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Xfinity TV wifi adapter design problem leads to drifting audio/visual sync
The Xfinity TV wifi adapter design has a problem leads to drifting audio/visual sync. In particular with a noisy RF environment such as apartment or condo buildings. It appears that the audio is carried over a TCP based protocol while the video is carried over a UDP based protocol. The problem is that with a high frame error environment, the audio will be retransmitted when errors happen, leading to an ever-increasing audio/visual delay as the video is not retransmitted. After a power-on restart, viewing TV through the xfinity wifi adapter is fine, but over several hours the audio drifts to a longer and longer lag, sometimes reaching a full second. I fix it by cycling power on the wifi adapter, which is very annoying. You need to fix the firmware in the xfinity wifi adapter to use a fully UDP based protocol such as RTP or RTSP to keep audio/visual synchronized.
When using the smart TV's (Sony) built-in wifi, so it is exactly the same wifi radio environment, the TV's streaming apps like Netflix or AppleTV do not lose sync at all. It is strictly a problem with the Xfinity wifi adapter box, where regular "cable" TV has ever-increasing audio lag and even Netflix over the xfinity wifi adapter also has ever-increasing audio lag.
This really needs to be fixed. I do not like having to power cycle the Xfinity wifi adapter once or more daily.
XfinityMelinda
Official Employee
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144 Messages
9 hours ago
Hello @user_e7t51a, and thank you for posting our Xfinity Forum providing this detailed write-up.❤️ We completely understand how frustrating it is to have audio gradually drift out of sync, especially when a power cycle becomes the only temporary fix. This is not the experience we want our customers to have.
While we’re not able to confirm protocol-level details here, we do want to help with troubleshooting and make sure your feedback is shared with the appropriate team.
To help narrow this down, could you share a few details?
- Which device model are you using (for example: Xi6, XiOne, or Xi5), and is it connected wirelessly or via Ethernet?
- Do you notice the sync drift on live TV only, or also within apps like Netflix on that same box?
- About how long does it take before the delay becomes noticeable?
- What is your audio setup (TV speakers vs. soundbar/receiver), and have you tried another HDMI cable or port?
Here is some information that may help improve your experience:
- If possible, try connecting our box via Ethernet to see if the drift continues. Wireless TV Boxes support a wired connection, which can help rule out WiFi interference.
- Make sure the box is positioned where it maintains a strong, consistent connection to your gateway.
You can more information about troubleshooting audio from our helpful article https://www.xfinity.com/support/articles/troubleshooting-audio-issues-with-xfinity-tv
and for more information about our Wireless TV Box setup and requirements, see: https://www.xfinity.com/support/articles/wireless-tv-box-faqs
Please give these steps a try and let us know how it goes. If the issue continues, we’ll be happy to take a closer look with you.
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