@jb, thanks, very useful. Is it possible to capture video and audio directly from a webcam using melt in command line? Any pointers appreciated!
On 9/20/15, jb <j...@kdenlive.org> wrote: > 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 > ------------------------------------------------------------------------------ _______________________________________________ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
