Thu Jan 30, 2020 11:00 pm
Hi Timothee,
SetPreroll is a method in the IDeckLinkDeckControl interface. The preroll is the number of video frames you have scheduled with IDeckLinkOutput::ScheduleVideoFrame prior to starting playback with IDeckLinkOutput::StartScheduledPlayback. The larger the preroll, the less likely for late or dropped frames, particularly if your video pipeline has time variance in providing output frames, but it will increase the overall latency.
By common reference, are you connecting a genlock signal to both the DeckLink SDK 4K reference input, and also your input source?
Regards
Cameron