Stefan, I think you are doing a bit of confusion.
When you are using Proxy the Scale factor is used for scale down that
video. Your 4k (3840x2160) video, with Scale=1/3 will be scaled to
1920x720, not 640x360.
Cinelerra-GG don't know you are using a different Project format
(1920x1080) and it is right so.
The Z value of the Camera tool don't use pixels but rate. It doesn't
matter if Proxy is enabled or not. When Z=0.5 (50% if we want to see it
in percentage), the frame will be scaled (up, if Z >1, or down, if Z<1)
of that value.
It is different for X and Y because them use pixels but the values are
switched to the ProjectFormat/ProxyScale.
When Proxy is enabled, if you want open a clip in the Viewer, you must
dragging and dropping (or double click) that clip from Resources/Proxy,
not from Resource/Media.
Because your project is 1080p size and you are using a 4k video, the
Viewer shows that clip zoomed. The Viewer window aspected a 1080p video,
not 4k video. There is a fantastic Workaround for that (... and Thanks
GG!!!).
Before I write the Workaround, had you thought of one of the two ways
below (sorry if I allow mysef)?
1.
Using a Project format size for 4k and working onit with Proxy
(Scale=1/6?). Rendering out to 4k and, after, converting the Final video
with a tool (Handbrake?) or with Cinelerra-GG.
2.
Converting your video from 4k to 1080p before loading that video in
Cinelerra-GG. You will gain performance after. but loose time for
converting.
Yes, for #1 and #2, you waste time for conversion.
==================
=== Workaround ===
Start from an empty Project 1080p.
- In Resources/Media RMB (Right Mouse Button) on the clip icon.
- Select "Info..." option.
- In Asset info window on "Video:" section, click on "Resize" button and
change the Scale to 0.500x0.500.
- Enable/Set Proxy.
Remember:
when Proxy is enabled you must drag &drop (or double click) from
Resources/Proxy, not from Resources/Media, to load that clip in the Viewer.
==================
Sorry for the long texts.
I have to go for a drink because of dry throat. ;-)
IgorBeg
Il 29/01/2022 14:34, Stefan de Konink via Cin ha scritto:
In my curious "document everything you don't understand in
Cinelerra"-adventure. I have now content that is shot in 4K. For speed
purposes I am (usually) successfully using the proxy functionality.
The proxy is configured to 1/3 of the size (640x360).
Problem 1;
With the proxy *enabled* I drag a video in the timeline.
Since my target format is 1080p I reduce the size of the camera on the
video track to Z=0.170 to see the full frame (using the proxy). But
when I disable the proxy, the Z value should be set to 0.500 to fill
the frame.
If I would instead *disable* the proxy, drag a video in the timeline.
Set the Z value to 0.500, I am able to start the proxy and get the
desired effect that I want: both proxied video and original video are
of the same size in the compositor.
Problem 2;
When the proxy is disabled, the viewer shows the clip in the original
resolution. I think this is expected. Now when I enable proxy editing,
and then open the same clip in the viewer, the resolution is scaled
(zoomed in). It feels like this is all related to the output
resolution being 1080p, scaling is applied to the proxy, and the meta
data is not used consistently. ... ... ... Nope. It shows it in 1080p,
the project resolution. This is not expected from a viewer in my opinion.
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