You got my clickbait? I got your attention.
Nothing on the internet mentions that Cinelerra is capable of editing 360
video's, but it certainly is: with the help of ffmpeg's F_v360 plugin.
Either creating the 360 content, or extracting it in a regular video.
So as you all already expected from my I was doing stuff with Cinelerra-gg
that likely nobody did before and noticed some particularities that I
really did not understand. My steps:
1. My project settings remain 1920x1080.
2. Just grab any equirectangular video bigger than your project size. The
one I got my hands on was 4096x2048.
In my project I want to use a part of this video as illustration of the
user experience. This would mean I need to project the equirectangular
projection into a flat projection.
3. For the plugin settings that would be input=0 and output=4.
What I noticed when I modulated the yaw was that I would never see the
entire view, then when rotating the back of the video would 'clip' at -180
degrees.
4. When changing the camera to Z = 0.469 (1920/4096) I was able to get a
360 degree rotatable camera.
5. Setting up d_fov = 120, the image would be closely mimicking the
experience.
Now what Cinelerra bring you from this point. Keyframing a property of the
plugin, and there it becomes interesting.
Plugin keyframes seem to give the control what we are looking for here. I
can set the yaw using "Generate keyframes while tweeking", but what I would
be actually looking for is the same set of curves that would be available
when changing x,y,z,opacity etc. How would I get interpolation working?
Could anyone elaborate how Cinelerra knows it can interpolate some of the
parameters, but not others?
And personally I think what is more fundamentally lacking in Cinelerra: a
timeline view analogue to Blender where any property can be placed in view:
where I would suggest to normalise the min and max to sensible properties
opposed to the current: stack everything on the track and break your
project by an unintended mouse click.
--
Stefan
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