题: Does it support 1080PI 50 输入?

回答: 是, 它支持.

COFDM-904T supports 1080p 50
1080P 50 英寸 TFT 备份监视器 TM-7003A 用于
COFDM-904T 1080P 50 receiver
1080P 50Hz monitor receiving (Please check the below video link or below youtube link)
https://youtu.be/bbX8exaUu0M

题: Does COFDM-904T have an audio transmission function?

回答: If the audio from HDMI, then it supports, it does not support CVBS audio input, only have CVBS video input (黄色). Please check the below video.
https://youtu.be/-2ine7z1a70