On Fri, Jun 29, 2012 at 3:10 PM, <aschuler@xxxxxxxxxx> wrote: > Great info. I'm less familiar with the way that Cable is > transmitted, but I do understand that ATSC carries multiple > channels per frequency. Are you suggesting that I could > capture a single stream from a single tuner which would > contain several channels, and pull the CC data for all of > those channels from a single stream? Would QAM work similarly? > ( Assuming the feed is unencrypted ) Yes, QAM is very similar. On many cable systems, while there may be fifteen or twenty unencrypted channels, they are spread across only three our four actual frequencies (meaning 3-4 tuners could grab effectively all the unencrypted channels at the same time). > I've found that most, if not all, cable boxes do not pass > through CC data, because they are meant to interpret it and > pass it on with customized formatting and whatnot, so another > scaling challenge will be finding a feed that I can use > without a cable box. OTA broadcasts have been my testing > ground because they are so readily available. Yeah, the fact that many cable boxes don't provide a way to expose CC data other than their inserting the decoded text into the video is pretty frustrating. Bear in mind though that since you don't care about the video then as long as the cable box has standard definition outputs then it may very well include the CC data (HD component and HDMI don't have a way to send CC data, but the older standard def outputs still do). You should definitely look at the Cablecard based devices such as the HD HomeRun Prime, Ceton InfiniTV, or Hauppauge DCR-2650. These devices will allow you to get to the unencrypted streams including CC data (assuming that the channel is marked "copy freely"). Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
