ffmpeg – overlay
copy metadata from m4a to mp3 | ogg
ls *.m4a | while read line; do out=`echo $line|cut -d”.” -f1`; ffmpeg -i “$line” -ab 192k -ar 44100 -y “$out.mp3” -map_meta_data 0:0 ;done
overlay logo
ffmpeg -i IMG_0247.MOV -vf “movie=wm.png [logo]; [in][logo] overlay=10:10 [out]” -y out.mov