On Fri, Feb 18, 2005 at 11:31:32PM -0800, Corey Hickey wrote:
Corey Hickey wrote:
It's been a while and the telecine howto I wrote is out of date. Here's a patch.
* Added instructions for pullup,softskip. * Removed description of pullup's shortcomings (just use softskip). * Instructions to use "." for frame-step. * A few clarifications. * One grammatical fix (I think).
-Corey
I just realized that I should be using 24000/1001 in my examples instead of 23.976. For that matter, 23.976 is used througout the mencoder documentation.
If 24000/1001 is indeed correct, then all the docs should be updated. Instead of just 'sed -i s:23.976:24000/1001:g mencoder.xml' it would probably be nice to explain where all the weird numbers come from, either in our own words or by linking to an external page.
I'll do the work, except that I really don't understand it myself and I couldn't dig anything up on google. Can somebody explain it to me or give me a URL?
Thanks, Corey
My understanding is that 60000/1001 is just the only rational number within the range of tolerance of the NTSC refresh clock, without having a ridiculously huge denominator. Thus it was standardized as the "official" refresh for NTSC with the advent of digital video. 30000/1001 and 24000/1001 are just the refresh converted from fields to field-pairs or telecined frames. I'm sure you can find better references on this somewhere if you like... Rich