This IS the Avid L2: [Avid-L2] Re: What determines which frames are skipped on TC1 NTSC 23.98?

Monday, January 6, 2014

[Avid-L2] Re: What determines which frames are skipped on TC1 NTSC 23.98?

Drop frame skips the ;00 and ;01 frames of every minute except for the 10's of minutes. I'm aware of how that works this is related to which drop frame time codes that Avid skips in a 23.98 NTSC project. When the sequence time code is drop frame the A frame relationship changes as the drop frame offset accumulates. What I curious about is why the drop frame sequence skips the ;04 and ;09 frames when with a sequence time code in NDF it typically skips the :02 and :07 frames.

--- In Avid-L2@yahoogroups.com, Agustin Goya <agustingoya@...> wrote:
>
> Hi John,
>
> If I understand correctly your question, this migh help you.
>
> From http://www.dropframetimecode.org/
>
> In one hour, a 30FPS system produces 108 frames more than one running at
> > 29.97FPS. To reconcile this difference, two specific time code frame values
> > are dropped each minute (2x60=120), except every 10th minute
> > (2x60-2x6=108). The time code values dropped are specified as the first two
> > frames of a minute.
> > Thus, the time code label following 01:04:59:29 would be 01:05:00:02,
> > time code labels 01:05:00:00 and 01:05:00:01 don't exist.
> >
>
> Regards,
>
>
> Agustin Goya
> WANCAMP | POST
> +54-11-6545-2427
> http://www.wancamp.com.ar/
> http://www.linkedin.com/in/agustingoya/
>
>
> On Sun, Jan 5, 2014 at 7:17 PM, John Moore <bigfish@...> wrote:
>
> >
> >
> > When I watch the 30 frame code, usually NDF, on a sequence from an NTSC
> > 23.976 project it typically skips the :02 and :07 frames. Now I'm on a
> > project where the TC1 of the sequence is drop frame and it skips ;04 and
> > ;09. Is this because the sequence is drop frame and not the usual non drop
> > frame? The sequence begins at 00;59;50;00 so there is no 2 frame offset
> > between drop and non drop at the 1;00;00;00 point like there is when you
> > have a minute and a half of bars tone and slate. I have taken the sequence
> > and cut it into a new sequence in the 23.976 HD project so that has a
> > proper TC1 of 24 frame code but I'm curious if I'm on the right track as to
> > why the original sequence oddly skipped ;04 and ;09 frames.
> >
> > John Moore
> > Barking Trout Productions
> > Studio City, CA
> > bigfish@...
> >
> >
> >
>