Feature request: Prevent muxing file without audio track selected
From time to time, I'll accidentally process a foreign film and forget that it automatically selects only English audio tracks, which results in a video with no audio, which means I have to do it again. There are two possible solutions to this: an option could be added to automatically select an audio file if it's the only one, regardless of language, or an option could be added to warn when no audio track is selected.