I 've been requested to mix the audio for a short movie I worked in as sound recordist, nothing particularly challenging but considering it will be on the web and probably in some festival I run in this issue, what format do I have to deliver into? LR would be the more obvious on the web but if it is going to be in some theatre for a festival? My setup is stereo, I can just add a 3rd monitor and trying to make a 3.0 mix and encode it in Lt Rt? there is any way to encode lt rt with some plugin available or other apps like compressor?
I would suggest to deliver a 3.0 mix (possibly as a 5.1 with silence on surrounds and LFE) for the theaters and a 2.0 for web/broadcast.
LtRt doesn't seem to have any advantages today (if you want to deliver a 3.0 mix, use a 5.1 ac3 or aac encoded stream that most players will be able to downmix to 2.0 if needed.