5.1 audio and 2.1 audio size difference

[angela_s]

Hi everyone

I have a question about video encoding in MP4 format. If I encode a video in H264 mp4 format and there is an option to either encode with 2 channel or 6 channel audio, then how much will the video encoded with 6 channel audio exceed the video with 2 channel video in terms of file size say per minute or per hour of video (assuming all other settings and selected values are same in both the cases)?

I know that this value must vary from file to file but I need an average value or rather a range of size differences based on your experiences.

Thanks in advance.

[El Heggunte]

Rough calculation:

2.0 @ N kbps = X MB

5.1 @ 2.5N kbps = 2.5X MB

So, if X = 200MB, then 2.5X = 500MB.