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Author Topic: dcp specification Allan Riddelll Film Handler Posts: 33 From: msida , malta, europe Registered: Jan 2009 posted 03-23-2015 09:48 AM                     Recently it was decided to transfer our pre show advertising from DVD to DCP. After ingesting the DCP successfully onto the Doremi server, it was found that sound and picture were playing far too slow despite a transfer of 24 FPS which I understood to be the appropriate frame rate. Can anyone supply the appropriate specs for sound and picture.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 03-23-2015 10:10 AM                     Which software did you use for the conversion and what format (codec, origin) was your source footage? - Carsten  |  IP: Logged Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 03-23-2015 10:31 AM                        Most likely, your preshow was created at a higher frame rate like 30 so a 24 frame rate DCP will play too slowly. You need to create the DCP at the same frame rate as the origin footage. Just make sure your projector will play that frame rate.  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 03-23-2015 10:47 AM                     There's a difference between rendering a DCP at 24fps, and transcoding or re-sampling video from some other frame rate to 24fps. I don't know what television standard is used in Malta, but here in the US we use NTSC at 30fps. If I simply tell the DCP program to output at 24fps it will simply slow down the video & audio playback from 30 to 24fps , which sounds like what is happening to you. What first has to be done is that the video & audio have to be run through a program or an electronic frame rate conversion system which will re-sample and do some sort of digital interpolation to properly convert your frame rate to 24fps, and then render the DCP at that rate. >>>But- - do you REALLY need to do this?<<< Using my USA NTSC/30fps frame rate as an example- 30fps is a valid DCP frame rate. It's not the "standard" DCP distribution specification, but I've only encountered ONE system in the past two years that was 'locked' to 24fps and would not play back 30fps DCP's. Valid DCP frame rates are 24, 25, 30 & 48fps Almost all systems can play these. So if you are just doing this for yourself, or your own theater, there's really no reason I can see why you can't just encode your video at whatever frame rate works for you, on your own system. I do this all the time, with no problems, with theatres that I'm directly involved with. But, if you are encoding something for general distribution, you really must do some sort of 'frame rate interpolation conversion' to 24fps to meet the DCP specs and assure 100% compatibility and interoperability with all DCP systems everywhere in the universe.  |  IP: Logged Fernando Caldeira Film Handler Posts: 45 From: Lisbon , Portugal Registered: Mar 2010 posted 03-24-2015 07:29 PM                        Just use DCP-o-matic and all all problems will go away...  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 03-24-2015 08:48 PM                     +1 For "DCP-O-Matic" I have to create 10, 30 sec spots, which the source is in MP4 format to target them as DCP content, using the program above, to use with our system. -Monte  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 03-25-2015 05:17 PM                     Dolby DSS/DSP 100 will not do 25 or 30 fps in jpeg 2000 but will in the older mpeg2 format.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 03-25-2015 06:05 PM                     Even DCP-o-matic can't solve the issue of 30fps->24fps conversion... Yes, it will create a 24fps, but slowed down. Better to check if your machine supports 30fps (use SMPTE packaging), and leave it at 30fps (or whatever the native framerate of your source footage is, as long as it is any of the supported rates). - Carsten  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 03-25-2015 06:49 PM                     what about using handbrake to do the frame rate conversion  |  IP: Logged Grant Chambers Film Handler Posts: 29 From: Branson Missouri, USA Registered: Jul 2012 posted 03-25-2015 11:08 PM                     I use After Effects to convert the frame rate, then export as tiff sequence 16 bit. Then render the sequence in open DCP to jpeg2000, etc, etc. Never had an issue.  |  IP: Logged

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