Using MPEG4 recorder as audio recorder without video input

[7tronics]

Any suggestions on how to use the OSD MPEG4 recorder to record audio only? When connected without video input, the recorder simply fails and pops up an error message. Any parameters I can change from the CLI to allow recording without video input? I've searched the forums and don't see a related tip.

Initially using the OSD as a DAR at our church, then looking to input a frame at a time (perhaps changing every few minutes). Not sure when any streaming is going to be of interest here.

Should I put a stub on the video input to the OSD? (Will have to make one, perhaps have a BNC 50ohm stub somewhere in my junk box that I can modify to approximate 75ohm load...)

Cheers de Mark at 7tronics