I am sorry for the late response. Correct me if i am wrong. Since i have a media center PC with a homebrew DVr, a bluray player and Apple tv, plus a cable box, all sourced by HDMI, and only the cable box has sync issues, if I adjust the delay via the tv or home theater receiver, all of the other devices except the cable box will be out of sync. By fixing the cable, I would cause the other sources to lose sync. Not a viable fix in my book. So a sync problem can be source specific.The problem is in the X1 platform no doubt about it. After an hours work the tech simply installed a legacy box and it went away. No delay adjustments were needed and all devices running into the common receiver and TV now work fine. I think there may an error correction issue andor lack of cpu power and it builds up over time. This may be why an X1 box reset fixes the issue for a short period of time.
Since my last posts I had major pixelization on all channels, all TVS. Slow internet also. Service techs replaced drop, made new connectors. Problem persisted.A few days later, at my insistance, a sweep tech ran the problem down and fixed it somewhere in the system. Plant maintenance fixed a high error rate. Coincidental or the original source of all the problems including X1?
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Since my last post , I have had a service call. I was able to A/B the Homerun Prime/ WMC picture with the one from the X1 and the Tech said he could clearly see the audio sync issue.The Tech then told me an X1 box cannot co exist with a cable card device. Of course if you look through the vents on the X1 you will see a Cable Card inside as you will with the older boxes. Some research indicates that the real Cable Card issue is that certain cable card devices, like older HDTivos, only will decode mpeg2 and cant handle the MPEG4 streams that Comcast is transitioning to. So if this is actualy their policy, the staff at the Xfinity store made a mistake swapping out my old SA 4250 hdc with an X1, because a Cable Card is clearly shown on my account. They should have sent me home with a Cisco non X1 older blue menu "legacy" box. Apparently these also cannot co-exist with X1 because of the X1 MOCA circuit .The older box's return signals apparently cause issues with the X1.For X1 there are supposed to be filters at the entry point to keep the the MOCA data from leaving the house back through the network or getting data from other homes and each X1 box must have a dedicated line back to the entry point of the house so that the MOCA delivered video from the DVR, which I do not subscribe to can stream to the non dvr X1 boxes elsewhere in the house.
So the tech checked signals, installed a filter , replaced a splitter , and isolated the X1 box so that it was directly fed from the street. Everything else in my house was out of the circuit. Twice the box froze on the loading channel logo. And the sound sync issues remained.
The solution? The tech removed the more advanced X1 box and Installed an older legacy box of the type I should have been given in the first place. Has not dropped out and no sync issues.
So this is my take. Comcast is rolling out MPEG4 HD because it more compressed, and allows more HD channels in the same bandwidth. This saves them money and is a more efficient transport. In order to do this the X1 boxes must have the abiltity to decode both MPEG2 and MPEG4. The Mpeg2 compatibilty is " a legacy feature" that will eventually be phased out. Mpeg4 decoding however is more processor intensive and this what the box must handle. They also need to compete with the advanced whole house features of Direct TV and Tivo hence the MOCA feature. By hypeing X1, selling dedicated X1 installations, in effect a system upgrade occurs. Eventually a critical mass is reached. However it is obvious that the the existing wiring of ones house and legacy equipment plays a role in the quality of the X1 experience. (I pay extra for wiring insurance) It is also clear that front line Xfinity store and CSRs on the phone need a lot more training so that the wrong box does not go into the wrong house. But even more so it seems that the network itself is not quite ready for x1 or the boxes themselves are not as robust as the older ones and require a much tighter system from their Head end to my house for it to work properly.
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Guide Black with white letters. Channel logos are in color, box has both HDMI and Component Outputs. I have internet and phone via my own modem router combination. There is another non x1 box in the house, (old blue guide) plus a DTA.
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Thanks for the response. So x1 and the older boxes are tuning the same Qam frequency? Makes sense from a bandwidth standpoint.I am having a service call on Tuesday. It seems that there are some "errors" occuring. Either it got worse or X1 is not as robust or I had the problem all along and the Comcast phone people were just doing the usual box swap from rote when i was told to swap out the 4250 hdc. Hopefully the service call fixes the problem. I will suggest to the tech that they look into the ad insertion issue. When an ad pops up in a differnent format, aspect ratio, or resolution, there seems to be some latency issues as whatever device tries to handle it , has to reset picture and the sound. If the right scaling was used at the head end,and on the inserted ads, no variations, no equipment in the home would be forced to compensate, if that makes sense?
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My dvr is a scratch built Windows Media Center PC and a Silicon Dust HD Homerun Prime cable card tuner. Cable Card is authorized by Comcast. Media Center connects to one of my Hometheater receiver's HDMI inputs. Cable Card Tuner is hard wired to ethernet within the house so up to three devices can tune cable channels without having to rent another box. It is all legal.Kodi or media center extenders all work fine. Same with Iphone. I can A/B the picture from the Media Center and the X1 non DVR on the same Panasonic 50 in. TV. Only the X1 has the delay issues to the point they are intolerable. Like I said, X 1 seems to not be very robust and the delay factors appear to be unique to it.
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I am not having to reset my box as would occur with no picture. I am resetting it to reduce the sound lag issue per the Comcast telephone people's instructions when i call in. Picture is fine all channels are coming in. Its the audio delay. Since you brought it up, what exactly is the technical difference with X1.I am a retired cable tv engineer so do not hold back on a detailed explanation. Is each channel an IP based stream as opposed to a discrete Qam broadcast? If so, why would my Apple Tv services not have a lag in their audio also. X1 seems for me to be more like marketing hype , simply more of modern looking guide and navigator than a new or better technology. It seems to be less robust worse at error correction than the older Qam boxes. Also, should i simply insist on a trouble call, whcih will no doubt involve another box swap?
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There is so much sync delay on my x1 today that it is not watchable on some channels. Also your cable system and mine may use different signal processing techniques prior to a signals arrival at the home. Google is my freind and i have tried every single piece of Internet Voodoo to solve the issue. I stand by my initial conclusions. X1 has sync issues none of my other devices have when routed identically through my setup. Nor did i have this issue with the older non X1 4250hdc, it is clearly variable by channel, worse on channels where there is local ad insertions, worse on HD cable channels and barely detectable on the local network stations.A simple channel surf bears this out. It is also not happening on my cable card device which is routed through the same Hometheater set up as the X1 cable box. Its is obviously anX1 issue.
There is a seroius flaw in the X1 system that they need to rectify. It not the superior experience as the advertising boasts. Multiple box resets are getting old and the front line staff telling me to rewire my setup which is built into a cabinet , or do another box swap, simply means they are not listenting to me and are reciting their solutions from rote.
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My old SA 4250 HDC box died. Took it to the Xfinity store and was given an X1 non DVR box. My set up involves a Bluray Player, Apple TV , Cable Card device driving a Windows Media Center DVR and a Cable Box. All components connect to a Sony Hometheater Receiver via HDMI or Component. The Receiver handles all audio and sends the video via HDMI to a Panansonic 50in tv.
Aside from the new X1 box not having the setup capabilities of the old box like pass through it has a better picture. However after a few days , depending on the channel, the audio becomes out of sync with the video. This rarely ever happpended with the old box and never happens with my other equipment running through the same set up. Therefore the issue is an X1 problem unique to itself. Resetting it helps, hitting it from the office helps but over time it gets so annoying that I am convinced that any claims that issues is actually solved are false.
Some observations. Off Air HD channels from the networks through the x1 box DO NOT HAVE THE PROBLEM. SD Cable Networks that are not also shown in HD , do not seem to have the sysnc issue as badly. The channels with the greatest sync problem are those HD Cable Channels where local advertising is inserted often. Much of this is old low tech SD 4;3 stuff and looks awful on an hd tv. When the boxes had pass through these format changes would cause chirps and drop outs when they came on because the receiver had to rescale during the commercial.Only fix was to keep the box on 1080I and live with the obnoxious stretch look or be satisfied with half sized pictures with alll border black barred.
Hence i think this may be why they ended pass through on the new boxes. So the X1 box is now handling all of these scaling issues and it may not be robust enought to handle repetitive format changes that happen when SD or even multi format commercials are inserted and they start to develop a lag issue. Just a theory but my observations suggest something in this area is going on.
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