[Ffmpeg-devel] -ab 128 doesn't work with aac encoding?

[Patrice Bensoussan]

Does it mean that the -ab option is just ignored when encoding in AAC?
or is it used to give the max value which should be used during  
encoding?

Thanks,
Patrice

 >On 25/08/05, Patrice Bensoussan <patrice.bensoussan at free.fr> wrote:
 >> Hello,
 >>
 >> I'm trying to convert a WMA file to AAC 128kbit, but it seems the  
-ab
 >> option
 >> doesn't work : when I use -ab 128, the created file is 94kbit
 >> according to quicktime 7 :
 >> Any idea what is happening? (i'm using the lastest ffmpeg cvs)
 >
 >AAC has no CBR method, at best, it is ABR. If the file does not have
 >the complexity to require 128kbps, then it will be below the requested
 >bitrate. I suspect that if you had a longer sample, it would more
 >likely reach the bitrate.