DCP on some servers (setups) out of sync?

[Eric Sebalsky]

it plays fine in any software player (easyDCP etc) and is perfectly in-sync. as are the source files. all 24p SMPTE. on the DOREMI servers i’ve tested it (with dolby for sound) all is right as well. but for example on a SONY server i get about 6 frames of audio delay and also on some other non-doremi brands. this must be a decoding problem or the audio server introducing a delay, right?

how come, other films play back just fine?

is there a reliable tool to tripple check the package on mac?

if it plays back well on one server (pretty high end cinema) it should not be a problem of the DCP, right?

i do know the problem from some BLURAY setups, where multiple preprocessors are linked together to upscale or compensate and introduce a delay this way (for example when the player cannot handle a 24p disk and upscales to 60i). setting everything to 24p manually usually helps.

i have not change the way i’m making DCPs. i convert them in DCP-o-matic and stick them together with openDCP (for example if i have to switch the audio to another dubbed language). after all, the package validates.

any input on that? thank you!

[Yuri Mamaev]

Eric,

Could you, please, send me a link to DCP you have problem with, so I’ll inspect it on a couple of servers and try to get the idea what’s happening. Have you tried to create a DCP just directly with OpenDCP?

Which servers do you have issues on (and processors)?

Best regards,

Yuri Mamaev

31 июля 2014 г., в 13:25, Eric Sebalsky <seb.l...@gmail.com> написал(а):

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[Eric Sebalsky]

Hi!

Thanks for the quick response. The situation is as follows: the film is already playing and having its release in germany. we did test of course and could not reproduce the problem that is now occuring.

i do not have the film online anywhere. it’s a 80GB package. but thanks for the offer.

in the past i’ve created DCPs directly in openDCP but it is a way slower process due to 2 encoding stages. since DCP-o-matic borrowed he same encoding algorithm from openDCP i figured it should be fine (as long as everything is either interop or smpte and not mixed). i also had no problems with it for other projects.

i have to dig deeper and ask the cinemas having problems about their exact setup. a tedious process as you can imagine. let me come back to you with more details hopefully soon.

[Yuri Mamaev]

Hi,

80 GiB is not a big deal ;)

Tthere were a couple of issues with Doremi IMS-1000 on version shipped until I suppose March 2014 with floating audio delay on several packages, very unstable bug. It could be, that you're experiencing the same...

You can ask for diagnostics packages / log files / etc from these cinemas.

DCP-o-matic should be fine, I think too, but it's good way to understand the cause by splitting the potential ones.

Best regards,

Yuri Mamaev

31 июля 2014 г., в 13:39, Eric Sebalsky <seb.l...@gmail.com> написал(а):

[Eric Sebalsky]

on doremi (+ dolby processor) everything is fine. it plays how it was intended to.
so far we had the problem on two sony servers (audio processors unknown unfortunately)

[The Comedy Cartel]

Hi Eric,

I just wondered if you ever got to the bottom of this issue? We have a lag in our Audio from our DCP for the first two minutes in one specific cinema and the same DCP plays fine elsewhere. Was yours the whole way though? I'd be very interested to know

Ben

[SL film]

hi there! unfortunately no news on that front. if you stick to the maximum legacy settings of a DCP (interOP on an EXT2 drive) it's mostly fine.
but even then we had some minor sync problems in some cinemas on specific servers. funny thing is: also the some blurays lag in those cinemas. so it must be a setup thing in the wiring.
for us the audio was out of sync for about 4 frames all the time. exactly the amount you can adjust on a DCP server for setup lags. but other DCPs worked fine.
sorry to not be of more service. it could still be a problem of drive formatting. because if i let a company make all the copies from my master the problems nearly go away completely.
it happened with NTFS and EXT2 drives. even when made on linux in the right inode size.

[Manuel Weber]

FYI on the other end:

i measured a lag of about less than a frame as normal in our dolby system. due to the dolby sound processor. 

i measured with raw analog audio input. 

m

Von meinem Dackel gesendet

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