[mythtv-users] Frontend Lockups

[Frank Merrill]

On Fri, Feb 5, 2010 at 1:06 AM, Phil Wild <philwild at gmail.com> wrote:
>> A few things.  First, the chart on that page says that the 9500 will
>> do 1080i de-interlacing using Advanced 2X but with possible stuttering
>> on occasion.
>> To do any 2x interlacing, your display has to be able to do double the
>> refresh rate to accommodate a doubled frame-rate, so, for example, if
>> your currently set refesh rate is at 60Hz, can your display do 120Hz?
>> If not, then you won't be able to use the 2X de-interlacers. (the card
>> can do them, but the display also has to be able to)
>> I suspect your 1920x1080 display would be able to do it, but you may
>> need to adjust your Nvidia-Settings and see what refresh rate you have
>> set in there now.
>> You also should check the display specs to see if it will do double
>> that rate or not.
>> Is it really a 1920x1080 display, or is that just a resolution the
>> display says it will accept?
>>
>
> I don't believe this is true. A 60Hz 1080i video stream is 30 frames
> of odd lines (540 lines) interlaced with 30 frames of even lines (540
> lines) every second.
>
> I am not sure what exactly advanced 2x does to create the final
> stream, but the final stream is 1080p at 60Hz, not 120Hz.
>
> Happy to be corrected if I am wrong though...
>
>

No, you are right, I worded it poorly and I shouldn't have used 60Hz
as an example, as in reality 1080i is broadcast between 25 and 30
frames per second, and the 2X de-interlacers double the frame rate, so
a 25fps or 30fps stream would be doubled and require a 50Hz or 60Hz
refresh rate.
My point was mainly that Advanced 2X requires the display to be able
to accept double the frame rate of the input content.

Frank