I have Verizon FIOS, ATV4k and HDHR prime - (wired Ethernet and sound is via ARC).
So when ATV is in 5.1, I get great lip sync with iTunes movies, Netflix and Hulu. With Channels, the lip sync is all over the place… some channels are right on (CNN, PBS) most are off, some by quite a bit - mostly video ahead of audio.
In stereo, all channels look good.
FWIW, insta tv seems dead on with audio in 5.1, although the video is unwatchable🙄
HDHomeRun app on Xbox 1s looks dead on.
I’d rather not have to switch between 5.1 and stereo to use the channels app. Similar, I don’t want to be playing with audio delay when using different apps. I don’t really care about 5.1 on fios, but I like it for all other apps (Netflix etc), so I don’t MIND that it’s stereo.
I’ve obviously seen that other people have reported similar issues. If this is a pervasive issue, could you guys do something like an “auto stereo” option?