Both of those things are true. But if you want to make a single new file with just one audio track, don’t use tsmuxer - use mkvtoolnix. Same idea, uncheck all the tracks you don’t want, but it’ll spit out a new, muxed MKV file at the end instead of splitting it into individual video and audio files.
Haha, well, I just got tsmuser up and running (thanks again) but looks like mkvtoolnix is probably better for my immediate purposes. I’m a bit confused as to how tsmuxer differs. Is it better suited to extracting video content only?
Sorry to pick your brains, but you obviously have a good handle on this.