Good point. In an ideal world I guess the display would be representative of the some common CCAP system or other... is there a dominant one? What are its characteristics?

Is there no CCAP system that respects any of the appearance / formatting markup?

I'm pretty much clueless about CCAP as we didn't have them where I used to work.

Harold Hallikainen designs one of the major CCAP systems, he has put some documents together what to expect from a system.
Frankly I am clueless wether the SMPTE documents defining CCAP do deviate from OCAP styles. It may make sense to e.g. support italics on a CCAP display, but according to Harold's document, systems do not support that. Typically, they use their own internal font. Often, because they don't use raster displays, but special character dot matrix displays.

In short, up to three lines, up to 30/32 chars per line.

http://isdcf.com/papers/ISDCF-Doc9-Closed-Caption-Authoring-Best-Practices.pdf
http://isdcf.com/papers/ISDCF-Doc10-Subtitles-and-Captions-in%20Digital-Cinema-20160211.pdf
https://www.qsc.com/resource-files/whitepapers/q_wp_cin_accessibilitybestpractices.pdf

• Carsten

https://interop.cinepedia.com/Addition_To_Document_Release_2.0/ClosedCaption_Interop_2007_11_16_v1_9(clean).pdf

OK it's in a separate window in ded71cffd18962ebb6b9611a5eb6dfafe9e8e4ec

Maybe there's somewhere we can put it in the main window, though perhaps this is a fairly niche thing to spend permenant screen real-estate on.

Yup. A detachable window that displays automatically whenever there is CCAP content?

Yes, a separate window. At the moment it doesn't automatically open, but perhaps it should.

Restrictions/notes from Harold's doc:

• fade ignored
• no overlapping in time
• no PNG
• hposition ignore (but halign may be supported)
• text elements should be in vertical order in the XML; valign and vposition can be used
• valign defaults to centre; valign must be the same within a <Subtitle>
• direction ignored
• LoadFont / italic ignored
• each line of the ccap must be in a <Text>; maximum 3
• limit to 30 chars per line to avoid word-wrap

Maybe create a fixed aspect ratio CCAP window, with an indicator for allowed line length? Could almost look like a VU-Meter - if text expands too far to the right, make it red. Should line length be monitored and hints being given before making the DCP? I guess content analysis could do that? I understand, line-wrapping is allowed, but what if all text elements don't fit onto 3*30? Guess it's okay to leave it to the user in general, but do create a hint.

• Carsten

Hints for overlap and line length / too many lines are in master now. There's an awkward case of subs which are muxed into a video file being used as CCAPs; in that case it may take a long time to fish them out of the video file to check. The hints dialog should cope with this (running the check in the background with a progress meter) but I haven't tested that yet.

I think this is more or less resolved now.

The Player plays the current ISDCF SMPTE Testcontent, incl. open captions with the right timing and position, and including closed captions. Good ;-)