Hi,
Errors are usually displayed on the screen in red. There could be a syntax error, a codec issue, or other problem. Please note that the EMS requires inbound streams to be in H.264/AAC format. If not, transcoding will be required to convert your source stream into H.264/AAC format. Please see the EMS User Guide for details on transcoding.
You may also provide the command & parameters you used, the relevant log files, and the configuration file, config.lua, so that we can look into it in detail.
Cheers,
Don