I read in other thread "Facebook kills audio quality" that solution is to fill one channel with the other - making it mono.
I've been doing audio recordings for decades, and know about that certain spatial processing can result in poor sound as mono.
So the mono check is mandatory to do - to know how it will be if a mono device just mixing the two channels together.
Does PRE do things to audio creating different phase than original tracks?
Just suprised that it is was an error to have stereo, and you should make it mono by filling one channel with content of the other.
I used an editor in the 90's doing tuts to my products, and there was various setting regarding audio interleave and such in the stream - which affected lipsync etc.
Anything audio settings like that to think about in PRE15?
Haven't used PRE15 for some months now, since I am waiting for an update for crashes I had.
But evaluate editors also by reading forums to see what I will keep and use in future.
I am not aware of Premiere Elements doing anything to your audio or video unless you tell it to.
And I've never had a problem posting a stereo MP4 to Facebook -- though I've no idea what Facebook does once you upload the file. (Like YouTube and Vimeo, Facebook does, of course, re-encode both your audio and video to allow for efficient streaming.)
Seems that apps ran by another user with the other thread made it mono or something then - since copying one channel audio to the other made it sound ok. Having phase problems.
Or maybe app were stereo in itself, but using mono phones or something, summing both channels to one.
Just made me wonder a bit, where this happend.....