Comment 4 for bug 511194

This seems to be a small issue with the vorbis encoder only accepting 32-bit wide audio streams (for some reason I had thought it was 8-24).

The new release should have this issue fixed. For a quick fix on your end you can make sure the width is set to 8, 32 in the preset file in /usr/share/arista/presets/, use a different preset, or update to the latest version that was released this weekend.