I haven't seen anything on this topic, so maybe everyone but me already knows the answer - is there a way to save/download content from my Comcast/Xfinity DVR to my Macintosh computer? Brand new, state of the art iOS Mac and Apple TV, in house WiFi and HDMI cable. That's my hardware. A techie guy at work said he was pretty sure it was possible, then a Geek Squad guy told me 'no way'. Who's right?
If you'd like control over what you record after you record it, to be able to transcode those recordings for iOS devices and Apple TVs and to add that content to iTunes, instead of using Comcast's boxes, it's better to rely on EyeTV or TiVo or boot into Windows in order to record with a CableCard tuner like the HD HomeRun Prime.
I use an Avermedia HDDVR card to capture from a DVR (has worked with Comcast, DirecTV and Dish). You have to use a component input with separate audio (analog) to avoid the HDCP errors. Does good HD in various formats (I use Mpeg) but the audio is only stereo. It's a less expensive alternative to the Homerun or Prime is all you want to do is capture and not do the original recordings.
Not sure if it's compatible with Mac without a Windows OS.
I use a Happauge! HD PVR to capture stuff using the component outputs on my Dish 211K satellite receiver with EyeTV. I've captured hundreds of hours and am able to save it without decompressing saving a lot of time.