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I have looked at several options such as IP camera encoders, digital signage encoders, etc.
One that stands out, largely due to availability and cost, is the VBrick encoder/decoder. This unit outputs MPEG2 or MPEG4, Windows Media, H.264, and some other standards in both SD and HD. They are also in industrial enclosures therefore robust enough to survive repeater buildings.
What capabilities would such a device require?