HDMI audio encoding from Gopro camera

[johngoforth]

Hi folks, I use HDMI direct output from GoPro for streaming application. Here is the deal - I use this HDMI to RF modulator, so I can stream video to 10 TV sets, H264 encoding gives me resolution up to 1080p@60, but when I use it - audio dissapers, audio works only when I apply MPEG-2, but video quality decreaces. For audio I tried AC3 and AC3 HDMI passthrough - no difference What could be the problem?? Thank you!