Pulldowns drop_frame

[lpn1160]

Hope this is the right place for this post

Pulldown is one of those little utilities that one somehow can't seem to live without. It is truly a great little app.
All of the switches/options are pretty self explanatory, except for one. Drop_Frame. Does anyone know(I'm sure someone does) what it is, what it does, & when does one need &/or should use that option?
Just curious as I use pulldown for whatever else I need to do.
And of course it works superb!!

Thanks in advance

[BJ_M]

you can change the header from drop frame to non drop frame ... though there is rarely a reason to do so (changes the timecode to sync with some ac3 files with time stamps on them which are encoded ussually drop frame if for ntsc source)

drop frame only pertains to NTSC and honestly its a real mess sometimes ..

you can read about it here or in the glossary ..

http://www.adobe.com/support/techguides/digitalvideo/timecode/timecode.pdf
http://www.csif.org/html/dropframe.html

[SLK001]

Use "drop_frame true" whenever you have subtitles or closed captioning so that you maintain proper sync.

What "drop frame" does is to change the time index to remain true to the proper time marks, since the real framerate is not 29.97fps, but some other oddball number (but it rounds to 29.97). As the film runs, this "insignificant extra" becomes significant, so must be dealt with (by dropping a frame count and jumping up to the correct time index). Notice that no frames are dropped, just "times".

If you don't use the drop frame, you will notice a gradual loss of sync toward the end of the film.

[BJ_M]

SLK001 -- that is sorta true except for many CGI based films which are done at 30fps and laid to tape at NDF , subs for those would also be done at NDF ..

A lot of the HD stuff i do is also NDF

[lpn1160]

Thanxs all for shedding some lite on this topic