Subtitles start in sync but as film progresses stat to lag progresivly behind

[funkytwig]

Is this that they were created in the wrong frame rate? Can these be changes in DCP-O-Matic/the file or do they need to be recreated?

[carl]

That's the most likely reason. DCP-o-matic will assume that they were created for the frame rate of the video that they are alongside. If that's not the case you need to right-click on the subtitle file, choose "Advanced settings..." and set "video frame rate that the content was prepared for" to the right value.

[funkytwig]

Wow, thanks, that was quick I set it to 23.976 and it worked. Thanks. Does this mean the set file was created at 23.976?

[carl]

Either that or something else is going wrong!

[Carsten]

Where does this subtitle file come from? Masters from not strictly cinematic cameras are often 23.976fps.