How to use 2 variable for "for" statement in Shell Script

Question

I want to use f and v for variable. f *.mkv and v *.mp3

for f in *.mkv v in *.mp3; do 
   ffmpeg -i "$f" -i "$v" -vcodec copy merge_"$f"
done

I dont know how to do it properly. I am still new with bash shell scripting.

I hope someone can help me.

Answer 1

If the *.mp3 and *.mkv basenames are the same:

for f in *.mkv; do
    mp3name="${f%.mkv}.mp3"
    ffmpeg -i "$f" -i "$mp3name" -vcodec copy "merge_${f}"
done