Return to the Electronics Forum | Post a Follow-Up

On demand - DVD

Posted by cavell (My Page) on
Mon, May 28, 12 at 11:27

Have Comcast cable. And Philips DVD recorder. I can make a DVD copy of live programming but cannot use the on demand function to make a copy of same show. Tech said no on demand show can be recorded. That would be too convenient. But I can make copies of any live show? I edit out commercials and on demand has little too none so it's easier to record.

Follow-Up Postings:

RE: On demand - DVD

If the content provider and/or the cable company want to prevent the recording of a show, there is very little that the average viewer can do about it. There may be other options if you were willing to capture the program to a computer and had the knowledge/software to edit the program, but most folks aren't going to go to that much trouble over a tv show and they know that. Last year I ruined several DVDs trying to record a football game on the Big Ten Network before I learned that they use copy-protection. Advertisers will do everything they can to keep the audience captive and the content providers will cooperate to keep them happy and keep the ad dollars rolling in.

RE: On demand - DVD

Well it does record after all. The show was 3 hrs live but on demand said it was 97 minutes. I called tech and asked about time difference and he said I could not record it. Than I tried it, and it worked.

RE: On demand - DVD

To the best of my knowledge, Comcast has not utilized ACP (analog copy protection) on the video outputs of STBs, other than in some limited trial tests.

DVD recorders do not need to be affected by ACP waveform directly, but instead simply use detection circuitry to detect the ACP signal on the analog signal, or flagged within the MPEG bit stream if they accept a MPEG transport stream, and then inhibit recording.

Again, though, I'm not aware of any current ACP use by Comcast.

RE: On demand - DVD


Something I thought of at 3:00 am this morning while tossing and turning - and thinking about everything else! - was that Comcast may be utilizing CGMS-A (Copy Generation Management System - Analog).

These are bits set in a digital code that exists on line 20 of the analog video within the VBI (vertical blanking interval).

The two bits are within a 7 bit word that indicate: 00 freely copy, 01 copy no more (bits that are rolled when you make your first authorized copy), 10 copy once (as authorized that then roll to 01), and 11 copy never.

DVD recorders are designed to read these bits and act accordingly.

Either way, if it's ACP or CGMS-A, the DVD recorder will usually display a "copying not permitted" type of message.

RE: On demand - DVD

The unit is a Philips dvdr 3475. I tried to record avatar on FX and I got an error message and no go. Only movie I have had issues with.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Electronics Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here