notes/linux/ffmpeg.md

Duplicate DTS and encode AAC

ffmpeg -y -i <input> -strict -2 -map 0 -c copy -map 0:a0 -c:a:1 aac -b:a 192k -ac 2 -f matroska <out>

Attach Cover Art

function addcover(){
ffmpeg -i $1.mkv -map 0 -c copy \
       -attach $1-poster.jpg -metadata:s:t mimetype=image/jpeg -metadata:s:t filename=cover.jpg \
       -attach $1-fanart.jpg -metadata:s:t mimetype=image/jpeg -metadata:s:t filename=fanart.jpg \
       $1.plus.mkv
}

Note: gerbera doesn't read the jpg. :( Why?