Never had a problem on telus optik with HDMI. The only thing I can think of is similar to audio sync on gaming machines based on ports....they say to adjust it because there isn't always audio/visual/input synchrony. Now I have no idea what would do that on a TV feed, only thing I can think of is if your video and audio feeds are separate, as mentioned up above somewhere, like HDMI video, rca audio, or component video and optical audio, etc the processing time would be different leading to the delay. Whereas for example HDMI with audio over one is processed at the same rate......
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