To get 1080p video resolution on Chromecast:
Cast Device Hardware and minimum requirements:
- Chromecast 2nd Generation and up
- Chromecast device is directly connected to power outlet using Chromecast dongle power cable
- Chromecast firmware is up to date (to check firmware version follow steps: https://support.google.com/chromecast/answer/7124014?hl=en&ref_topic=3447927)
- Chromecast device must be connected directly to the HDMI port
Home Network set up and minimum requirements:
- Chromecast should be close to the modem if possible for the best connection and performance
- Wifi home network speed at minimum = 6mbps (more needed if internet is being consumed by additional devices)