Second: With some (usually high) bitrates, LAME seems to mangle the bitstream.
> > The effect is usually to hear short bursts of garbage in the left channel, but
> > it seems to depend on the input file as well as the bitrate. Not all frames
> > are affected.
Rob, can you provide us with a short example track?
> I'm not surprised, considering you are probably only the 3rd
> person to ever use freeformat :-)
first is Mark, who is the second person?
> Mark
Ciao Robert
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