I don't understand why the tv sound is hashed when I watch some streaming like Live News or Series on my Apple TV 4K and sometimes the sound is not sync with the video. Any help 'll be welcome.
Best answer by Airgetlam
The PLAYBAR has no way of communicating back to your TV set. This means that HDMI-CEC won't work, and all of the attached systems have no idea what device they're playing on.
So, I'd be looking at a few things in your system. First, I'd look at the TV set, and make sure that it's up to date on its firmware. Often the latest firmware has fixes in it that older versions are lacking. Then I'd be checking the audio settings on the TV set, and turn off any items that might be modifying the audio stream, other than limiting it to Dolby Digital. Don't allow your TV to set its own audio stream choices, lock it down.
Then I'd be looking at the audio settings on the Apple TV 4K. Go to Settings>Video and Audio> and under the Audio area, make sure that Audio Output is set to xx(HDMI), and Audio Format is set to Dolby Digital 5.1
Finally, while playing something on the TV, I'd be looking at the icons along the bottom of the controller, to see if enhance speech or night mode is turned on. It's explained here: