[mythtv-users] OT: 120hz?

Matt Emmott memmott at gmail.com
Sat Dec 3 04:50:45 UTC 2011

On Fri, Dec 2, 2011 at 10:22 PM, Matt Emmott <memmott at gmail.com> wrote:

> On Fri, Dec 2, 2011 at 9:11 PM, Eric Sharkey <eric at lisaneric.org> wrote:
>> On Fri, Dec 2, 2011 at 8:31 PM, Richard Shaw <hobbes1069 at gmail.com>
>> wrote:
>> > On Fri, Dec 2, 2011 at 7:12 PM, Matt Emmott <memmott at gmail.com> wrote:
>> >> Not Myth specific but I can't think of a better group to ask this
>> question:
>> >>
>> >> I just picked up a Sharp Aquos tv, capable of 1080p @ 120hz. My MythTV
>> FE
>> >> has an integrated GeForce 9300 and is connected via VGA, but the
>> settings
>> >> won't let me go over 60hz. Is it possible to go higher on the refresh?
>> The
>> >> motherboard has an HDMI port - I've never used HDMI out on a PC
>> before, but
>> >> if that's what it takes I'm willing to give it a shot.
>> >
>> > As far as I know most, if not all, manufactures don't accept more that
>> > 60Hz. The 120/240/+++Hz is the internal refresh rate, not that rate it
>> > accepts a signal.
>> That's right.  The reason for buying a 120Hz set is not to show 120Hz
>> content, but to be able to show both 30Hz and 24Hz content smoothly.
>> On a 60Hz set, with native 24 Hz content, it shows alternate frames
>> for 2 then 3 refreshes.  With a 120Hz set, it can show each frame
>> exactly 5 times, leading to smoother motion.  For 48Hz content (just
>> starting to rise in popularity) you need a 240 Hz set.
> I knew you guys would have all the answers. The smoothness is a bit
> jarring and kind of makes me motion sick. It reminds me of old videotaped
> stuff, only a lot sharper.
> So, theoretically, an uncompressed rip of a Blu-ray disc played back on my
> Mythbox should look identical to the same Blu-ray content played on a
> Blu-ray player? The PC input on the tv is VGA, not DVI. I assume that
> switching from VGA to HDMI would result in a better picture?

To answer my own question, I'd say HDMI. I played a 1080p rip of Tron
Legacy on my Mythbox over VGA, and then I played the same rip on my Boxee
Box over HDMI, and the Boxee Box playback was much better. I suppose I'm
comparing a bit of apples to oranges since the hardware is different, but
after doing some reading it looks like VGA is analog and some detail is
lost in the digital-to-analog conversion.
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