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Author Topic: Subtitle problem Brenard Cabiles Jr. Film Handler Posts: 9 From: DUBAI, UNITED ARAB EMIRATES Registered: Feb 2013 posted 11-18-2013 01:13 AM                     Hello Everyone, i have gone through the comments so i just sneaked in as i think my situation is relevant to the topic. i have had the similar issue with subtitles when playing 4K content with 4K PNGs on all our systems as it is BIGGER than the usual when projecting the image on the screen. the solution we did is to ask the movie distributor to send us a 2K PNGs to correct the issue. but i dont want to do this all the time whenever we have 4K content. can you advise on how to correct this issue? will appreciate your comments. thanks, Brenard  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 11-18-2013 07:46 AM                        This is being discussed within SMPTE for SMPTE timed text files (which are not yet being shipped - We're still on Interop Cinecanvas). For SMPTE, the PNGs are supposed to be designed for direct usage on the main picture. If the main picture is 4k, and the projector scales it down to 2k, the PNGs also need to be scaled down. I'll have to dig out my copy of Cinecanvas to see how it is supposed to behave. Harold  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 11-18-2013 03:51 PM                     If you do...give a copy to TI...they don't seem to know how it is supposed to behave either.  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 11-18-2013 08:31 PM                        In a quick review of the CineCanvas spec, I'm not seeing anything about PNG resolution. I think the issue is coming upwhen the subtitles are projector rendered and the server scaled 4k main picture to 2k before sending it to the projector. The server did not rescale the pngs, and the projector does not know this was originally 4k (if it did know, could it scale the pngs, or would the server need to do it?). So, it appears the mainpicture is getting scaled, butthe pngs are not. Harold  |  IP: Logged Peter Maddock Film Handler Posts: 19 From: Benalla, Victoria, Australia Registered: May 2013 posted 12-30-2013 11:53 AM                    Interesting topic on subtitle problems. I have previously posted on a different issue with subtitles projecting up to three minutes too early with some features played in our normal playlist including advertising and trailers. When this happens I split the show and play the feature on its own which times the subtitles correctly. We have a Barco DP2K 10s and Dolby DSS220 Player and IMB. The installer is waiting on an update from Dolby to correct the problem. Looks like we might need to check on updates for the ICP as well! We have also experienced problems with subtitles being below the bottom of the image on scope. I put this down to the subtitles being "subsumed" which had also occurred with some ecinema files we played some time ago. So if there are two lines in the subtitle the bottom line appears below the bottom of the scope image, in some cases. In these situations we leave the bottom mask down. We have had this happen with ecinema (.mpg) and dcinema (DCP). In our cinema we cannot zoom out fully for scope so we normally lift the bottom mask up to the scope image.  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 12-30-2013 12:02 PM                        I know there have been closed caption and probably subtitle timing issues if you mix frame rates (includind 3D) in a play list. You can look at the Resource Presentation List that is used by both captions and subtitles and see that the timeline offset for reels after the different frame rate reel is wrong. Dolby builds a single RPL for the entire show. Doremi does one for each composition, avoidingvthis issue since a composition is all the same frame rate. GDC did do one RPL per show, but recently changed to one RPL per composition. Your "show splitting" is a good workaround for now. Harold  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 12-30-2013 12:51 PM                     Dolby 4.7.0.42 is available now and does address subtitles with different frame-rate CPLs.  |  IP: Logged

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