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Author Topic: Subtitles cutting off
Richard May
Phenomenal Film Handler

Posts: 1057
From: Floral Park, NY USA
Registered: Aug 2004


 - posted 02-17-2018 07:34 PM      Profile for Richard May   Email Richard May   Send New Private Message       Edit/Delete Post 
I had already tried looking for it but couldn't find it in either.

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Stephan Shelley
Jedi Master Film Handler

Posts: 854
From: castro valley, CA, usa
Registered: Nov 2014


 - posted 02-17-2018 07:38 PM      Profile for Stephan Shelley   Email Stephan Shelley   Send New Private Message       Edit/Delete Post 
Should be in the configuration menu.

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Richard May
Phenomenal Film Handler

Posts: 1057
From: Floral Park, NY USA
Registered: Aug 2004


 - posted 02-17-2018 08:14 PM      Profile for Richard May   Email Richard May   Send New Private Message       Edit/Delete Post 
Sorry. I misread the post. I will try enabling the GDC subtitle engine. Projector is rendering now.

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 02-17-2018 08:23 PM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
Again, you could try to transfer one of the subtitle files to a PC and have a look (usually, double-clicking it will open it for viewing in a browser). If it's an Interop DCP, the subtitled DCP/CPL should be accompanied by a couple of folders, each one containing a TTF font file, and a subtitle reel XML file.

The vertical alignment reference can be changed from top, center, to bottom. The vertical position for the text baseline is given in percent of frame height from reference. That is, if vertical reference is from top, running text exactly on the lower border is done by aligning it '100% from top'. The same could be done by '0% from bottom'. Note that putting text there will cut of descenders even if no cropping is active, because the text position is referenced to the text baseline, while the descenders stretch out below the baseline.

So, if you have a chance to look into one of these files, check these values.

In order for the the projector to position these subs properly, it needs to know about the active area configured in the Macro - otherwise it would reference e.g. 90% from the top of a flat active area for a scope movie. That's why it is important to have the proper PCF selected.

A typical commercial scope DCP ('Moonlight') e.g. had one liners at 6% above bottom (94% from top), and the top line of two liners at 12% from bottom (88% from top).

e.g.

<Text HPosition="0" VAlign="bottom" VPosition="12">Hey, Mom.</Text>
<Text HPosition="0" VAlign="bottom" VPosition="6">- You can't stay here today.</Text>

- Carsten

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Richard May
Phenomenal Film Handler

Posts: 1057
From: Floral Park, NY USA
Registered: Aug 2004


 - posted 02-17-2018 08:27 PM      Profile for Richard May   Email Richard May   Send New Private Message       Edit/Delete Post 
I enabled the GDC subtitle engine and the subs are all correct now. Not sure why but it works. Thanks guys.

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 02-17-2018 08:32 PM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
Don't know the exact reason why the projector engine is wrong here - but when the GDC renders subs, it necessarily knows exactly the image dimension, a scope DCP will render to 2048/858 or 4096/1716. The subtitle engine then places the text according to the rules I explained above and renders it into the individual frames. The projector PCF is then irrelevant for the sub position reference, as the text has been burnt into the image. Only excessive vertical cropping can then cut off the bottom part of the image and text rendering.

- Carsten

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