About chuckreti

@Rustyben wrote: sync on each device you named is separate from the HDMI connected device you are using. each setting is kept by the TV separately. audio is attached as a stream to the video by the producer of the programming.  Yes, once again, I know all that. That's not the problem. There are single, individual channels that have sync issues, not the output of X1 box overall. Today, one of the problematic feeds, WDIV (NBC Detroit), looks correct for a change. Will just have to tolerate the others and hope someone at Comcast figures to monitor and tweak a frame sync box. Signing off this thread. Bye. C.R. ... View more

@Rustyben wrote:   The 'sink' (TV) has ajustments per HDMI connected device in the TV's auido setup lip-sync. set that while watching a major network like cnn/fox news/msnbc to get best lip sync. there is no difference when processing/transcoding etc made to audio sync as it is just another stream (like captions) and has one major and one 0.7 second backup sync signals contantly keeping it in sync with the video. again the TV has the only adjustment for moving the audio to match. I know how all that works. I don't need to make any sync adjustment on the TV when receiving the stations mentioned off-air via antenna, nor with (HDMI) Blu-ray player. And as I mentioned, when watching with the X1 (HDMI) the TV's sync adjustment only provides further degree of audio delay, not what it needs. The problem with some Xfinity sources, only certain local broadcast channels, is that,  as it leaves the output connector, their audio is already delayed by an annoying number of frames. I have connected the X1 box to other HDMI equipped sets and see the same result. (lip sync off on same channels). A friend, also on Xfinity, observes the same thing on his system, asking me why some of the stations (including one I work at, BTW) always looks out of sync. ... View more

@Bob712 wrote: Sounds like antenna for those stations is the way to go for now. Fortunately I am in a good signal area, and have been using the over the air signals for those stations for many years. Until I got the service plan with the X1, I was only getting the Standard Def feed from Xfinity, so all HD programing I watched came over air via the antenna. Also, most of the new diginet subchannels that are carried by the broadcast stations (Cozi, Charge, GETtv, Retro, Decades, to name a few) are not available on Xfinity. ... View more

@Bob712 wrote: Switching inputs on X1 controller brings it back into sync for me. Have to do it every so often but only takes a few seconds. This took care of the "global" sync issue. I still have three local broadcast stations that are perpetually out of sync while all other sources are correct. A head-end technical issue. ... View more

@Oigarv013 wrote: Hey guys, I was having the same issue. I only have the xfinity flex box,  during first setup, i remeber it asked about audio, and i selected "dolby 5.1". Some channels/ movies are close to proper sync while others are way off. So I went back to setting on the xfinity flex box under audio and selected "standard". Immediately I checked the movie I was watching while doing the settings, and it immediately is now in proper sync. Haven't had any out of sync issues since. Thats just my fix, you guys situation, audio setup etc might  be different . De-selecting Dolby 5.1 did take care of the issue, for the most part. Most program sources are in proper lip sync. However, there are three of my local broadcast channels, WDIV, WMYD and WKBD, that are always out of sync, viewed on X1. They (and their subchannels) are in perfect sync wnen viewing off-air with antenna, so it appears that Comcast's processing and re-encoding these particular signals is at fault. Audio lags video by a couple of frames or more. My TV has a "lip sync" adjust, but that only adds more delay to audio. ... View more

@lesmikesell wrote: Isn't the usual variable part how long it takes the TV to display a video frame with associated processing and upscaling? Yes, the protocols to keep audio and video data in sync are part of the engineering design of video transport streams. If this was always a fixed offset, a simple trim of the TV receiver's Lip Sync compensation would take care of the latencies due to signal processing. The problem I and others are seeing with X1 is that sync offset drifts over time, or is not off by a constant factor. ... View more

have you rebooted your set top box? a 'wide-spread' problem would have hundreds of posts here daily. standard test is to plug the set top box into the TV and use the TV's speakers instead of the sound bar. if needed use TV remote and menu to set lip-sync. then let it run for hours/days to determine the problem. note that before doing any of that, when you are experiencing the problem unplug the set top box for 30 seconds or more and plug back in. you may be having a device problem with the set top box, too. Rebooting the set top box was among the first things I did. I have many years experience in electronics and video troubleshooting; that and a power cycle top the list. "Widespread" -I did a search of X1 Lip Sync problems and came up with literally hundreds of posts dating back over two years, so not a new thing, apparently. I do not wish to use the (crummy) TV speakers. That's why I have the sound bar. "Drifting" and differing amounts of sync error point to a flaw in the X1 decoding and transport software or hardware, as noted on this forum and others. A temp fix that I found, posted on YouTube by a user,  is the Switch Audio Settings from Auto 5.1 Surround to Stereo and back to Auto 5.1. Seems to work, at least for an evening's viewing sesson. ... View more

New X1 as of Nov 10, lip sync issue manifesting itself. A tweak to the receiver's lip sync offset is not a solution, in that the video does not lag audio by a constant amount, but varies from just a few frames off to many seconds, even during the course of the same program. Being new to this equipment, I engaged a "Chat" rep, who, of course was unaware that this is a widespread and ongoing X1 issue.  I was referred to the "Audio setup" page in X1 Help. Did all that stuff already, thank you. My setup is X1>HDMI to VIZIO receiver. From set to Vizio sound bar, no difference with sync whether trying digi, optical or analog from set to sound bar. Never sync issues with the old Moto box, nor with AppleTV or Over-the-Air broadcast.   @Rustyben wrote: each device can be adjusted independently of the other HDMI ports using the TV's remote and audio menu. find the lip-sync adjustment and set +/- to match for a network video that has easily viewable lips (talking heads).    ... View more