Using the route described above, you can grab an image from a frame in a post-draw callback and write it to a file regardless of its size and aspect ratio I think, since it is not used as a texture. Any video editing tool (not just AVID) should be able to grab a sequence of frames and make an AVI out of it. I am sure even Window's Movie Maker, the free one that comes with XP will do that.
I also ran across a little snippet of code somewhere that you could use to write out an AVI, and even asks for what compression you want using the CODECs installed. I might be able to dig it up if you are interested. The part about running with a constant framerate is critical too, because it takes quite a bit of processor/disk to do it all and the animation will not be smooth.
-- Rick
On 11/9/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
When we're putting together promo videos, we just dump out each frame as a
tga then use Avid to edit the sequence and turn it into a useable video.
Admittedly we have a high-end Avid suite for this, but the dumping of the
frames goes from the PS3, down the network and onto our PCs. We run at
about 1 fps, but you can capture quite a lot of video by letting it run
overnight. In our case, we have several machines capturing different parts
of the game, then let the video guys sift through it all.
There's no reason why you couldn't set up a 512x512 render target at the
top of your scenegraph, change the aspect ratio to that of 720x480 (3:2)
so it appears stretched (or if your card supports non-power-of-two
textures, then you can do it at native resolution), then dump out each
frame to an image file. I don't have any code to hand, but OSG can cope
with that easily. When you come to encode it, you can stretch it back to
the desired resolution. Oh, and don't forget to make your animation
dependent on framerate (i.e. assume you're running at a constant
framerate), so the animation runs smoothly at full speed; otherwise you'll
pick up any variation in rendering speed.
To put it all together, Avid did a home edition of their video editing
software that was free to download and is fairly powerful, but I can't
find it on their page, maybe they stopped doing it. If you're on Linux,
there's a free bit of software for video editing, called Cinelerra
(http://heroinewarrior.com/cinelerra.php3). If you want to automate the
process, and you use Linux, Transcode
(http://www.transcoding.org/cgi-bin/transcode) will import individual
frames and spit out a video in a bunch of different formats. It might take
some time to set up to your liking, but it'll happily cope with most
things you can throw at it; it'll even mux any audio you might want to
use.
John Donovan
Sony Computer Entertainment Europe
http://www.scee.com
[EMAIL PROTECTED] wrote on 09/11/2006 00:45:14:
> Hello,
>
> PLEAAAAAAAAASE!
> Does anybody have a way to automatically create an mpg or avi from an
OSG
> fly through? So, that it plays back in real-time?
>
> Basically, I want to generate videos for demo purposes.
>
> ie.
> loop
> update frame
> render scene
> capture screen
> down convert screen capture to acceptable format (720x480)
> end loop
> concatenate screen captures into video file.
>
> Recommendations are also welcome.
>
> Thanks.
>
> Zach
>
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://openscenegraph.net/mailman/listinfo/osg-users
> http://www.openscenegraph.org/
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