[mythtv-users] Hardware configuration and capabilities of MythTV
raymond at wagnerrp.com
Mon Feb 7 21:37:40 UTC 2011
On 2/7/2011 15:51, Reynolds, Brian wrote:
> I have been browsing the wiki since I sent my last message and see now
> that the ATI cards are not well supported in Linux. I thought I read
> somewhere that there is a Windows version of Myth?
We have a frontend only build for Windows. There is neither support for
VfW or BDA, which are the primary capture APIs on Windows.
> Hmmm... that really blows if I wouldn't be able to watch/record the
> premium channels with either the HDHomeRun Prime or the Cable
> Box/firewire. What's the point of the cablecard if I can't watch/record
> all the channels I paid for?
That is exactly what cablecard is for. It allows access to any content
you have subscribed to.
In a sane world, the tuner card would decide whether you had right to
the content, and if so, decrypt it, and pass it onto the system
unencumbered. After all, you paid for the right to access that
content. That's how conditional access systems like CI cards with DVB
systems work. Sadly, they are moving to CI+, which is a scheme similar
CableCard is a DRM scheme, which means it must maintain control over the
content at all times. There are three levels: copy freely, copy once,
and copy never. Copy freely content is uncontrolled, meaning any
content flagged as such is passed to the system unencumbered. This is
content we are allowed to access through MythTV.
Copy once content is not allowed to be duplicated, so in order to ensure
this, the tuner card will only pass the content onto a Cable Labs
certified device. That means certified hardware, running a certified
operating system, and certified media center software, and certified
video hardware. All together... that means Windows Media Center 7 and
an HDMI/HDCP capable video card. In this mode, content is captured,
decrypted, encrypted, passed to the system, stored, read, passed back
through the tuner card, authorized, decrypted, passed through a
protected channel to the video card, decoded, encrypted, passed to the
tv, decrypted, and displayed. It reads like something out of
Hitchhikers Guide. Content cannot be removed from the system, must be
authorized for playback at time of playback by the cable company
(meaning they can lock you out of your recordings at any time) and can
only be streamed to other compatible Cable Labs certified devices,
meaning Media Center Extenders.
Copy never content is even more restrictive, and usually reserved for
on-demand content, and other premium channels that offer on-demand
services. Content can be recorded and paused like with a normal DVR,
but it has a enforced 90 minute rolling window. After 90 minutes, the
content is locked and deleted.
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