On Friday 31 May 2013 13.32:35 Carl Karsten wrote:
> On Fri, May 31, 2013 at 12:38 PM, j-b-m <j-...@users.sourceforge.net> wrote:
> > On Friday 31 May 2013 11.28:44 Carl Karsten wrote:
> >> #!/bin/bash -xe
> >> I am trying to create some test files, and would like to render a text
> >> file on a blue background.
> >> (so that it is noticeable when it flips to a read background and the
> >> noise stops .. like to testi AV sync.)
> >> 
> >> This is what I tried, but I get white source.txt on black, then #frame#
> >> on
> >> blue.
> >> 
> >> If it takes more then a min or two to figure out how to do what I
> >> want, I can dig up some red_blue.mlt xml that should work, but for bug
> >> reports I would like as simple as possible.
> > 
> > Hi,
> > 
> > 2 possible approaches. If you want a blue background, you can use the
> > "bgcolour" property of the pango producer:
> > 
> > (note that instead of a .txt file you can use "+" to directly output text:
> > 
> > melt +hello.txt bgcolour=blue
> > 
> > will output hello on a blue background, but the aspect ratio of the
> > background sometimes needs adjustment.
> > 
> > Otherwise, using your 2 tracks way, you need to add a transition to see
> > the
> > blue background track:
> > 
> > melt color:blue -track +hello.txt -transition composite always_active=1
> > halign=centre valign=centre
> 
> perfect - thanks a bunch.
> 
> another quickie...
> does something (pango?) look at the file name ext to figure out how to
> decode it?
> 
> I tried to swap source.txt with $0, but then I just get white on white.


Yes, the loader producer matches the extension with the list that is installed 
at $INSTALL_PREFIX/share/mlt/core/loader.dict

If no match is found, it defaults to the avformat producer. You can force a 
producer by specifying it at the command line:

melt pango:+hello

regards
jb



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