[vtkusers] How to write AVI files properly, Please Help

[Janny Dong]

Beau, you said you didn't have size problem. You are saying your movie is
reasonably smaller?

I added Modified() before the line WindowToImage->update() as you suggested.
The movie still shows a single static image. :(

Janny

On 5/29/07, Janny Dong <janny.dong at gmail.com> wrote:
>
> Thanks, Beau. I tried to play with FFMPEG, but with no success. I am using
> MSVC, and unfortunately FFMPEG doesn't support it, so I couldn't get the
> library installed. My project requires automated movie generation. That's
> why I am struggling to get everything under control in my code. :(
>
> Janny
>
> On 5/29/07, Beau Sapach <beau.sapach at ualberta.ca> wrote:
> >
> >  I think I had a similar problem, not the size issue but the single,
> > static image issue.  Try calling Modified() on vtkWindowToImageFilter before
> > you call Update().  As for frame rate I don't know how to set that with
> > vtk's classes, I suggest you look at FFMPEG, it can be built into VTK but
> > I've had little luck doing so.  Currently I write out image files and have
> > my application call the ffmpeg executable to encode the images as a movie,
> > using ffmpeg command line options you can control framerate.
> >
> >
> >
> > Beau
> >
> >
> >  ------------------------------
> >
> > *From:* vtkusers-bounces+beau.sapach= ualberta.ca at vtk.org [mailto:
> > vtkusers-bounces+beau.sapach=ualberta.ca at vtk.org] * On Behalf Of *Janny
> > Dong
> > *Sent:* Tuesday, May 29, 2007 8:24 AM
> > *To:* vtkusers
> > *Subject:* [vtkusers] How to write AVI files properly, Please Help
> >
> >
> >
> > I posted a similar question but didn't get any answer, probably I didn't
> > make it clear enough.
> >
> > I am coding a C++ program to visualize my data and generate movie
> > automatically. I put vtkAVIWriter in a loop to get a movie out of the
> > rendering. It did get an avi file, but not the one I expected. I have two
> > questions about it.
> >
> > (1) The size of the movie file is 18MB, but it has only 50 frames.
> > Moreover, it is only 3 second long. Can I compress the movie file with
> > vtkAVIWriter? How can I control the speed of the movie, like specifying
> > number of frames per second?
> >
> > (2) I found the avi file displayed only one frame like a static image.
> > However, I did update the data when rendering each frame. The data rendering
> > part in my program is like
> > data
> > points--->vtkPolyData--->vtkDelaunay2D--->vktPolyDataMapper--->vtkRenderer--->vtkWin32OpenGLRenderWindow->SetOffScreenRendering(1)--->vtkWindowToImageFilter--->vtkAVIWriter
> >
> >
> > I have something like: PolyDataMapper->update(); WindowToImage->update()
> > in my code.  Did I call update() in a wrong way or should I call it in
> > different parts of the code?
> >
> > Any suggestions will be greatly appreciated.
> >
> > Janny
> >
> >
>
>
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