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HELP! Connecting cable box to computer for HD Recording
Forum Index -> Video -> Digital TV / DVB / HDTV Printer-friendly version
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wickedwheels
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Joined: 28 Apr 2008
Location: United States
Post Posted: Apr 28, 2008 02:05 Posts Comp View users profile Send private message Reply with quote
Here's what I'm looking to do...
I'd like to record HBO-type channels on my computer.

Will the following work?
Connecting the cable box to a video card such as an 8800GTX via DVI and then sending this signal out to the 50" 720p plasma via the other DVI.

If the HBO signal is encrypted, shouldn't it be decrypted once it passes through the cable box? If the video card and the TV are both HDCP-compatible will there be a problem?

I don't mind using the cable box to change the channel. I'm not looking to replace it (hence to tuner card). If this will not work does anyone have anything that works?

Bjs
RoadKill


Joined: 09 Feb 2004
Location: Australia
Post Posted: Apr 28, 2008 06:49 Posts Comp View users profile Send private message Reply with quote
Welcome wickedwheels

Sorry, but you have Digital Video Interface confused , its output, not an input, so no, what you thought you could do will not work.

You need to install a capture device in order to record.

There was a device which allowed passthrough of such signals, but I dont recall it by name just right now.

jagabo
Member


Joined: 09 Dec 2005
Location: none
Post Posted: Apr 28, 2008 07:11 Posts Comp View users profile Send private message Reply with quote
Hollywood is working very hard to make sure you can't record digital HD signals.

Among HD HDMI recorders is the Black Magic Intensity card.

http://www.blackmagic-design.com/products/intensity/

I'm pretty sure it will only record unencrypted HDMI signals (local broadcast channels). The Intensity Pro adds the ability to record HD component video.

The new Hauppauge HD PVR can record HD component.

http://www.hauppauge.com/site/products/data_hdpvr.html

wickedwheels
Member


Joined: 28 Apr 2008
Location: United States
Post Posted: Apr 29, 2008 10:03 Posts Comp View users profile Send private message Reply with quote
jagabo wrote:
Hollywood is working very hard to make sure you can't record digital HD signals.

Among HD HDMI recorders is the Black Magic Intensity card.

http://www.blackmagic-design.com/products/intensity/

I'm pretty sure it will only record unencrypted HDMI signals (local broadcast channels). The Intensity Pro adds the ability to record HD component video.

The new Hauppauge HD PVR can record HD component.

http://www.hauppauge.com/site/products/data_hdpvr.html


Can I use the Black Magic as a pass-through? Can I use it to record HDCP-encrypted channels since it has already passed through the cable box (afterall, the TV can display them)

jagabo
Member


Joined: 09 Dec 2005
Location: none
Post Posted: Apr 29, 2008 10:09 Posts Comp View users profile Send private message Reply with quote
HDCP encryption is used between the cable box and HDTV when using an HDMI cable. Part of the HDCP rules is not to ever pass the unecrypted digital data to any other device after decryption. The whole point of HDMI was to provide this secure data path for digital data.

This is different than the encryption used by cable companies when broadcasting. Yes, your cable box removes that encryption, but the video is reencrypted with HDCP for transmission from the cable box to the TV.

jpoey2
Member


Joined: 03 Mar 2006
Location: United States
Post Posted: May 20, 2008 22:37 Posts Comp View users profile Send private message Reply with quote
I bought the intensity hdmi card and tried it out the other night. My question is when I had it hooked up to my directtv it would only output to my tv in 480i mode. Is this due to copy protection? I have a bunch of games I've recorded that I would like to backup in high def but now that I've done some research it looks like the media Nazi's have us by the nuts when it comes to making backups of what we watch on tv.

jagabo
Member


Joined: 09 Dec 2005
Location: none
Post Posted: May 21, 2008 06:31 Posts Comp View users profile Send private message Reply with quote
jpoey2 wrote:
I bought the intensity hdmi card and tried it out the other night. My question is when I had it hooked up to my directtv it would only output to my tv in 480i mode. Is this due to copy protection?

I'm not sure what's hooked up how here but, yes, it sounds like HDMI restrictions. You are running HDMI from DirecTV to the intensity? What is the TV connected to? Via what type of cable? Are you saying the Intensity is only recording 480i or the TV is only displaying 480i? Or both?

jpoey2 wrote:
it looks like the media Nazi's have us by the nuts

Yes.

jpoey2
Member


Joined: 03 Mar 2006
Location: United States
Post Posted: May 21, 2008 11:39 Posts Comp View users profile Send private message Reply with quote
jagabo,

I'm running hdmi in to my pc and out to my aquos. I get a blank screen under 720 and 1080 but get picture in 480 on both the pc and aquos

jagabo
Member


Joined: 09 Dec 2005
Location: none
Post Posted: May 21, 2008 17:37 Posts Comp View users profile Send private message Reply with quote
The BlackMagic Intensity does not implement HDCP. All consumer HDMI devices do and will not send HD video to a non-HDCP device. So the DirecTV box is doing what it is supposed to -- downsamping to SD before sending to a non-HDCP HDMI device.

Keep an eye out for the forthcoming Hauppauge HD PVR. It looks like it will be able to record HD component video. That's not as good as getting the unadulterated MPEG stream right from the source but should be much better than having it downscaled to SD.

http://forum.videohelp.com/topic345063.html

jpoey2
Member


Joined: 03 Mar 2006
Location: United States
Post Posted: May 22, 2008 08:45 Posts Comp View users profile Send private message Reply with quote
The blackmagic intensity pro has that already. I did not get the Pro but it comes with the hdmi in/out and component as well.

I was hoping to save a few hockey games I recorded in HD but for the Pro to capture using the component I will need to set up a RAID which isn't something im interested in doing. Looks like I'll rebay the card.

Nelson37
Member


Joined: 14 Aug 2001
Post Posted: May 22, 2008 09:59 Posts Comp View users profile Send private message Reply with quote
So the file size captured by the Intensity is different depending on whether you use the HDMI or Component? I thought you got the same monstrous file either way?

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