Recebi a resposta de Nicholas Gill (no fórum do Blackmagic ):
Hi Mitra,
It is possible to set the 'last-frame-shown' (Idle Output) setting from the DeckLink API.
First query the BMDDeckLinkSupportsIdleOutput attribute 1 via the IDeckLinkAttributes interface [2] to determine if the device supports idle output.
If supported, set the bmdDeckLinkConfigVideoOutputIdleOperation [3] configuration item via IDeckLinkConfiguration [4] to the desired idle setting - BMDIdleVideoOutputOperation [5].
Please note the comment in [4], WriteConfigurationToPreferences must be called if the application wants to save the configuration changes, otherwise any changes made will be reverted when the IDeckLinkConfiguration object is released.
Cheers,
-nick
1 2.7.17 DeckLink Attribute ID [2] 2.5.17 IDeckLinkAttributes Interface [3] 2.7.18 DeckLink Configuration ID [4] 2.5.15 IDeckLinkConfiguration Interface [5] 2.7.41 Idle Video Output Operation BMDIdleVideoOutputOperation enumerates the possible output modes when idle. bmdIdleVideoOutputBlack When not playing video, the device will output black frames. bmdIdleVideoOutputLastFrame When not playing video, the device will output the last frame played.