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Seems to be because we're tring to add one video frame to a DCPTime and this isn't integer at 18fps. The two branches try to increase the timebase, or use a custom timebase per DCPTime. Both seem quite involved. |
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OP says 18fps is allowed in for DCPs but I can't find anything to suggest that. |
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SMPTE ST 428-21 specifies 200/11 ~ 18.18 fps (ST 428-21:2011, Archive Frame Rates for D-Cinema, https://doi.org/10.5594/SMPTE.ST428-21.2011) Screenshot 2024-12-22 at 01.26.48.jpg (176,101 bytes) Screenshot 2024-12-22 at 01.27.04.jpg (122,898 bytes) |
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I am not aware of any hardware support for this though.. maybe that has changed? |
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What does "archive" mean here? Is any actual installed system supposed to play 200/11 DCPs? |
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It refers to films held in film archives, or rather digital restorations of those films. Silent films are often made to be projected in frame rates below 24 fps. 16 and 18 fps are the most common. |
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And yes, I believe that systems are supposed to play these DCP:s. Yet there seems like very few manufacturer have bothered to implement it.. CineAsset Mastering Suite seems to have implemented support in 2014: https://www.dcinematoday.com/dc/pr?newsID=3554 There is some discussion about this in the Journal of Film Preservation, issue 0000104, April 2021 (page 32): https://www.calameo.com/fiaf/books/000918540dc6cb729643b |
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Thanks for the information. I'll look into a fix for this. |
- Anonymous
