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24Hz Refresh Rate Problem

 
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Phil Smith



Joined: 08 Mar 2006
Posts: 6725



PostLink    Posted: Sat Jun 14, 2008 8:59 pm    Post subject: 24Hz Refresh Rate Problem Reply with quote


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I was advised to try 24Hz refresh rate with my new plasma. It worked fine - until the first time I tried to play a ripped DVD with a 30Hz refresh rate. It played badly, and having just updated my ripping program, I though it was a bad rip, or a difficult DVD to play. After an hour of jacking with ReClock, it finally dawned on me that the 24Hz refresh rate might be the problem. It was. Changed it to 60Hz and all is well! Smile Both 24 and 30Hz DVDs play flawlessly. After discovering it, the reason for the problem was pretty obvious.

Just thought I'd give everyone a heads up in case they run into the same problem.

It just dawned on me while writing this post: Maybe I should try 30Hz. Question
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AnalogRocks
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PostLink    Posted: Sun Jun 15, 2008 12:28 am    Post subject: Reply with quote

How about you split the difference and run 48Hz?
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Phil Smith



Joined: 08 Mar 2006
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PostLink    Posted: Sun Jun 15, 2008 1:40 am    Post subject: Reply with quote

I'll give it a try! I'm not clear on the benefit though. Could you explain?

Dave and Mark seemed to suggest that the lower the refresh rate, the better - with a fixed pixel display. Having never owned one (or had any interest in them) until a couple of weeks ago, I'm embarrassingly ignorant on the subject.
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AnalogRocks
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PostLink    Posted: Sun Jun 15, 2008 4:07 am    Post subject: Reply with quote

Hey dyed in the wool hard core CRT guy here. I'm just thinking your computer, when running 48Hz would look better with film content. OR you could switch depending on what your watching. What kind of DVD was it that had 30Hz?
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Phil Smith



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PostLink    Posted: Mon Jun 16, 2008 1:08 am    Post subject: Reply with quote

Apparently, because digital displays render the entire frame at once, and I guess the transition to the next frame is pretty fast, the picture is inherently smooth. So there's no need for higher refresh rates. At least I THINK that's what going on.
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Phil Smith



Joined: 08 Mar 2006
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PostLink    Posted: Wed Jun 18, 2008 5:21 pm    Post subject: Reply with quote

I tried 30 and 48Hz refresh rates a couple of day ago. For playback of 24 and 30Hz DVDs, 60Hz still seems to be the least troublesome.
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Phil Smith



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PostLink    Posted: Wed Jun 18, 2008 5:23 pm    Post subject: Reply with quote

AnalogRocks wrote:
What kind of DVD was it that had 30Hz?

Some independent films and almost all documentaries. I watch a lot of this kind of stuff, but most people probably won't run into 30Hz very often.
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Nashou66



Joined: 12 Jan 2007
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Location: West Seneca NY


PostLink    Posted: Wed Jun 18, 2008 7:37 pm    Post subject: Reply with quote

with film material any multiple of 24 works great and for video any multiple of 30 works. This is where a VP helps out a lot.

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Phil Smith



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PostLink    Posted: Wed Jun 18, 2008 8:10 pm    Post subject: Reply with quote

As afar as refresh rates go, I think an HTPC can pretty much do what a VP can do, if not more.

For whatever reason, 30Hz DVDs didn't seem to play smoothly at any of the refresh rates that were multiples of 24Hz, but 24Hz DVDs played smoothly at 60Hz. So I've got both covered by running 60Hz.

It's just not video DVDs that are 30Hz. I'm not sure why, but many film documentaries are also 30Hz. I think some (or all) of the film TV shows on DVD are also 30Hz, such as The Sopranos, Deadwood and Dexter.
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AnalogRocks
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PostLink    Posted: Thu Jun 19, 2008 5:39 am    Post subject: Reply with quote

[quote="Phil Smith"]As afar as refresh rates go, I think an HTPC can pretty much do what a VP can do, if not more.

For whatever reason, 30Hz DVDs didn't seem to play smoothly at any of the refresh rates that were multiples of 24Hz, but 24Hz DVDs played smoothly at 60Hz. So I've got both covered by running 60Hz.

It's just not video DVDs that are 30Hz. I'm not sure why, but many film documentaries are also 30Hz. I think some (or all) of the film TV shows on DVD are also 30Hz, such as The Sopranos, Deadwood and Dexter.[/quote]


Now that's interesting. I would have figured they were shot at 24fps. Maybe after the telecine they just went ahead and dumped them to DVD at 30fps...

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