When attempting to transcode Multicorder files encoded with the vMix AVI codec to ProRes, the vMix Media Converter shows the 'Audio Format Not Supported' error message and doesn't process the video. The files were recorded with 32 bit float audio, matching the system settings for the project which was transmitting all audio to a QL1 mixing desk over Dante.

The recordings are VFX test recordings of 4 cameras in a green-screen studio and so the audio track is not actually important at all. Is there a way to force the vMix Media Converter to ignore the audio tracks, or a way to strip the audio tracks from the AVI files before processing? I have FFMPEG installed on the vMix machine but it doesn't recognise the vMix AVI codec, so attempting to copy the AVI file using the -an option to strip the audio results in a file which shows as invalid in vMix Media Converter.

If there are any other tools or approaches that might enable me to use these files, I would be grateful for any pointers...