[MPlayer-users] fps newbie question

D Richard Felker III dalias at aerifal.cx
Thu Mar 27 22:07:57 CET 2003

On Thu, Mar 27, 2003 at 02:13:36PM -0500, Yan Seiner wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> OK, another newbie alert question.
> I've been playing quite a bit with all sorts of options, and it's sort
> of starting to make sense, but the huge amount of underlying knowledge
> you have to have is just amazing.
> Could someone explain the various fps pitfalls?
> Here's what I'm doing (among other things):
> I have a collection of PAL tapes, and a digital PAL<->NTSC tape deck. 
> The tape deck converts the PAL tapes to NTSC for display on an ordinary
> NTSC TV.  I am capturing the resulting signal with a BT848 card.  I
> often get "duplicate frame" messages, and jerky motion, which I am
> assuming are the result of incorrect fps rates.
> I've tried to set frame rates to what I thought were reasonable numbers,
> but I end up with "video buffer overflow".  (What's that, anyway?  Not
> enough CPU horsepower?)
> Is there a reference somewhere that says:  PAL: xx FPS, NTSC: yy FPS,
> DVD: zz FPS.  Probably something more complicated than that, but that's
> the general idea.

Nope, it's that simple. PAL is 25 fps, NTSC is 29.97.

However, supposedly there's some sort of pseudo-NTSC mode used by some
multi-standard tape decks to display PAL on NTSC TV's. It might use a
slightly different framerate. Someone posted about that a few days ago
here I think...


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