Speaking of silly mistakes, I was backing up some Cantonese DVDs for Clara and wondered why the resulting files were way larger than I expected.
$ ls -lh *mkv ==> 653M Forensic Heroes - s01e07.mkv ==> 692M Forensic Heroes - s01e08.mkv ==> 953M Forensic Heroes - s01e09.mkv $ mkvinfo *s01e09* ==> [..] ==> | + Track ==> | + Track number: 2 (track ID for mkvmerge & mkvextract: 1) ==> | + Track UID: 2 ==> | + Lacing flag: 0 ==> | + Name: Stereo ==> | + Language: chi ==> | + Codec ID: A_AC3 ==> | + Track type: audio ==> | + Audio track ==> | + Channels: 2 ==> | + Sampling frequency: 48000.0
Whoops! I did AC3 passthrough, instead of transcoding. I must have been looking at my LaserDisc demodulator before I ran that.