Example methods and apparatus for adaptive video transmission based on channel capacity are disclosed. A first wireless display source device for adaptive video transmission based on channel capacity includes a video bit rate determiner, a comparer and a video bit rate setter. The video bit rate determiner is to determine a collective video bit rate based on a current number of wireless display connections in a peer-to-peer (P2P) group multiplied by a current video bit rate of the first wireless display source device. The P2P group includes a second wireless display source device in proximity to the first wireless display source device. The comparer is to compare the collective video bit rate to a wireless display capacity in proximity to the first wireless display source device. The video bit rate setter is to set the current video bit rate of the first wireless display source device to a first adjusted video bit rate value in response to the comparer determining that the collective video bit rate is greater than the wireless display capacity, and to set the current video bit rate of the first wireless display source device to a second adjusted video bit rate value in response to the comparer determining that the collective video bit rate is not greater than the wireless display capacity.