The suggestion of changing the cable box to 720p from 1080p is an interesting one and could very well help with image quality as most TVs probably upscale better than the X1 box.
Unfortunately this has the downside that your local NBC/CBS (which are still in 1080i) will go through an unneccessary downcoversion.
Older Comcast boxes used to offer a 'direct' option, where 720p would be sent as 720p and 1080i as 1080i. As near I know this is not available on X1 hardware.
Let's hope that Comcast takes this image quality issue seriously and takes a hard look at their encoding options and ultimately IP delivered TV.
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Last night I watched various parts of the latest Game of Thrones episode using three different mechanisms on a 75" tv:
1) DVR recording of HBO channel
3) HBO Go App (XBOX One S)
In my opinion the picture quality was significantly better via the HBO GO App than On-demand or the HBO broadcast on Comcast. The difference was so great that I don't think there is really much room for debate...there is a big degradation in quality in the re-encoding to 720p with a much lower bitrate. Hopefully Comcast is able to work out a better solution, particularly for premium channels such as HBO.
Thankfully the workaround of using the HBO Go app is reasonable, but many stations (e.g. AMC) don't necessarily have an equivelent or always provide access to full episodes of the latest seasons.
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