[vdr] Frames per second PAL vs. NTSC

Timothy D. Lenz tlenz at vorgon.com
Tue Jan 6 04:42:56 CET 2009


Maybe these links will help:

http://cnyack.homestead.com/files/modulation/ntsc_sig.htm
http://en.wikipedia.org/wiki/Frame_rate
http://en.wikipedia.org/wiki/NTSC
http://www.afterdawn.com/glossary/terms/ntsc.cfm
http://www.fixya.com/support/t174610-ntsc_frame_rate_29_97_hz

----- Original Message ----- 
From: "Klaus Schmidinger" <Klaus.Schmidinger at cadsoft.de>
To: <vdr at linuxtv.org>
Sent: Monday, January 05, 2009 3:31 AM
Subject: [vdr] Frames per second PAL vs. NTSC


> In order to correctly handle the progress indicator for NTSC
> recordings I'm now determining the frame rate from the
> actual data. With PAL's 25 frames per second the distance
> between two frames is 3600 "ticks" of 1/90000s. With NTSC
> this number is 3003, which results in 29.97002997003 fps.
> Is NTSC's frame rate really that "odd"? I thought it would
> be an even 30 fps.
> 
> Klaus
> 
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