[FFmpeg-devel] Gain control not yet implemented
Tue Dec 4 17:49:25 CET 2007
On Dec 4, 2007 8:27 AM, Pascal Massimino <pascal.massimino at gmail.com> wrote:
> On Nov 29, 2007 10:16 AM, Gabriel Teixeira <gabrieldiegoteixeira at gmail.com>
> > Hi,
> > I developed a application that uses the libavcodec, but only after
> > some months of development and testing appeared a weird message that I
> > never got before:
> > [mpeg4aac @ 01290000]faac: frame decoding failed: Gain control not yet
> > implemented
> > Since the audio was encoded with ffmpeg, I believed this frame
> > wouldn't have gain control or any stuff that ffmpeg could not decode.
> > This audio stream was sent over the web via multicast, so may be a
> > fail in the information transported. Anyway, how to identify and
> > correct this problem?
> this is a bug in FAAC: scale factor differences must be in range [-60,
> but faac can generate such big differences, and then writes
> invalid huffman codes (cf huffman.c, WriteScalefactors()).
> So you end up with invalid bitstreams.
> This bug has been reported a long ago, a patch proposed, but wasn't
> committed in cvs. Now, even the web page disappeared, so i can't
> even find back the patch. I'll see if i can resurrect something on my
here you go:
i don't know why it didn't make to cvs, since bug reports for this
are to be found everywhere, under various flavors.
Now, i'm not sure the proposed patch is 100% correct, though.
> > Thanks in advance
> > Gabriel
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