Originally Posted by sewround
I have Cox in SoCal.
I called tech support and he said that the HD channels use a subcarriers that doesnt get recorded or processed when played back and thats why I dont see captions on playback.
Your problem sounds somewhat familiar. I have had Cox digital cable service (in Phoenix) since last December, and it seems to me that when I first tried it, I couldn't get captions to work on the DVR at all: "live" or on recordings. But I'm sure that as of about six months ago they were working OK, because I know I depended on them sometimes to figure out some of the dialog on Creature Comforts
(probably a show you've never heard of, on BBC America). I just checked, and the captions are working fine on the HD Wheel of Fortune
I recorded last night.
But our DVR isn't from Motorola: it's the SA8300HD. The captions depend on a setting that I can get by pushing the "settings" button on the remote twice, and scrolling to "CC: Source". My settings are "Std CC1", "Digital 1". They sound like factory defaults: I don't recall if I had to fiddle with those settings to get the captions to work.
The thing I haven't had much success with is SAP, and I think that may be what the tech was thinking of when he mentioned a subcarrier. In an NTSC signal, SAP is sent on a subcarrier, and closed captioning is sent during the vertical blanking interval. Of course with digital, neither subcarriers nor VBI apply. The only way I'm sure I can get SAP is by using my set's NTSC tuner and picking up the analog signal from the cable: this is mainly useful on certain PBS shows such as Masterpiece Theater
where the SAP carries their Descriptive Video Service.
Don't know if any of the above will be of any help, but I just wanted to say that it is possible to see captions on a HD show recorded using a Cox-provided DVR. I hope you can find a solution to your problem.