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Create custom near-72 Hz refresh rates to get closer to 24 Hz...

E-waste
By E-waste
in Displays
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Do you think most DVDs are designed to be displayed frame-for-frame at 60 Hz, with some built-in encoding, or, would it be nice to get as close to 23.976 Hz as possible for smoother motion?

 

Basically all displays use 60Hz, so maybe dvd publishers etc set it up to properly show smooth motion at standard rates, because an extremely low minority will ever get near 23.976 / 24 Hz on their display.

 

I have set up a custom 1:1 960x540 resolution with as absolutely close as the cvt tool on Linux will allow.

 

First, I tried 48 Hz, but it was actually closer to 23.8 Hz, which is too far off if I'm going to go through the steps of custom refresh rates. So I settled on 71.7, which is 23.9 Hz.  I could also get just past 24.0something, would this be closer, if it was just slightly ahead, or would it be better to be slightly behind the timing?

 

It's as close as I can get, and will only be about one frame backward after some amount of frames passed, and I think it's close enough.

 

Is this a useful thing to do, or completely a waste of time, worsening the picture quality because the whatever needed is already setup for 60 Hz in the dvd?

: JRE #1914 Siddarth Kara

How bad is e-waste?  Listen to that Joe Rogan episode.

 

"Now you get what you want, but do you want more?
- Bob Marley, Rastaman Vibration album 1976

 

Windows 11 will just force business to "recycle" "obscolete" hardware.  Microsoft definitely isn't bothered by this at all, and seems to want hardware produced just a few years ago to be considered obsolete.  They have also not shown any interest nor has any other company in a similar financial position, to help increase tech recycling whatsoever.  Windows 12 might be cloud-based and be a monthly or yearly fee.

 

Software suggestions


Just get f.lux [Link removed due to forum rules] so your screen isn't bright white at night, a golden orange in place of stark 6500K bluish white.

released in 2008 and still being improved.

 

Dark Reader addon for webpages.  Pick any color you want for both background and text (background and foreground page elements).  Enable the preview mode on desktop for Firefox and Chrome addon, by clicking the dark reader addon settings, Choose dev tools amd click preview mode.

 

NoScript or EFF's privacy badger addons can block many scripts and websites that would load and track you, possibly halving page load time!

 

F-droid is a place to install open-source software for android, Antennapod, RethinkDNS, Fennec which is Firefox with about:config, lots of performance and other changes available, mozilla KB has a huge database of what most of the settings do.  Most software in the repository only requires Android 5 and 6!

 

I recommend firewall apps (blocks apps) and dns filters (redirect all dns requests on android, to your choice of dns, even if overridden).  RethinkDNS is my pick and I set it to use pi-hole, installed inside Ubuntu/Debian, which is inside Virtualbox, until I go to a website, nothing at all connects to any other server.  I also use NextDNS.io to do the same when away from home wi-fi or even cellular!  I can even tether from cellular to any device sharing via wi-fi, and block anything with dns set to NextDNS, regardless if the device allows changing dns.  This style of network filtration is being overridden by software updates on some devices, forcing a backup dns provuder, such as google dns, when built in dns requests are not connecting.  Without a complete firewall setup, dns redirection itself is no longer always effective.

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DVD Video is 720×480 at 29.970 fps for NTSC format or 720×576 at 25 fps for PAL format. TVs use 59.94 Hz, and DVD players transmit each frame twice.

 

For sources originating from 23.976 fps film, 3:2 pulldown is used to convert it to 29.970 fps for DVD Video. So this is already built into the images on the DVD.

 

Almost any monitor will already have a CTA-861 profile that runs at 59.94 Hz. Using CVT will not allow you get such an exact rate due to the requirement that the pixel rate be an even multiple of 250 kpx/s.

 

It may be more worth it to just make a custom resolution at 1920×960 (that is, 480×2 lines) then display it with aspect ratio scaling. You'll get thin black bars on top and bottom but then the 480-line image will be scaled 2:1 precisely (if you set scaling to maintain aspect ratio). And it can be based on the standard CTA-861 modeline.

  

$ xrandr --newmode "1920x960x60"  148.3515  1920 2008 2052 2200  960 964 969 1125 +hsync +vsync

 

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