Whats the Difference between..

Rebel_X · March 19th, 2003

The question is, What is the Difference between 30FPS from 60FPS NTSC, and 25 from 50 PAL???

As noticed, VGS using 25 or 30 FPS, using FRAPS util. and Lewpy Plugins there is the Ability to Scale FramRate to 25/30 TV style.

And there is no Visual difference "SMOOTHER ANIMATION" I mean! If using TV FramRate. and I think Frame Rate like that is easily acheived!

Is it better or not? is Pete Plugins using 'em? are they the same as PC frame Rate Calculations game fix?

**Kane** · March 19th, 2003

Pete's plugins don't run at 60FPS IIRC, just 60 virtual updates, which is the same as the PSX.
Try using Fraps on that.

**Lewpy** · March 19th, 2003

We are getting in to trouble with definitions here

The PSX runs on a TV screen, which can either be NTSC or PAL.
NTSC and PAL both work in similar ways: they both interlace a displayed "frame", so that the odd lines are displayed on one scan, and the even lines are displayed on the next scan. These "scans" are refered to as "fields".
So, the rate of display of "fields" is 60hz for NTSC, and 50Hz for PAL. But the actual rate of display of whole "frames" is 30Hz for NTSC and 25Hz for PAL.

Now, the PSX can operate in interlaced mode, where it displays alternating lines from a display area of VRAM per field, and the non-displayed lines of VRAM can be updated per field as well. This effectively doubles the frame-rate, but does so by effectively halving the vertical resolution of the screen. But because the image is moving so quickly, the eye tends to compensate for this, and the image looks fine.

The FPS that both Pete and myself report in our plugins is actually the field rate: so 60 for NTSC, and 50 for PAL. Unless you enable one of our special fixes, which will revert it to trying to count the actual frame-rate (it's explained in each of the readmes).

Now, an actual PSX game tends to update the frame every other field in non-interlaced mode, so the effective frame-rate is 30/25 Hz. But it may be lower than this, depending on the game engine. Sometimes MDECs run at slower speeds (e.g. 20Hz).

jegHegy · March 20th, 2003

...and there are the lazyass coders who don't optimize their code making the game run at a VERY low FPS. -_- (see Front Mission 3 for example)

nyaa

Rebel_X · March 20th, 2003

Quote:

Now, an actual PSX game tends to update the frame every other field in non-interlaced mode, so the effective frame-rate is 30/25 Hz. But it may be lower than this, depending on the game engine. Sometimes MDECs run at slower speeds (e.g. 20Hz).

This explains why FF7 PAL MDECS works in Interlaced and its Just 15 FPS acutal Speed!!!

March 19th, 2003	#1 (permalink)
Rebel_X Smart Star Join Date: Sep 2002 Location: Chicago, Oak Lawn Posts: 764	Whats the Difference between.. The question is, What is the Difference between 30FPS from 60FPS NTSC, and 25 from 50 PAL??? As noticed, VGS using 25 or 30 FPS, using FRAPS util. and Lewpy Plugins there is the Ability to Scale FramRate to 25/30 TV style. And there is no Visual difference "SMOOTHER ANIMATION" I mean! If using TV FramRate. and I think Frame Rate like that is easily acheived! Is it better or not? is Pete Plugins using 'em? are they the same as PC frame Rate Calculations game fix? __________________ "Logic is the Art of going wrong with confidence"

March 19th, 2003	#2 (permalink)
Kane 邪魔ゎ指せない Join Date: Jan 2002 Location: Gosport, England Posts: 26,255	Pete's plugins don't run at 60FPS IIRC, just 60 virtual updates, which is the same as the PSX. Try using Fraps on that. __________________ >Site Live< Pop over to my site for help with setting up PSX emulators. Help for the Final Fantasies and other RPGs avalaible Celes: (Desktop) Athlon 64 X2 4200+, 2Gb 400MHz DDR Ram, MSI K8N Platinum, GeForce 8800 GTS 320Mb, 500Gb RAID HDD, Vista Business Erika: (MCPC) Athlon XP 2400+, 1Gb 400MHz DDR Ram, geForce 6800 256Mb, 80Gb Hdd, XP 2005 MCE Kimiko: (Desktop 2) Athlon 64 3000+, 512Mb 400MHz DDR Ram, Asus K8V, geForce 6800 128Mb

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March 19th, 2003	#3 (permalink)
Lewpy Emu author Join Date: Apr 2001 Location: Southern England Posts: 519	We are getting in to trouble with definitions here The PSX runs on a TV screen, which can either be NTSC or PAL. NTSC and PAL both work in similar ways: they both interlace a displayed "frame", so that the odd lines are displayed on one scan, and the even lines are displayed on the next scan. These "scans" are refered to as "fields". So, the rate of display of "fields" is 60hz for NTSC, and 50Hz for PAL. But the actual rate of display of whole "frames" is 30Hz for NTSC and 25Hz for PAL. Now, the PSX can operate in interlaced mode, where it displays alternating lines from a display area of VRAM per field, and the non-displayed lines of VRAM can be updated per field as well. This effectively doubles the frame-rate, but does so by effectively halving the vertical resolution of the screen. But because the image is moving so quickly, the eye tends to compensate for this, and the image looks fine. The FPS that both Pete and myself report in our plugins is actually the field rate: so 60 for NTSC, and 50 for PAL. Unless you enable one of our special fixes, which will revert it to trying to count the actual frame-rate (it's explained in each of the readmes). Now, an actual PSX game tends to update the frame every other field in non-interlaced mode, so the effective frame-rate is 30/25 Hz. But it may be lower than this, depending on the game engine. Sometimes MDECs run at slower speeds (e.g. 20Hz).

March 20th, 2003	#4 (permalink)
jegHegy Registered User Join Date: May 2001 Location: Hungary Posts: 2,184	...and there are the lazyass coders who don't optimize their code making the game run at a VERY low FPS. -_- (see Front Mission 3 for example) nyaa