11. The system of claim 1 , wherein the resolution transcoding sub-system comprises: a resolution determination module configured to: receive the source video having a first video format and a first resolution; obtain a video coding complexity score of the source video; determine a second resolution of the source video based on the video coding complexity; and an adaptive video encoder configured to encode the source video into an output video having the second resolution and a predetermined video output format.
11. The system of claim 1 , wherein the resolution transcoding sub-system comprises: a resolution determination module configured to: receive the source video having a first video format and a first resolution; obtain a video coding complexity score of the source video; determine a second resolution of the source video based on the video coding complexity; and an adaptive video encoder configured to encode the source video into an output video having the second resolution and a predetermined video output format. 12. The system of claim 11 , wherein the adaptive video encoder is further configured to encode the source video into an intermediate video having an intermediate video format.