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OpenDCP / Re: Sound in and out of sync with Sony projectors
« Last post by Terrence Meiczinger on May 24, 2017, 09:35:03 AM »
I seem to recall (from a few years ago) the standard JPEG2000 export in Resolve does not use EasyDCP and is not DCI compliant. This may not be the case anymore, but something to consider.
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OpenDCP / Re: Sound in and out of sync with Sony projectors
« Last post by rconnew on May 24, 2017, 01:39:59 AM »
Thanks I'd just assumed a maximum of 250mbs as the limit. The sound did seem to be ahead of the picture so possibly it was taking longer to process the picture. The projectors are supposed to be the latest having been updated last year see https://www.sony.co.uk/pro/press/pr-sony-4k-projectors-at-vue-entertainment
The footage is 10bit with some really extensive colour grading and as such what I didn't want to see was blocky bits on the screen by compressing it too much so that's why I went for 230. I did notice the picture stop go black at one part then restart so you may very well have a good point. May even be slow disks on the server? I'll go for 50% and try 125 and see if that works. Picture was really really good no artefacts or banding anywhere not even in very dark scenes so I wouldn't want to introduce it now. Others have used Resolve successfully for DCP's (and it does have easy dcp built in but at a cost!) so I'm fairly sure that isn't the issue and it makes the process a lot quicker plus I'm more sure about the colours being right as that was where the film was graded.
Much appreciated.

Richard
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OpenDCP / Re: Sound in and out of sync with Sony projectors
« Last post by Terrence Meiczinger on May 23, 2017, 04:32:32 PM »
1. Do you know the make/model of the digital server?
2. Your bandwidth is way higher than you need and some servers (especially older DoRemi's) can have issues with that. You only need around 75mb/s for 2K 24fps. This is the most common source of sync issues that I have seen.
3. DaVinci Resolve may not be creating DCI compliant J2K images.
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OpenDCP / Sound in and out of sync with Sony projectors
« Last post by rconnew on May 23, 2017, 01:24:42 PM »
Folks,
         New ish to DCP's so not entirely sure what I'm doing is right so if anyone could please give me some pointers I'd really appreciate it.

We have an 80 min feature film we made that we are going to premiere in the local VUE cinema at the end of June. To be on the safe side I took a test DCP down today to test it and then I have time to fix any problems. Good news is the picture is perfect, bad news is the sound starts off in sync and then gets more and more out of sync over time. If the film is stopped and restarted at another point in the film it returns to being in sync again and then slowly gets worse. This happens every time you restart it at any different points including start and stop at the same point.

Obvious one was different frame rates but I have double checked and both are 24 plus if one was 23 and one 24 then surely the sync would be out all the way through? Plus the frames would be different numbers on DCP creation as well?

DCP was created as follows
1. Film into DaVinchi Resolve project then output as J2000 files in 2K flat at 230mbs.
2. Use OPEN DCP to create MXF file SMPTE from J2000 files
3. Export from 24fps project in Premiere uncompressed 5.1 wav file
4. Open wav file in Adobe Audition and split into separate 5.1 files
5. Import Right, left, centre etc etc into OPEN DCP and create SMPTE 5.1 MXF sound file
6. Add sound and video MXF files into OPEN DCP and create DCP

When tested on a PC via stereoscopic player (can view and playback dcps as well as 3D) sound in sync and all works well?


Tried the staff at VUE for help or ideas but it seems they only load the films and press buttons these days which isn't much help. The only thing I can think of is to create an MXF Interop DCP and see if with more tolerance that's any better? Anyone any other ideas please? Anything I've not allowed for or forgotten?
Appreciate any help, Thanks

Richard
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OpenDCP / Re: add xml digital signatures
« Last post by Terrence Meiczinger on May 15, 2017, 02:12:18 PM »
It allows the server to validate the integrity of the DCP and the identity of the creator. In most cases, especially when not using KDMs it is unnecessary.
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OpenDCP / add xml digital signatures
« Last post by dcpCA55 on May 12, 2017, 08:48:23 AM »
Hello,

Simple question.. just trying to figure out what 'add xml digital signatures' does?  Is that something that is recommended to turn on for basic DCP's?  Which makes is more likely that there won't be any issues with playback or ingest?

I did some google searching.. but couldn't really find a clear answer.

quick side question... what do people normally do for the 'Names, annotation, etc' fields when making the DCP. Are all those optional and won't effect DCP checks or ingest?

thanks much!

Peter
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OpenDCP / Re: openDCP crashes
« Last post by hdvprojection on May 10, 2017, 02:17:32 PM »
I forgot to follow up on this in-thread. Adding the switch "-depth 8" in the mogrify command resolves this issue. For example:
Code: [Select]
mogrify -background black -gravity center -depth 8 -extent 1998x1080 *.tiffThanks for your help Terrence.
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Digital Cinema Packages / 7.1 Channel Mapping - Feature Request
« Last post by hdvprojection on April 26, 2017, 01:56:04 PM »
Terrence,

Can the next version of OpenDCP either place the rear surrounds on channels 11 and 12 by default (with mutes in 7 through 10) or give the user the option to decide where these channels should go? I realize that there is evidently no effective "standard" for this beyond the first six channels, but the recommendation from Dolby and others is to have HI/VI in channels 7 and 8. Indeed, most theaters' sound systems are set up to expect the Dolby-recommended layout, and 7.1 DCPs created on OpenDCP do not play properly without some tinkering. Thanks.
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Digital Cinema Packages / Re: Audio Format Metadata
« Last post by hdvprojection on April 25, 2017, 07:48:38 PM »
I have some clarification: firstly, in case there was any confusion, ingest and Playback are not a problem. These are fully functioning DCPs. Secondly, the issues we are seeing seem to reside mostly at the TMS/LMS level. Some of these systems, like the Hollywood Software TCC3, fetch higher-level playback instructions from the CPL (higher than, say, first and last frame.) Among these is the audio format.

So, when the theater staff is composing their feature SPL, and this playlist contains DCPs of differing audio formats, the TCC3 will automatically place the appropriate format cues wherever needed.

I suppose, then, what we're really discussing here is a feature request. Can writing these optional parameters to the CPL be included in a future version of opendcp? Thanks.
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Digital Cinema Packages / Re: Audio Format Metadata
« Last post by Terrence Meiczinger on April 24, 2017, 11:02:36 PM »
SMPTE 429-16:2014 is about OPTIONAL metadata intended for human readable consumption. This is for content management purposes, allowing sorting, searching, filtering, cataloging, etc. In the future, it will reduce the role of the Digital Cinema Naming Convention. The server does not use it to determine the number of channels in the audio format. The truth is in the MXF file and that is what the server will use. Check your MXF files in EasyDCP Player. It may be there is an issue with the MXF file and some servers can deal with it, but the newer ones are more strict about it. There could be a bug in OpenDCP or the server itself. It wouldn't be the first time for either. Unfortunately, without access or testing time on an 850 or debug logs, there isn't much to go on. If you can get more information, that would be helpful.
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