On Sun, Jun 12, 2016 at 6:00 PM Grant Edwards <grant.b.edwa...@gmail.com>
wrote:
> On 2016-06-13, Carl Karsten <c...@personnelware.com> wrote:
> > On Sun, Jun 12, 2016 at 7:34 PM, Grant Edwards <
> grant.b.edwa...@gmail.com> wrote:
> >
> >> It looks like I could use -transition and ramp gamma and audio gain to
> >> do the same thing, but then (AFAICT) I need to know the frame numbers
> >> where I want to start/end the fade out.
> >>
> >> Can you somehow index back from the end of a clip (e.g. frame 1 is the
> >> first frame; frame 2 is the second frame; frame -1 is the last frame,
> >> frame -2 is the frame before the last frame). Then transitions could
> >> be applied to the end of a clip without having to know how long it is.
> >>
> >> All the examples I find of applying a transition to the end of a clip
> >> require knowing how long it is.
>
not when using -mix...
> >>
> > This sounds familiar - for sure I have wanted it for a while.
>
> I'm _guessing_ it's not feasible because most of the "things" in MLT
> just perform operation sequentially on streams of frames and have no
> concept of where the end of something is or any way to move backwards
> or forwards in the stream. They can start counting frames from the
> first one they see on their input and do stuff when they hit certain
> certain counts, but they don't have any concept of the end of
> something.
>
>
Property animation supports a negative time values to mean from the end of
a clip:
https://www.mltframework.org/bin/view/MLT/PropertyAnimation
However, only some properties of some effects support animation (or
geometry animation). See the bottom of that page. Note to self to review
that list against git log to see if there are some additions.
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