VRCUnityVideoPlayer Doesnt correctly pass AudioSource settings to the runtime VideoPlayer component.
WACOMalt
A Common setup for surround sound audio on VRChat video players in SDK2 was to use 6 audio sources, and a video file with 6 audio tracks each directed to their specific audio source.
On VRCSDK2 we'd edit the VideoPlayer component in this way (First Picture)
In SDK3, we have to use the VRCUnityVideoPlayer component, which seems to have the same feature labeled as "Target Audio Sources". I set this to 6 elements and plug in all my audio sources as before (Picture 2)
But when running, the VideoComponent that VRChat creates only has a single "Controlled Audio track" (Picture 3).
Without this working I'm not sure how we can do surround sound movies.
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Equinn
I have ran into a problem with the vrc unity video player as well which I think is related...There is zero documentation on this thing (that I could find), which is pretty terrible. I assumed this can be used to have several speakers playing the very same thing from the video player, but so far I've only gotten any output on "element 0" in the list when I tried adding multiple audio sources. It would be very nice to have at least some description of the functionality of this thing in the vrc docs (which are laughably lacking)....
WACOMalt
Just to add some detail, the order of audio sources is different in 2018 now than I had pictured here. The same problem still exists, I just didn't want anyone thinking my order was right in that screenshot. The order now is:
FrontLeft, Front Right, Front Center, LowFreq, BackLeft, Back Right.