Hello
I'm not sure that's what you want to end up with but here is an example with
- your three producers for bike.png, white.png and black.png
- an entry for each producer
- each entry is passed through a brightness filter to alter the alpha
channel.
- I'm setting up a multitrack which comprises of
* one multitrack with two tracks : one for bike, one for white, and a
frei0r.dodge transition btw them
* a track with black
- there's a composite transition between the bike/white multitrack and the
black track
<mlt LC_NUMERIC="en_US.UTF-8">
<producer id="1">
<property name="resource">bike.png</property>
</producer>
<producer id="2">
<property name="resource">black.png</property>
</producer>
<producer id="3">
<property name="resource">white.png</property>
</producer>
<tractor>
<multitrack>
<tractor>
<multitrack>
<tractor>
<playlist>
<entry producer="1" in="0" out="499">
<filter>
<property name="mlt_service">brightness</property>
<property name="level">0.5</property>
<property name="alpha">-1</property>
</filter>
</entry>
</playlist>
</tractor>
<tractor>
<playlist>
<entry producer="3" in="0" out="499">
<filter>
<property name="mlt_service">brightness</property>
<property name="level">0.5</property>
<property name="alpha">-1</property>
</filter>
</entry>
</playlist>
</tractor>
</multitrack>
<transition>
<property name="mlt_service">frei0r.dodge</property>
<property name="a_track">0</property>
<property name="b_track">1</property>
</transition>
</tractor>
<tractor>
<playlist>
<entry producer="2" in="0" out="499">
<filter>
<property name="mlt_service">brightness</property>
<property name="level">0.5</property>
<property name="alpha">-1</property>
</filter>
</entry>
</playlist>
</tractor>
</multitrack>
<transition>
<property name="mlt_service">composite</property>
<property name="a_track">0</property>
<property name="b_track">1</property>
</transition>
</tractor>
</mlt>
To summarize :
- you can attach a filter directly to an entry with
<entry><filter></filter></entry>
- to apply a transition to two tracks use
<multitrack><tractor><playlist></playlist></tractor><tractor>
<playlist></playlist></tractor></multitrack><transition></transition>
Hope it helps
Geoffroy
2016-05-02 19:13 GMT+02:00 Nahuel D <ndefo...@machinalis.com>:
> Hi,
> we're trying to create blends similar to this CSS code in MLT XML file:
>
> .lark {
> -webkit-filter: contrast(0.9);
> filter: contrast(0.9); }
>
> .lark::after {
> background: rgba(242, 242, 242, 0.8);
> mix-blend-mode: darken; }
>
> .lark::before {
> background: #22253f;
> mix-blend-mode: color-dodge;
> }
>
> This requires a applying a blend mode to the result of another blend mode.
> We've played with Flowblade, but the resulting XML does not seem to be
> applying the blends in a chain.
> We need to apply a blend mode to the result of a previous blend. Can we
> achieve this in a single XML file?
> We could pre-process each clip but this would require 3 runs (or maybe 2),
> slowing things down.
>
> We've been thinking that if we could take the result of a tractor and use
> it as producer/source for another blend, this could solve our problem.
>
> This a graphical idea of what we'd like to create with MLT XML:
>
> https://drive.google.com/file/d/0B_iCdl50i5rzcmNxbHNub1EzMHM/view?usp=sharing
>
> Thank You in Advance
>
>
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