Hi,
I'm trying to use a Blackmagic Design DeckLink Mini Monitor. MLT provides
me output. Idealy I would like to have a way to continously loop the
inputscript. I read that that a "high" repeat would emulate a loop best.
/opt/mlt/bin/melt -profile dv_pal_wide eof=loop /home/tv/kabelkrant.mlt
-repeat 1000000 -consumer decklink
The above functions. I am using a moving background and a png to overlay
ontop of it.
<?xml version="1.0" ?>
<mlt>
<!-- clip -->
<producer id="clip1">
<property name="resource">/home/tv/test.png</property>
</producer>
<producer id="clip2">
<property name="resource">/home/tv/logo.png</property>
</producer>
<!-- cg -->
<producer id="cg">
<property
name="resource">/home/tv/FGTV_ACHTERGROND_10.mp4</property>
</producer>
<!-- cg loop -->
<playlist id="clips">
<entry producer="clip1" in="0.0" out="400.0" />
<entry producer="clip2" in="400.0" out="800.0" />
</playlist>
<playlist id="cg_loop" eof="loop">
<entry producer="cg" eof="loop"/>
</playlist>
<tractor eof="loop">
<multitrack>
<track producer="clips" in="0.0" out="800.0"/>
<track producer="cg_loop" in="0.0" out="800.0"/>
</multitrack>
<!-- clip and cg blending -->
<transition in="0.0" out="800.0">
<property name="mlt_service">composite</property>
<property name="a_track">1</property>
<property name="b_track">0</property>
<property name="fill">1</property>
</transition>
</tractor>
</mlt>
Now the output looks bad, and I mean: linear scaling bad. I wonder, how
does MLT currently make wide-screen pal, or scaling at all? At what step
does it downscale to anamorphically 720x576?
I see that the larger the input resolution is, the worse edges become at
the output. Any pro tips? Is it for example possible to have the tractor at
HD resolution and have the consumer downscale it?
And a more pragmatic question: is it possible to use VDPAU in combination
with Decklink output? Or is the idea stupid, and is it much better to use a
DVI->HDMI->SDI conversion?
--
Stefan
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