If you want a side-by-side view and don't mind a lot of black padding:
melt -profile hdv_720_25p color:black -track noise: -track
~/Movies/bbb_youtube_h264_499kbit.mp4 -transition composite a_track=0 b_track=1
geometry="0/0:50%x100%" fill=1 valign=middle -transition composite a_track=0
b_track=2 geometry="50%/0:50%x100%" fill=1 valign=middle
Note the use of a black background track onto which to compose the 2 sources.
If you do not want all of that padding, then you need to make the output aspect
twice as wide as the 16:9 sources.
Thanks Dan - that works great and it really helps me understand what's
going on with the track paradigm. We now have all we need to implement a
solution for our project - I just need to do the app to log clips into our
database and then the app which will use that data to create the Melt XML
needed to produce the assembled videos (I've already created and tested
templates for Melt to produce the various outputs we need). I'm beginning to
see the power of MLT/Melt and I think we'll end up using it a lot.
On Thu, Sep 18, 2014 at 9:54 AM, Keith Johnson <ke...@xentrik.tv> wrote:
On a more general note, it would be great if one of the higher-level edit
packages (kdenlive or shotcut) could export an .XML MLT file for a transition
from the timeline.
We would not do that for usability reasons. The UIs are already complicated
enough that we do not want to bloat them with esoteric things like this -
especially when you can simply make a concise composition representing only
what you need, save the XML, and view it.
I just realized that Shotcut already does what I want, as you describe. It
saves .MLT XML files which can then be loaded by Melt, so it's easy to create
quite complex composition templates which can then be easily scripted -
wonderful!
I also LOVE the way Shotcut is self-contained and portable. I'm working at a
broadcast company client of mine today where they have a crippled corporate
network running Windoze, so I had the bright idea of downloading the Win32
version of Shotcut to test your solution.
The Head of Technology here was amazed to see it running on one of their
machines alongside the clunky £10,000-a-seat edit software they use, and seems
very impressed with its capabilities and elegant interface. All I've got to do
now is see if I can persuade them to junk the ££££s name-brand
server/edit/playout system they have here and replace it with Melted/Shotcut!
Keith
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