ST2110OutputVideoSenderAdvanced.frameBufferSize property

Number of frame buffers MTL keeps in flight for this sender — a count, not a byte size. Larger gives more cushion against PS-side pacing jitter at the cost of one frame’s-worth of memory per slot and matching latency between PS push and wire emission. Bounded by MTL’s ST20_FB_MAX_COUNT (8); defaults to 2 (each slot is megabytes for raw video, so the default keeps memory low).

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