From: Dan Dennedy <dan@de...> - 2010-03-10 17:46:05
On Wed, Mar 10, 2010 at 9:02 AM, Oleksandr Bondar <obondar@...> wrote:
> Hello Dan,
> I am developer of website zeodia.com.
The design of your site is very nice.
> We use MLT framework in our application to generate video stories.
> Would like to ask you few question about using MLT.
Please always use the mailing list unless you are paying for private advice.
> Now we end up with video effects quality problem.
> Here is the example of our video: http://zeodia.com/stories/215
> The problems:
> - moving picture are jumping left-right, you can see the artefacts at the
> right side. White line that appear and disappear.
It is a well-known issue that MLT provides no smooth pan and zoom
effect at this time. It is already very high on the ToDo list, but I
have other commitments over the next 2 months.
> - scale begin to work after transition, but it should be also while
I do not know because you did not share with me how you are creating
it. However, if you do share, I would tell you that it is pointless to
address because there is no smooth pan and zoom effect. :-)
> Is it possible to fix this? If yes, where to search for solution?
> And the main our question about MLT is next:
> can we build video like this one (http://studio.stupeflix.com/?noredir=3)
> with MLT?
Hmm, well assuming you do not use smooth pan/zoom for the embedded
photo, it is easy to composite an animation with an alpha channel
assuming you have a means to create animation with alpha channel.
Typically, that animation will be in QuickTime Animation format, or an
image sequence of PNG or TGA. It is also possible to convert a Flash
animation into an image sequence. The next problem is to get the
embedded photo to move in synchronization with the animation. First of
all, the motion will not be smooth for the same reason that pan/zoom
is not at the moment. Beyond that, however, it is possible to keyframe
the compositing rectangle (a.k.a. geometry) and save that somewhere as
a motion path for each animation.
In summary, all of what you want to do is possible today, just not yet
with satisfactory results, which is not a trivial "fix." I do expect
to address all of these sometime in 2010.
> Thanks in advance,