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@cadsoft.de To: vdr@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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