No Audio in the stream
1. possibility:
Maybe Encoder does not detect the Audio input. Then, please connect the source to a Monitor/TV set to check whether both Video & Audio is ok.
2. possibility:
Maybe the source device output a "special" audio format and then Encoder does not recognize. For example, the frequently seen audio format is 48khz, 44.1khz, 32khz.
3. possibility:
"Encode" error. Then, maybe we can have a try reboot Encoder and then restart to "encode".