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flashes on frame rate changes

Posted: Sat May 18, 2019 1:00 pm
by marcelmax
Hi,

when screening short film playlists with DCPs created by DOM in a cinema we notice short flashes at the moment the frame rate switches i.e. from 24 to 25. DCP A wit 24 fps ends - short flash - DCP B with 25 fps starts (or vice versus).
Of course we do not know if it's a DOM issue, but: Has anyone an idea how to solve?

Thanks!
Marcel

Re: flashes on frame rate changes

Posted: Sat May 18, 2019 7:29 pm
by Carsten
Some servers do that, some not. Typically, it's a 24/25 fps issue. Is this a Dolby DSS server?

You can try to put short server blacks between CPLs, or do short dowser close/opens to mask the flashing.

Another option would be to conform all CPLs in a program block to the same frame rate with DCP-o-matic.

- Carsten

Re: flashes on frame rate changes

Posted: Mon May 20, 2019 12:03 pm
by marcelmax
Hi,

thanks!

"Another option would be to conform all CPLs in a program block to the same frame rate with DCP-o-matic."

What does happen with different frame rates in this case? Speed change?

Thanks!
Marcel

Re: flashes on frame rate changes

Posted: Mon May 20, 2019 10:01 pm
by carl
Speed change, indeed.