[Ffmpeg-devel] aac adts input

Michael Niedermayer michaelni
Thu Aug 11 10:38:15 CEST 2005


On Wed, Aug 10, 2005 at 11:15:43PM -0400, Justin Ruggles wrote:
> Benjamin Larsson wrote:
> > Also to be taken into consideration is if the file is using SBR, eg
> > doubbling the  frequency. I would guess this is the case here.
> some insightful comments from libfaad2/mp4.c:
> /* no SBR signalled, this could mean either implicit signalling or no
> SBR in this file */
> /* MPEG specification states: assume SBR on files with samplerate <=
> 24000 Hz */
> Now it all makes more sense.  Here is a much simpler patch.

if i understand this correctly the patch practically discards the high
frequency information for some SBR files? if thats true then the patch
is rejected



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