Sat down to watch an iTunes rented movie last night on my ATV 4 and had horrible delay between picture and audio. My setup is ATV into LG TV via HDMI then audio from TV optical out to brand new Vizio sounder. My guess is that the culprit is the TV>soundbar, because the video is ahead of the audio so I think by the time the TV has processed the HDMI signal, send the audio to optical out and then the soundbar has done its bit the corresponding frames have already appeared on the screen. My TV has no audio-sync options that I can find, so I'm wondering if my best option isn't to get an HDMI audio-extractor? If I'm going that route I could potentially find myself with audio leading video, so does anyone know if you can get an extractor with sync adjustment?