On Fri, Jan 2, 2015 at 7:58 AM, Geoffroy Montel <
geoffroy.montel...@gmail.com> wrote:
> Hello
>
> All the best for 2015 to everyone on the list !!!
>
> Thanks a lot for your help Stephan. Both approaches you suggested do work.
>
> FYI, it looks like there are differences in rendering between the two :
>
> 1. if I use the webvfx filter, the definition of the resulting video looks
> better at smaller definition than with the producer.
> I don't really understand why, maybe it's because of the resolution of the
> window webkit uses is different between the producer and the filter. I
> tried setting meta.media.width and meta.media.height in the producer but it
> either crashes melt or generate garbage in the video.
>
If the MLT profile is using non-square pixels, then there will be aspect
ratio normalization by horizontally scaling the webvfx producer, which
always generates square pixels.
>
> 2. if I use the webvfx producer and uses CSS3 animations
> <http://www.w3schools.com/css/css3_animations.asp> in the HTML file, the
> timing and length of the animation is not respected. A 6 seconds or so
> animation only lasts 1 or 2 seconds. I don't have the same problem if I use
> the webvfx filter. I have no clue why :-)
>
>
CSS3 animation cannot work correctly regardless of producer or filter
because it lacks a seeking API. (Actually, there is a JavaScript API from
W3C in draft, but not available in Qt WebKit.) If it seems to be working as
a filter, then it is because you are getting lucky or not picky about the
timing. Here is an article with some more explanation.
http://www.shotcut.org/bin/view/Shotcut/HowToTumultHype
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