plem

How hard the most basic questions can be....

This patch contains a movie player, a jit.gl.pix fader and a videoplane.

I can set the size and hor+vert resolution with the scale objects, of cause.

But what forces the natural resolution (with the scales on 1)?

In other words: where can I control that resolution? (Because it seems better to have the right resotoins immediately in stead of correcting them later.)

PLresTest 1.maxpat

This patch contains a movie player, a jit.gl.pix fader and a videoplane.
I can set the size and hor+vert resolution with the scale objects, of cause.
But what forces the natural resolution (with the scales on 1)?
In other words: where can I control that resolution? (Because it seems better to have the right resotoins immediately in stead of correcting them later.)

How hard the most basic questions can be....
This patch contains a movie player, a jit.gl.pix fader and a videoplane.
I can set the size and

where-does-the-resolution-come-from-in-this-hit-gl-rendervideoplane-siting

First, don't think about resolution. Think instead in space units (meters, inches, whatever you prefer).

Your video, whatever its resolution and proportion, is being shown as a texture on a videoplane object in OpenGL's virtual 3D space. So, suppose that:

- the videoplane is at position 0. and has a scale of 1. 1. 1. (the dimension is 2, as it goes from -1 to 1);

- the jit.gl.render camera position is 0 0 1 and the lens angle is 90;

- then the videoplane dimensions will exactly fill the vertical space.

image.png

It all depends.
First, don't think about resolution. Think instead in space units (meters, inches, whatever you prefer).
Your video, whatever its resolution and proportion, is being shown as a texture on a videoplane object in OpenGL's virtual 3D space. So, suppose that:
- the videoplane is at position 0. and has a scale of 1. 1. 1. (the dimension is 2, as it goes from -1 to 1);
- the jit.gl.render camera position is 0 0 1 and the lens angle is 90;
- then the videoplane dimensions will exactly fill the vertical space.

So scaling the image to the screen with scale isn’t really a loss of quality, as understand.

One question remains. Why doesn‘t a HD video, played in the movie of my samplepatch shows as 16x9 in the jit.window? (In my case it is always 4x3.)

Makes sense! Thanks.
So scaling the image to the screen with scale isn’t really a loss of quality, as understand.
One question remains. Why doesn‘t a HD video, played in the movie of my samplepatch shows as 16x9 in the jit.window? (In my case it is always 4x3.)


With that being said, in the common situation you just want to show video fullscreen with automatic proportion correction, there are easy ways to do it, such as this:

"jit.gl.videoplane @transform_reset 2" automatically adjusts the videoplane to fill the screen.

"jit.gl.cornerpin @preserve_aspect 1" can adjust the size and preserve the aspect ratio of the video.

"jit.world" also has a similar feature built-in.

With that being said, in the common situation you just want to show video fullscreen with automatic proportion correction, there are easy ways to do it, such as this:
"jit.gl.videoplane @transform_reset 2" automatically adjusts the videoplane to fill the screen.
"jit.gl.cornerpin @preserve_aspect 1" can adjust the size and preserve the aspect ratio of the video.
"jit.world" also has a similar feature built-in.


Anyway, just to finish the explanation, a jit.gl.videoplane could be used to show the video correctly, by manually adjusting the scale according to the video proportion:

... meaning video is X times wider than it is taller...

Anyway, just to finish the explanation, a jit.gl.videoplane could be used to show the video correctly, by manually adjusting the scale according to the video proportion:
4:3 = 1.33 (scale 1.33 1. 1.)
16:9 = 1.777 (scale 1.777 1. 1.)
... meaning video is X times wider than it is taller...

Thanks. That is already quite helpful. I can live with that.

Although the principal question remains: Why is it necessary to tell the system specifically to keep the aspect ratio? So somewhere the original movie the system wants to transfer the 16x9-video to 3x4. Where does that happen? Is that a max standard somewhere? (And this all in the texture-gl-world of cause.)

But as said, this is only curiosity. I 'm in business again. Thanks a lot.

Thanks. That is already quite helpful. I can live with that.
Although the principal question remains: Why is it necessary to tell the system specifically to keep the aspect ratio? So somewhere the original movie the system wants to transfer the 16x9-video to 3x4. Where does that happen? Is that a max standard somewhere? (And this all in the texture-gl-world of cause.)
But as said, this is only curiosity. I 'm in business again. Thanks a lot.

where does the resolution come from in this hit.gl.render/videoplane siting?