[Bf-funboard] Dynamic scaling Render Res for VSE playback

[David McSween]

Yes I understand, I find that there is a break even point with scaling
dimensions, where efficiency degrades with scaling between 100% - 50%. But
increases below 50%, Perhaps its a function of even division, you obviously
know better than I.

I had assumed that the scaling was OpenGL already?

When I:
-add the video as a textured plane in 3D view then
-use a scene strip in the same scene's VSE,
the OpenGL plays just as fast as the unscaled source video (full 30fps) on
a Mac Book Pro.

If I use a transform Effect Strip to modify the original VSE source strip,
the fps drops to 14 fps.

Cheers
David

On Wed, Feb 11, 2015 at 6:55 PM, Antony Riakiotakis <kalast at gmail.com>
wrote:

> We have that in gooseberry and it works, but all effects misbehave.
> Current effect framework assumes that all input buffers have the same
> dimensions. We could use some sort of filtering instead - bilinear or
> even no filtering (take the nearest texel), but quality would degrade.
> Also I am just not certain if doing bilinear filtering would improve
> or decrease the performance. More tests are needed here. Alternative
> is to do all effect processing on GPU, where filtering comes for free,
> but that's an even bigger change.
>
> On 11 February 2015 at 05:11, David McSween <3pointedit at gmail.com> wrote:
> > I think we need better real time playback in VSE when system resources
> are
> > stretched.
> >
> > Today I was adding a title from 3D view over a video in the VSE.
> > At 100% render resolution I saw 30 fps playback, but this dropped to 4
> fps
> > when I struck the 3D title.
> >
> > The VSE preview shows the current FPS (differing from scene setting) so
> > Blender knows when to drop frames for playback.
> >
> > Next I scaled the percentage of render resolution to 25% (arbitrary
> value)
> > and played the shot with 3D, I saw 30 fps again.
> >
> > Could we add to the Playback menu (currently - AV Sync, Frame Dropping,
> No
> > Sync) Render Scaling ?
> >
> > Eg. When frame dropping is sensed drop Render Resolution to predetermined
> > minimum value, and scale preview to fill same space as before (zoom the
> 25%
> > render res up to 100% render res display size).
> >
> > This would retain real time animation preview which is better for
> animation
> > sync. I would expect to still drop frames but be more efficient with the
> > display buffer.
> >
> > Cheers
> > David McSween.
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