Skip to main content

Notice

Please note that most of the software linked on this forum is likely to be safe to use. If you are unsure, feel free to ask in the relevant topics, or send a private message to an administrator or moderator. To help curb the problems of false positives, or in the event that you do find actual malware, you can contribute through the article linked here.
Topic: aac 5.1 bitrate (Read 3434 times) previous topic - next topic
0 Members and 1 Guest are viewing this topic.

aac 5.1 bitrate

I searched through the forum and found that formula to compute the bitrate for 5.1 files :

bit rate = 2 x stereo bit rate for same quality + 1 mono bit rate for same q + X, where X is only few kb/s for LFE...

I have encoded ac3 files to 5.1 aac using oagmachine and lastest nero dlls using vbr he aac (50 - 70 kbps) profile.

With this profile i expect a 125 to 175 kbps file (which I know is poor quality..)

but my file is around 230 kbps (which is enoug quality i think) which would correspond to a 92 kbps profile in nero encoder.

Do I make a mistake in my computation ??? 

ex : 176kbps=2*70+35+1
WavPack 4.31 -hm

aac 5.1 bitrate

Reply #1
Quote
Do I make a mistake in my computation ??? 

I don't think so...This is simply the beauty of VBR 


In fact, the bitrate depends on many things : the kind of source, the "style" too (concert,  movie, etc...). 


edit : and the formula applies more to a codec with a cbr mode. Well...it's just an assumption. maybe i'm wrong.

aac 5.1 bitrate

Reply #2
thanks kurtnoise for your answer !
In fact the ac3 track is from star wars episode IV (la guerre des ├ętoiles quoi)
WavPack 4.31 -hm

 
SimplePortal 1.0.0 RC1 © 2008-2021