Search found 18 matches

by HaroldHallikainen
Sun Jun 11, 2023 9:41 pm
Forum: DCP-o-matic
Topic: Why is 2 frame gap between subtitles recommended?
Replies: 11
Views: 1719

Re: Why is 2 frame gap between subtitles recommended?

Though I don't recall the details leading to the 2 frame gap between subtitles, I believe most of the recommendations in the document are due to issues with some equipment based on ISDCF tests. In designing the USL/QSC closed captioning equipment, I had to deal with zero frame gaps between captions....
by HaroldHallikainen
Mon Mar 27, 2023 5:52 am
Forum: DCP-o-matic
Topic: on / off subtitles?
Replies: 4
Views: 653

Re: on / off subtitles?

Isn't just creating a DCP with two CPLs, one with subtitles and one without? Projectionist selects the correct one at playback time
by HaroldHallikainen
Mon Feb 20, 2023 12:10 am
Forum: DCP-o-matic
Topic: Subtitle positioning: help required!
Replies: 23
Views: 5569

Re: Subtitle positioning: help required!

In the SMPTE tests, the main picture had a grid with lines every 5% (I think!). It was pretty easy to tell where the subtitle landed.
by HaroldHallikainen
Mon Jan 02, 2023 4:26 am
Forum: DCP-o-matic
Topic: Vertical positioning of subtitles & SMPTE standard versions
Replies: 10
Views: 2006

Re: Vertical positioning of subtitles & SMPTE standard versions

I agree with your test results. The big difference from the tests I analyzed was that the text was vertical. Most systems did vertical positioning based on the bounding box. One used the horizontal baseline of the top, bottom, or center character as appropriate. I believe they should be using the ve...
by HaroldHallikainen
Sun Dec 11, 2022 7:33 pm
Forum: DCP-o-matic
Topic: Vertical positioning of subtitles & SMPTE standard versions
Replies: 10
Views: 2006

Re: Vertical positioning of subtitles & SMPTE standard versions

Thanks for the comments! The SMTPE group was working on improving the rendering of Japanese subtitles. The vertical position tests were done using vertical Japanese text. The test DCP was created by a postproduction house in Japan. They also sent me photographs of the projected output. The tests wer...
by HaroldHallikainen
Sun Dec 11, 2022 2:05 am
Forum: DCP-o-matic
Topic: Vertical positioning of subtitles & SMPTE standard versions
Replies: 10
Views: 2006

Re: Vertical positioning of subtitles & SMPTE standard versions

Yes, a mess, especially for vertical text. I think all that can be done right now is to define a safe area for subtitles to ensure they do not go off the screen. As Carl points out, bottom align will have a smaller error since the distance from the horizontal baseline to the bottom of the bounding b...
by HaroldHallikainen
Sat Dec 10, 2022 7:03 pm
Forum: DCP-o-matic
Topic: Vertical positioning of subtitles & SMPTE standard versions
Replies: 10
Views: 2006

Re: Vertical positioning of subtitles & SMPTE standard versions

This is a problem. I was chair of the subtitling committee trying to improve the rendering of Japanese subtitles. As pointed out, there are differences in the vertical position specification in the two versions. We ran extensive tests and found only one server used the 2014 version for vertical posi...
by HaroldHallikainen
Sun Nov 20, 2022 2:36 am
Forum: DCP-o-matic
Topic: Italic Subtitles getting Croped?
Replies: 5
Views: 569

Re: Italic Subtitles getting Croped?

SMPTE ST 428-7 says to convert to italic by skewing the string to the right (I think it is 7 degrees). In tests, most, if not all, systems skewed the string about the horizontal baseline. Ascenders will move to the right and descenders will move to the left making the string slightly longer.

Harold
by HaroldHallikainen
Thu Oct 13, 2022 9:51 pm
Forum: DCP-o-matic
Topic: Adding closed captioning using a .srt file
Replies: 10
Views: 2338

Re: Adding closed captioning using a .srt file

If you run the latest IRC-28C firmware ( 200601 at http://ftp.uslinc.com/Products/IRC-28/Software/Firmware/beta/ ), you can view a log of the interaction with the DSS-200 on the IRC-28C web interface. You should see the IRC-28C connect to the DSS-200. You should see an announce request and a lease r...
by HaroldHallikainen
Mon Oct 18, 2021 12:57 am
Forum: DCP-o-matic
Topic: CC lines showing in reverse order.
Replies: 5
Views: 6317

Re: CC lines showing in reverse order.

The Valign and Vposition values for the Text elements look correct, but as pointed out in the ISDCF document, some systems require the top line of text to be the first Text element. Here it is the bottom. That complies with SMPTE ST 428-7, but does not work properly on this system.

Harold