[vdr] Frames per second PAL vs. NTSC

Theunis Potgieter theunis.potgieter at gmail.com
Mon Jan 5 11:57:41 CET 2009


On 05/01/2009, Theunis Potgieter <theunis.potgieter at gmail.com> wrote:
> On 05/01/2009, Klaus Schmidinger <Klaus.Schmidinger at cadsoft.de> wrote:
>  > 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
>
>
> Yes
>
>  http://en.wikipedia.org/wiki/Frame_rate
>  http://en.wikipedia.org/wiki/NTSC
>

http://en.wikipedia.org/wiki/Sampling_frequency

Please do not always _assume_ that it is actually PAL or NTSC, since
PAL or NTSC defines colour encoding, but the most of the time the
usual frame rates are associated with the colour encoding. However
like I've stated before nvidia on their newer drivers output PAL on
60Hz (on the tv-out of the card), not even 59.94006Hz, or 50Hz like
PAL is supposed to be for interlaced. The older CRT TVs (interlaced
monitors) expect PAL to run 50Hz. You can confirm this with xvidtune.



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