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Rendering displaces Titles on image

Rendering displaces Titles on image

Postby Davidk » Wed Oct 23, 2013 11:29 pm

I have a project created in X6. In several places throughout the project file, there is title text overlaid onto an image. The project file shows the titles as centrally placed, but when rendered the titles are displaced to one side, usually the right when facing the screen.

To illustrate, this is a screen shot image of the project file centred on the opening title. It shows the whole UI and the actions taken to render the project to a video file.

VS u3a displaced title 2.jpg


The title is clearly centred on the screen, see the preview window. However, when its rendered and played back, finished item looks like this (played using media player):

VS u3a displaced title.jpg


Other titles are similarly displaced throughout the rendered project.

Does anyone know what causes this and how to fix it???

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Re: Rendering displaces Titles on image

Postby rwernyei » Thu Oct 24, 2013 12:36 am

Make sure your source files and project properties match aspect ratio (4:3 or 16:9) and when creating your file under Options make sure Perform non-square pixel rendering is checked.
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Re: Rendering displaces Titles on image

Postby lata » Thu Oct 24, 2013 5:16 pm

Hi David

Rwernyei mentioned Non Square Pixel Rendering certainly will / may be an issue here.

Generally with a mix of video, some requiring NSPR and others not may cause this problem.
As far as I know the title should be using NSPR

I notice you have used Same as Project Settings, check the project properties that NSPR is selected, I would think that is ok.

Then from the Create Video File window choose Options—make sure Perform Non Square……. Is selected.

As I mentioned some video may not require NSPR, but generally should be selected.
Regards Trevor
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Re: Rendering displaces Titles on image

Postby Davidk » Fri Oct 25, 2013 12:06 am

Working on it. Meanwhile, a query . . .

Non-square pixel rendering. I understand rendering, but what does "non-square pixel" mean in that context? I've tried searching the help index for it and there is simply no mention of the function let alone what it does.

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Re: Rendering displaces Titles on image

Postby lata » Fri Oct 25, 2013 9:08 am

Hi David

Some video types need to use “Non Square Pixel Rendering”
The words Non Square describe the pixel shape.

For Standard Definition the frame size will be 720 x 576 Pal and 720 x 480 for NTSC.
These sizes are used for both 4:3 and 16:9 widescreen.

Using a calculator you will see that nether the above are using 4:3 or 16:9 ratio.
The frame shape is achieved by using rectangular pixels, aka Non – Square.

Video for the internet, Flash for instance uses Square pixels. So the pixel dimensions reflect the shape.

HD video uses 1920 x 1080 now that is 16:9
HD video 1440 x 1080 needs Non Square to stretch to 16:9
Upload to web option uses 1280 x 720, again that is 16:9 and use square pixels.

Generally editing in the timeline requires Non Square Pixel Rendering

If you Google Non Square I am sure you will find more info.

Your TV can be set to a variety of views, widescreen, 4:3 panorama, auto scan , the frame being distorted to your selection, that is achieved afaik by non square pixels.
Regards Trevor
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Re: Rendering displaces Titles on image

Postby Davidk » Sat Oct 26, 2013 12:16 am

Hi Trevor,

Thanks for that. Interesting explanation.

By 'out of school' training I'm (was) an electronics engineer. Trained at the time when many uni lecturers thought that transistors, the new boy on the market, were a passing fad. So I'd been thinking of the way pixels were generated in the older style CRT displays - all circular. The electron beam used to fluoresce the phosphor coating on the screen was tightly focussed to a dot (circle), and in colour CRT displays the holes in the mask used to prevent colour spill/bleed over between the RGB spot phosphors at the same pixel location were also dots. What actual shape the colour generating elements (TFT transistors) that form pixels in modern flat screens are, is anyone's guess, but since modern usage has kept the older terminology I assumed a dot. Given the size of transistors in nanometer manufacturing, despite the definition of a pixel (smallest picture element) there would have to be a lot of TFT transistors for 1 pixel, so a dot was eminently feasible, indeed likely. Thus, "non-square" did not make a lot of sense since they all were originally 'non-square'. I had not related the term to processing the size of an image using pixels.

muchas gracias.

I've noted the default setting for this in VS is off. As a passing note, does the forum publish recommendations to users for the setting of the various parameters in the program, and why? I would think that it would almost be a best seller - as long as it was evident to a user eg when the account was set up.

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Re: Rendering displaces Titles on image

Postby lata » Sat Oct 26, 2013 1:50 pm

Hi David

The default setting for Non –Square Pixel Rendering is selected, “ON“ the box being ticked, for all versions of VS.

There are two options for NSPR, one via project properties, if this is deselected then it must have been done by the user, but will remain deselected till changed again.

The other is via Share Create Video File – from the Create Video File window click the Options Button NSPR is always selected, if changed/deselected will revert to being selected for a new project.
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Re: Rendering displaces Titles on image

Postby Davidk » Sun Oct 27, 2013 6:37 am

Hi Trevor,

A provoking response on several levels. So, treating them in order.

1. The original query post stemmed from a student of mine, and her project. She gave the project to me for inclusion in a term final DVD, and I rendered it, with the results shown. I used the responses as a learning exercise for her and others, in that I sent them the link to this topic thread to read (and try) and to understand the benefits of an account on the forum. Hence the earlier reference to 'working on it'. I haven't heard back from her yet. And given the topic advisories I also sent her a screen shot of the NPSR setting taken on my machine with her project loaded (basically, how to find it), attached, and you will see that the NSPR setting is 'off'.

U3a non-square pixels.jpg


I have a clear recollection of a 'eureka' moment having realised that there was an answer to the issue and it seemed that a simple control setting change and another render would fix it. And hence my remark about default. More on this later.

2. I have several versions of VS loaded on my desktop - X5 ultimate, and X6 Pro. Given your comments, I checked both for the NSPR setting and they were indeed both set. And having re-loaded the related project file using X6, after checking it stayed on. The advisory re NSPR was the first I knew of that function so when I first rendered it, the function would have been in its default state. So, assuming I have stuffed up somehow creating an image to find it for the student, and the project was rendered with that setting on, how would the displaced title text be generated with NPSR set? The images in the rendered video file clearly indicated offset titles.

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Re: Rendering displaces Titles on image

Postby lata » Sun Oct 27, 2013 9:32 am

Hi

The setting NSPR is associated with the project not the program.
If the project was created by your student then she had deselected NSPR saving the project will retain that setting.

Running that project on your machine would show that deselected as you are using her project.

NSPR should be selected for all your projects.

Some non-standard video, maybe a corrupt video may display incorrectly, very rare to find these problems, but nay require tweaking the NSPR option.
Regards Trevor
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