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The practical limitation of the chipset when used in 2 channel mode is 20mbit total for both channels
I year ago we were testing A7LA70D 2ch 1080p with custom 15 + 15Mbps, - it was nice clear picture but unfortunately too high bit-rate caused other bugs. Developer went back to 10 + 10Mbps, which proved to be practical limitation for one A7 running 2ch FullHD as you mentioned.
Same with TI chipset used on Blacksys, combined bit-rate is 18Mbps ( 14 + 4 ) which is practical limitation for this solution to run smoothly and be reliable.
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