Loudness trouble when streaming live concerts on Youtube - Just in 5.1 surround while stereo is OK

Alaghi

New Member
I am having trouble streaming live concerts on youtube, using 5.1 surround audio.
My setup:
- iMac 30" 3GHz dualcore + scarlett 18i20 just for audio
- macbook pro 2016 + clarett 4pre USB + 3 cameras (insta 360 + 2 cellphones w/ droidcam) for OBS

My imac mixes the audio from 4 microphones, using compressors, noise reduction, EQ, reverb and a limiter on the very last step. I am mixing using Logic Pro, and fabfilter plugins.
The limiter is set for -1.1dB peak. The levels are always touching the top without clipping.

This audio is sent to the macbook pro using digital channels. OBS is receiving the audio OK, the meter levels are touching the red lights, without clipping. Everything looks OK on the meters.
The channels are set L, R, C, Lfe, sL, sR on OBS.

But after the streaming, when I listen the video on 5.1 surround mode, the loudness is too low, around 18db lower than it should be.
When listening on my phone or in a system with stereo playback, the loudness is OK.

It looks like Youtube is compressing or lowering loudness just on 5.1 surround, while automatic stereo downmix sounds fine.

Two concerts I streamed yesterday.



This concert was streamed natively in stereo, I have no trouble about loudness. The mixing is slightly different, but keeping the same steps and compressor setups.



How to fix the surround loudness? Do you have a clue?
 
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