Matt Jordan wrote:
Hi all,
As I've mentioned a time or two, I'm trying to use Cinelerra to do
cartoon animation. One of the basic skills I'm trying to work out -
and one that I thought would be a cakewalk - is panning and zooming a
still image. I think I have the basic controls down, but my results so
far are atrocious.
If you want to see the trouble I'm having, it's in this post on my
sketch blog:
http://www.sketch.mattjordan.com/2007/10/30/cinelerra-more-pan-and-zoom-trouble-shooting/
To save time, I'm going to copy and paste my blog text as explanation:
This time I used a jpg image to see if that made a difference; it
didn’t. [Ed. note: I had previously used a png.] The pan and zoom
action is still jittery. What’s more, Cinelerra seems to be ignoring
my Z axis settings. What’s supposed to happen is this: image holds
for a second, then pans down, then holds for a second again, then
zooms in. You can see that there is no real hold at the bottom; the
zoom begins immediatley at the end of the pan down if not sooner. Yet
the keyframes for that positon (i.e., the end of the pan move) were
copied and pasted a second later, so there should be a hold for one
second.
The other factor here is that the original jpg image is larger than
the movie width. The movie width is 400 pixels, while the jpg is 500
pixels wide. I’m doing that so that the end of the zoom won’t
pixelate the jpg, but the jitters are much worse when I use this
technique. I’ve seen others do very nice still image zooming and
panning, so surely there must be a solution to this. I’d hate to
think that I’m going to have to do all of my panning and zooming
manually.
To give a little more specific info: There are 5 keyframes. 1 and 2
are duplicates and basically accomplish the hold at the beginning of
the clip. 3 and 4 are also duplicates and, I thought, would cause a
hold at the end of the pan down and before the zoom in, but you can
see the zoom in begins way too early. When I right-click on keyframes
3 and 4 in the timeline, they show identical settings for X, Y, and Z,
so I'm at a loss as to why it's zooming in there. But maybe the answer
to that will also shed light on why I'm getting such a horrible jitter
throughout the clip. I'm clearly doing something wrong.
Thanks in advance for any help and feel free to answer here or at the
blog post, which ever suits your fancy.
Matt Jordan
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Could you send me your project? Or an example project that has the same
effect.
I could take a look at the code and I might be able to fix it.
Bob van Loosen.
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