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Author Topic: Open Caption placement Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 11-12-2016 07:48 PM                     Does it make the data available for all screens in a given complex or does it just do one screen at a time?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 11-13-2016 11:02 AM                     sents the captioning to the ip address of a wifi emitor in the auditorium you want so if you put a seperate one in each room it would do them all  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 11-14-2016 06:25 AM                     Would be interesting to know where they capture that data? For mainstream encrypted DCPs, the subtitle MXF would also be encrypted and they couldn't read it of the DCP files. So they would need to tap it from the projector-server communication at playtime? Then how do they do this for all the systems that do not allow this, e.g. IMS systems? - Carsten  |  IP: Logged Harold Hallikainen Jedi Master Film Handler Posts: 906 From: Denver, CO, USA Registered: Aug 2009 posted 11-14-2016 08:20 AM                        If the system connects to the server on port 4170, the server uses the Auxiliary Content Synchronization Protocol to send information about the captions. It send the URL of the Auxiliary Resource Presentation List. This contains (among other things), the URL for each reel of captions. The captions are transported to the theater encrypted, but are decrypted before the external device fetches the captions (either on ingest or show selection). The content synchronization protocol then tells the external system where the server is in the timeline and whether the content is playing or not. This is typically done by a device in each auditorium, but if a central device has access to all the servers, it could also do it. Putting Wi Fi access points on the auditorium network would seem to raise security concerns. If an external server (like a TMS) could drive a separate network just for captions, that seems a bit safer. Harold  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 11-14-2016 10:21 AM                     Hi Harold - that would apply for closed caption devices. But I think the OP meant open captions, traditional subtitles. There is a connection between the renderer (projector) and server for classic HD-SDI/IMB systems with an external server providing the open captions to the projector at play time. But not for IMS systems? Only closed caption system would need to have that external connection to closed caption display devices? - Carsten  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 11-14-2016 12:15 PM                     quote: Gordon McLeod sents the captioning to the ip address of a wifi emitor in the auditorium you want so if you put a seperate one in each room it would do them all Gord, Well, I was thinking about your idea of a video projector in each auditorium projecting below the screen on a smaller one. I just don't see how that could work in a multiplex unless one does ethernet to video translation. At that point though with aux projector and lamp costs one might as well just use the emitter panel. Mark  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 11-14-2016 01:14 PM                     The idea is to have individual tablets to connect to a specific stream or Wifi to receive it. Of course, if the smartphone or tablet supports HDMI/MHL, you could as well connect it to a projector. For the given reasons, I just don't think it is a universal solution. It would probably work more universal (and that is CDMs main intention) for closed captions. - Carsten  |  IP: Logged

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