Average bitrate changes

[ekenet]

When I try to encode my AC3 audio file using BeSweet with 128kbps (to mp3) I sometimes get 117kbps or even more, like 138kbps. Why? Is there a way to force it to be 128kbps?

[bond]

Originally posted by ekenet
When I try to encode my AC3 audio file using BeSweet with 128kbps (to mp3) I sometimes get 117kbps or even more, like 138kbps. Why?because you use a vbr or abr setting, variable bitrate is a superior encoding technology than constant bitrate,
everything is ok with your file

Is there a way to force it to be 128kbps?yes use a cbr setting, ie alt-preset cbr 128

[ekenet]

alright, thanks mate :) sorry for the newbie question.

[ekenet]

So if i really, really want the audio file to be 128kbps, I have to encode in CBR?

[KpeX]

Originally posted by ekenet
So if i really, really want the audio file to be 128kbps, I have to encode in CBR?

Most likely, yes. What Lame options are you using in besweet?

[ekenet]

Originally posted by KpeX
Most likely, yes. What Lame options are you using in besweet?

'abr 128' preset is used (from the log)

[KpeX]

I'd confirm your bitrate in Winamp, then if it really is too far off from 128, then yes, you'll need to encode CBR to hit it right on.

[pacohaas]

of course, you could always use trial by error to get 128kbps using ABR, which would give you better quality than the CBR 128kbps encode.