[Ffmpeg-devel] aac adts input

Justin Ruggles jruggle
Thu Aug 11 17:46:28 CEST 2005

Michael Niedermayer wrote:
> 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

Yes.  For files that intend SBR to be used implicitly due to the fact
that they're 24000Hz or lower.  Unfortunately for me, this also results
in the decoder using SBR where it is not intended.  That's a limitation
of the aac encoder though... oh well.

So back to my other point, if a file uses SBR, the header will report
the base encoded samplerate, but the decoder will detect SBR and report
the SBR-extended samplerate.  Shouldn't ffplay be aware that the decoder
might change the samplerate due to SBR and adjust the SDL output
accordingly?  To me that's not working around a bug, but allowing for an
intended feature.


More information about the ffmpeg-devel mailing list