[Ffmpeg-devel] FAAC rate control broken?

[Luca Abeni]

On Tue, 2005-12-20 at 16:49 +0100, Luca Abeni wrote:
[...]
> Reducing the faac_cfg->bandWidth value a lot (something like
> avctx->sample_rate / 8) does work...
> Any suggestion about a proper value for "bandWidth"?
Ok, after some investigation it looks like the safest thing to do is to
se "bandWidth" to 0 (leaving to libfaac the responsibility to decide a
correct value).
With the attached patch, ffmpeg is able to encode in AAC 64kbps stereo
audio at 44100Hz...

It cannot go under 60kbps because libfaac thinks that it is impossible
to encode audio at 44100Hz at less than 29500bps per channel :(
(libfaac contains a bitrate <--> bandwidth table that needs to be fixed,
but this is another story... A possible workaround would be to include a
similar table in libavcodec/faac.c and to set bandWidth to a proper
value).

Anyway, does the simples thing by leaving the "bandWidth" decision to
libfaac... Can it be applied?

				Thanks,
					Luca
-- 
_____________________________________________________________________________
Copy this in your signature, if you think it is important:
                               N O    W A R ! ! !

 
 
 --
 Email.it, the professional e-mail, gratis per te: http://www.email.it/f
 
 Sponsor:
 Regalati un telefonino TIM UMTS, avrai 500 Euro di telefonate GRATIS!
 Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=4428&d=21-12
-------------- next part --------------
A non-text attachment was scrubbed...
Name: faac.diff
Type: text/x-patch
Size: 650 bytes
Desc: not available
URL: <http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/attachments/20051221/fa686312/attachment.bin>