DeckLink device memory and frame capture serialization

Hi,

Reading the documentation, it is unclear whether the VideoInputFrameArrived() provides device-memory- or host-memory-allocated video frames. My understanding is that they are stored on the device, since storing more than 25 UHD frames without releasing them seem to break my app. Please correct me if I'm wrong.

Since keeping 25 frames is not possible, I now plan to release every incoming frame to free device memory.
What I would achieve then is to serialize incoming frames into host memory, so I can Release() them up as they come along, and in the end deserialize them from host-memory back to the device memory for playback.
Is there any way to achieve this easily using the API? I am expecting something like:

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IDeckLinkInput::SaveVideoFrame(IDeckLinkVideoInputFrame *videoFrame, IDeckLinkHostVideoFrame ** hostFrame)
IDeckLinkOutput::RestoreVideoFrame(IDeckLinkHostVideoFrame *hostFrame, IDeckLinkVideoInputFrame ** videoFrame)


If no, I guess I have to serialize/deserialize by myself.
The idea then is to fetch all data from the IDeckLinkVideoInputFrame with:

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GetPixelFormat
GetFlags
GetBytes
GetTimecode
GetAncillaryData


and then store all these data into host memory, and release the frame.
Later, when we will need to playout the frame, one can create a IDeckLinkMutableVideoFrame instance and set all the data with:

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SetFlags
SetTimecode
SetTimecodeFromComponents
SetAncillaryData
SetTimecodeUserBits


Since the documentation is as vague as for video frames, my question is does the GetAncillaryData() method also provide a pointer to device-memory ancillary data?
If yes, i.e. if objects are not stored into host memory, how to get out of this?

Thanks,
Tim