On Sunday, September 20, 2015 11:08:26 AM Zenny wrote:
> Hi,
>
> I came to learn a hard way that two video sources can be keyed with
> the following:
>
> # melt BACKGROUND:VIDEO in=400 \
> -track FORGROUND VIDEO in=450 \
> -filter chroma key=0x00ff0000 variance=0.45 \
> -transition composite
>
> However there are a few caveats:
>
> §1. How can one remove keyspills to around the keyed video from command
> line? §2. How to fine tune the keying like one can do with kdenlive in
> command line? Like adding blur, keyspill-mopup and so on?
The best way to find out is to do it in kdenlive, save the project, then open
it in a text editor. Kdenlive project files are in MLT's xml format.
Then, you can look at what MLT effects and parameters are used. Filters have a
<filter> tag, for example (extracted from a .kdenlive project file):
<filter id="sepia">
<property name="track">0</property>
<property name="u">75</property>
<property name="v">150</property>
<property name="mlt_type">filter</property>
<property name="mlt_service">sepia</property>
<property name="kdenlive_id">sepia</property>
<property name="tag">sepia</property>
<property name="kdenlive_ix">1</property>
</filter>
The filter id is the effect name for MLT, and the parameters are "u" and "v"
You can get infos about an MLT effect with:
melt -query filter=sepia
Hope it helps,
jb
------------------------------------------------------------------------------
_______________________________________________
Mlt-devel mailing list
Mlt-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/mlt-devel
