Interleave a sequence of top/bottom fields

[Searles, Dan]

I've having trouble coming up with a pipeline for a v4l2 source that produces (at 60 buffers per second) a sequence of alternating top/bottom NTSC 240 line fields, that I want to then combine into 480 line frames, also at 60 per second. Each in coming field should just replace its previous data, and emit a new frame.

I'm using version 1.8.3.

Is this possible?
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