Bug Report Audio AAC isn't stable

G

Geoning

Member
I'm not sure, maybe it's bug's OBS...
(I deleted previous post.)

I made short video for test.
CBR, 395kbps bitrate, 100buffer
AAC 48kbps
DURIKsF.png



How you can see, OBS encoded AAC ~109kbps

Is it bug OBS or I made something wrong?
L5PAOpB.png



With MP3 48kbps everything is ok.
When audio is silenced, OBS was encoding AAC audio bitrate 0kbps, with MP3 is still stable 48kbps.
 
T

Tak0r

Member
The CBR Setting corresponds to the Video Encoding, not the Audio. AAC is encoded using VBR, mp3 as CBR that's why you're seeing this
 
W

WayZHC

Member
That 109Kb/s might be just a spike. I'm sure most of the audio file is in about 50Kbps but some 109Kbps spikes like at start or at stop of stream might show it as 109Kbps in windows. I wouldn't rely on what windows says.
 
G

Geoning

Member
No, it's average audio bitrate. OBS says this same. How said Tak0r. AAC in OBS is VBR. Is it possible to improve AAC and add CBR AAC ?
 
G

Geoning

Member
Yes, but I won't get high ping with better sound quality.
MP3 48kbps CBR < AAC 48kbps CBR.

I guess that it should be add (like a separate option mp3, aac cbr, aac vbr)
 
V

Voxletum

Member
We expect this to be changed in the future, but currently AAC doesn't like to work below a bit rate of about 110 which is what you're seeing. If you want to use an audio bitrate lower than this, you should use MP3.
 
dodgepong

dodgepong

Administrator
Community Helper
Voxletum said:
We expect this to be changed in the future, but currently AAC doesn't like to work below a bit rate of about 110 which is what you're seeing. If you want to use an audio bitrate lower than this, you should use MP3.
Click to expand...
Interesting, good to know.
 
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